Azure99/stackoverflow-qa-top-300k · Datasets at Hugging Face

4,628,290

Pairs from single list

Often enough, I've found the need to process a list by pairs. I was wondering which would be the pythonic and efficient way to do it, and found this on Google: <pre><code>pairs = zip(t[::2], t[1::2]) </code></pre> I thought that was pythonic enough, but after a recent discussion involving <a href="https://stackoverflow.com/questions/4619367/avoid-object-aliasing-in-python/4619575#4619575">idioms versus efficiency</a>, I decided to do some tests: <pre><code>import time from itertools import islice, izip def pairs_1(t): return zip(t[::2], t[1::2]) def pairs_2(t): return izip(t[::2], t[1::2]) def pairs_3(t): return izip(islice(t,None,None,2), islice(t,1,None,2)) A = range(10000) B = xrange(len(A)) def pairs_4(t): # ignore value of t! t = B return izip(islice(t,None,None,2), islice(t,1,None,2)) for f in pairs_1, pairs_2, pairs_3, pairs_4: # time the pairing s = time.time() for i in range(1000): p = f(A) t1 = time.time() - s # time using the pairs s = time.time() for i in range(1000): p = f(A) for a, b in p: pass t2 = time.time() - s print t1, t2, t2-t1 </code></pre> These were the results on my computer: <pre><code>1.48668909073 2.63187503815 1.14518594742 0.105381965637 1.35109519958 1.24571323395 0.00257992744446 1.46182489395 1.45924496651 0.00251388549805 1.70076990128 1.69825601578 </code></pre> If I'm interpreting them correctly, that should mean that the implementation of lists, list indexing, and list slicing in Python is very efficient. It's a result both comforting and unexpected. Is there another, "better" way of traversing a list in pairs? Note that if the list has an odd number of elements then the last one will not be in any of the pairs. Which would be the right way to ensure that all elements are included? I added these two suggestions from the answers to the tests: <pre><code>def pairwise(t): it = iter(t) return izip(it, it) def chunkwise(t, size=2): it = iter(t) return izip(*[it]*size) </code></pre> These are the results: <pre><code>0.00159502029419 1.25745987892 1.25586485863 0.00222492218018 1.23795199394 1.23572707176 </code></pre> <h2>Results so far</h2> Most pythonic and very efficient: <pre><code>pairs = izip(t[::2], t[1::2]) </code></pre> Most efficient and very pythonic: <pre><code>pairs = izip(*[iter(t)]*2) </code></pre> It took me a moment to grok that the first answer uses two iterators while the second uses a single one. To deal with sequences with an odd number of elements, the suggestion has been to augment the original sequence adding one element (<code>None</code>) that gets paired with the previous last element, something that can be achieved with <code>itertools.izip_longest()</code>. <h2>Finally</h2> Note that, in Python 3.x, <code>zip()</code> behaves as <code>itertools.izip()</code>, and <code>itertools.izip()</code> is gone.

4,628,446

10

12

null

2011-01-07 17:20:04.5 UTC

24

2022-02-16 17:25:20.9 UTC

2017-05-23 12:10:02.173 UTC

null

-1

null

545,637

null

1

117

python|list|zip|slice|idioms

78,043

My favorite way to do it: <pre><code>def pairwise(t): it = iter(t) return zip(it,it) # for "pairs" of any length def chunkwise(t, size=2): it = iter(t) return zip(*[it]*size) </code></pre> When you want to pair all elements you obviously might need a fillvalue: <pre><code>from itertools import izip_longest def blockwise(t, size=2, fillvalue=None): it = iter(t) return izip_longest(*[it]*size, fillvalue=fillvalue) </code></pre> With Python 3, <code>itertools.izip</code> is now simply <code>zip</code> .. to work with an older Python, use <pre class="lang-py prettyprint-override"><code>from itertools import izip as zip </code></pre>

4,725,241

What's the difference between Event Listeners & Handlers in Java?

In general terms of java, there are listeners & handlers for events. I mean I use them unknowingly, just whichever is available in the API. My question is, in what case do we use listeners and in what case do we use handlers for events? What's the difference between them? Characteristics?? I've searched for reasons and I couldn't find a proper explanation for Java.

4,725,342

12

1

null

2011-01-18 14:33:00.917 UTC

28

2021-08-20 13:05:47.02 UTC

2014-12-13 09:29:54.91 UTC

null

1,031,939

null

580,082

null

1

87

java|events|listener|handler

95,036

There's no formally defined difference between listeners and handlers. Some people would probably argue that they are interchangeable. To me however, they have slightly different meaning. A listener is an object that subscribes for events from a source. Cf. the <a href="http://en.wikipedia.org/wiki/Observer_pattern" rel="noreferrer">observer pattern</a>. Usually you can have many listeners subscribing for each type of event, and they are added through <code>addXyzListener</code> methods. Example: The <a href="http://docs.oracle.com/javase/7/docs/api/java/awt/event/MouseListener.html" rel="noreferrer"><code>MouseListener</code></a> in the Java API. A handler is an object that is responsible for handling certain events. A typical scenario would be to provide a handler for a specific event/task as an argument to a constructor, or set the handler through a <code>setXyzHandler</code> method. In other words, you usually have one handler for each type of event. Example: The <a href="http://docs.oracle.com/javase/7/docs/api/java/util/logging/MemoryHandler.html" rel="noreferrer"><code>MemoryHandler</code></a> in the Java API.

14,443,808

Java reflection API: Invoking a method without parameters

The method I want to invoke (I know it's public but I need to use reflection): <pre><code>public byte[] myMethod() </code></pre> I get the <code>Method</code> object like this and <code>m</code> contains <code>myMethod()</code> (I checked with the debugger) <pre><code>Method m = Class.forName(MyClass.class.getName()).getDeclaredMethod("myMethod"); </code></pre> Finally I need to invoke m and pass the result to an object: <pre><code>byte[] myBytes = null; m.invoke(myBytes); </code></pre> No exception is thrown but <code>myBytes</code> stays null... I also tried the following without more success: <pre><code>m.invoke(myBytes, (Object[])null); </code></pre> How can I get the result of the invocation to myBytes?

14,443,855

3

0

null

2013-01-21 17:14:16.83 UTC

4

2014-11-30 17:11:34.297 UTC

null

990,616

null

1

24

java|reflection

57,120

<blockquote> No exception is thrown but myBytes stays null </blockquote> Correct, what you wanted there was: <pre><code>byte[] myBytes = (byte[])m.invoke(yourInstance); </code></pre> More in <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/reflect/Method.html#invoke%28java.lang.Object,%20java.lang.Object...%29">the documentation</a>. Notes: <ul> <li>The return value of the method is the return value of <code>invoke</code>.</li> <li>The first argument to <code>invoke</code> is the instance on which to call the method (since you've listed an instance method, not a static method; if it were static, the first argument would be <code>null</code>). You haven't shown a variable referring to the instance anywhere, so I called it <code>yourInstance</code> in the above.</li> </ul>

14,710,061

Is it valid to combine a form POST with a query string?

I know that in most MVC frameworks, for example, both query string params and form params will be made available to the processing code, and usually merged into one set of params (often with POST taking precedence). However, is it a valid thing to do according to the HTTP specification? Say you were to POST to: <pre><code>http://1.2.3.4/MyApplication/Books?bookCode=1234 </code></pre> ... and submit some update like a change to the book name whose book code is 1234, you'd be wanting the processing code to take both the <code>bookCode</code> query string param into account, and the POSTed form params with the updated book information. Is this valid, and is it a good idea?

14,710,450

2

0

null

2013-02-05 14:39:35.983 UTC

8

2019-12-18 16:25:52.787 UTC

null

178,757

null

1

36

http|post|query-string

28,638

<blockquote> Is it valid according HTTP specifications ? </blockquote> <a href="http://www.w3.org/Protocols/rfc2616/rfc2616.html" rel="noreferrer">Yes</a>. Here is the general <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec3.html#sec3.2" rel="noreferrer">syntax of URL as defined in those specs</a> <pre><code>http_URL = "http:" "//" host [ ":" port ] [ abs_path [ "?" query ]] </code></pre> There is no additional constraints on the form of the http_URL. In particular, the <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec9.html#sec9" rel="noreferrer">http method</a> (i.e. POST,GET,PUT,HEAD,...) used don't add any restriction on the http URL format. When using the GET method : the server can consider that the request body is empty. When using the POST method : the server must handle the request body. <blockquote> Is it a good idea ? </blockquote> It depends what you need to do. I suggest you this <a href="http://www.w3.org/2001/tag/doc/whenToUseGet.html" rel="noreferrer">link</a> explaining the ideas behind GET and POST. I can think that in some situation it can be handy to always have some parameters like the user language in the query part of the url.

14,491,906

Changing year in mysql date

I have a bunch of dates in our database stored in the standard mysql date type. How can I covert a year to 2013, regardless of original date. So if a date is 2009-01-01 it would be 2013-01-01, but if it's 2012-01-04, it'd convert to 2013-01-14. I figured it'd be simple and obvious, but I couldn't figure it out =/

14,492,209

5

1

null

2013-01-24 00:29:17.113 UTC

2

2019-06-13 10:29:34.243 UTC

null

193,763

null

1

39

mysql|date

33,399

That's simple: for DATETIME: <pre><code>UPDATE table_name SET date_col=DATE_FORMAT(date_col,'2013-%m-%d %T'); </code></pre> for DATE: <pre><code>UPDATE table_name SET date_col=DATE_FORMAT(date_col,'2013-%m-%d'); </code></pre>

14,612,192

Detecting a cross in an image with OpenCV

I'm trying to detect a shape (a cross) in my input video stream with the help of <a href="http://en.wikipedia.org/wiki/OpenCV" rel="noreferrer">OpenCV</a>. Currently I'm thresholding to get a binary image of my cross which works pretty good. Unfortunately my algorithm to decide whether the extracted blob is a cross or not doesn't perform very good. As you can see in the image below, not all corners are detected under certain perspectives. <img src="https://i.stack.imgur.com/NHLoA.jpg" alt="Enter image description here"> I'm using <code>findContours()</code> and <code>approxPolyDP()</code> to get an approximation of my contour. If I'm detecting 12 corners / vertices in this approximated curve, the blob is assumed to be a cross. Is there any better way to solve this problem? I thought about <a href="http://en.wikipedia.org/wiki/Scale-invariant_feature_transform" rel="noreferrer">SIFT</a>, but the algorithm has to perform in real-time and I read that SIFT is not really suitable for real-time.

14,612,877

2

1

null

2013-01-30 19:33:27.413 UTC

7

2013-10-26 17:32:24.917 UTC

null

411,022

null

1,976,996

null

1

42

c++|opencv|video|feature-detection

8,699

I have a couple of suggestions that might provide some interesting results although I am not certain about either. If the cross is always near the center of your image and always lies on a planar surface you could try to find a homography between the camera and the plane upon which the cross lies. This would enable you to transform a sample image of the cross (at a selection of different in plane rotations) to the coordinate system of the visualized cross. You could then generate templates which you could match to the image. You could do some simple pixel agreement tests to determine if you have a match. Alternatively you could try to train a <a href="http://docs.opencv.org/modules/objdetect/doc/cascade_classification.html?highlight=haar#haar-feature-based-cascade-classifier-for-object-detection" rel="noreferrer">Haar-based classifier</a> to recognize the cross. This type of classifier is often used in face detection and detects oriented edges in images, classifying faces by the relative positions of several oriented edges. It has good classification accuracy on faces and is extremely fast. Although I cannot vouch for its accuracy in this particular situation it might provide some good results for simple shapes such as a cross.

3,071,532

How does instance_eval work and why does DHH hate it?

At about the 19:00 mark in <a href="http://www.youtube.com/watch?v=b0iKYRKtAsA#t=19m0s" rel="noreferrer">his RailsConf presentation</a>, David Heinemeier Hansson talks about the downsides of <code>instance_eval</code>: <blockquote> For a long time I ranted and raved against <code>instance_eval</code>, which is the concept of not using a yielded parameter (like <code>do |people|</code>) and just straight <code>do something</code> and then evaluate what's in that block within the scope of where you came from (I don't even know if that's a coherent explanation) For a long time I didn't like that because it felt more complex in some sense. If you wanted to put your own code in there were you going to trigger something that was already there? Were you going to override something? When you're yielding a specific variable you can chain everything off that and you can know [you're] not messing with anybody else's stuff </blockquote> This sounded interesting, but a) I don't know how how <code>instance_eval</code> works in the first place and b) I don't understand why it can be bad / increase complexity. Can someone explain?

3,071,983

3

0

null

2010-06-18 16:43:49.96 UTC

10

2019-02-09 05:22:10.667 UTC

null

25,068

null

1

23

ruby-on-rails|ruby

5,546

The thing that <code>instance_eval</code> does is that it runs the block in the context of a different instance. In other words, it changes the meaning of <code>self</code> which means it changes the meaning of instance methods and instance variables. This creates a cognitive disconnect: the context in which the block runs is not the context in which it appears on the screen. Let me demonstrate that with a slight variation of @Matt Briggs's example. Let's say we're building an email instead of a form: <pre><code>def mail builder = MailBuilder.new yield builder # executed after the block # do stuff with builder end mail do |f| f.subject @subject f.name name end </code></pre> In this case, <code>@subject</code> is an instance variable of your object and <code>name</code> is a method of your class. You can use nice object-oriented decomposition and store your subject in a variable. <pre><code>def mail &block builder = MailBuilder.new builder.instance_eval &block # do stuff with builder end mail do subject @subject name name # Huh?!? end </code></pre> In this case, <code>@subject</code> is an instance variable of the mail builder object! It might not even exist! (Or even worse, it might exist and contain some completely stupid value.) There is no way for you to get access to your object's instance variables. And how do you even call the <code>name</code> method of your object? Everytime you try to call it, you get the mail builder's method. Basically, <code>instance_eval</code> makes it hard to use your own code inside the DSL code. So, it should really only be used in cases where there is very little chance that this might be needed.

2,880,713

Time difference in seconds (as a floating point)

<pre><code>>>> from datetime import datetime >>> t1 = datetime.now() >>> t2 = datetime.now() >>> delta = t2 - t1 >>> delta.seconds 7 >>> delta.microseconds 631000 </code></pre> Is there any way to get that as 7.631000 ? I can use time module, but I also need that t1 and t2 variables as DateTime objects. So if there is an easy way to do it with datettime, that would be great. Otherwise it'll look ugly: <pre><code>t1 = datetime.now() _t1 = time.time() t2 = datetime.now() diff = time.time() - _t1 </code></pre>

2,880,735

3

0

null

2010-05-21 08:55:52.15 UTC

6

2018-12-18 06:35:01.293 UTC

2012-05-10 13:09:52.3 UTC

null

44,390

null

304,796

null

1

30

python|datetime|floating-point

53,053

<code>combined = delta.seconds + delta.microseconds/1E6</code>

2,552,416

How can I find the user's home dir in a cross platform manner, using C++?

How can I find the user's home directory in a cross platform manner in C++? i.e. /home/user in Linux, C:\Users\user\ on Windows Vista, C:\Documents And Settings\user\ on Windows XP, and whatever it is that Macs use. (I think it's /User/user) Basically, what I'm looking for is a C++ way of doing this (example in python) <pre><code>os.path.expanduser("~") </code></pre>

2,552,458

3

null

2010-03-31 11:23:46.203 UTC

13

2022-05-07 20:44:42.507 UTC

2018-07-19 03:13:20.607 UTC

null

8,815,948

null

67,366

null

1

32

c++|cross-platform|home-directory

22,687

I don't think it's possible to completely hide the Windows/Unix divide with this one (unless, maybe, Boost has something). The most portable way would have to be <code>getenv("HOME")</code> on Unix and concatenating the results of <code>getenv("HOMEDRIVE")</code> and <code>getenv("HOMEPATH")</code> on Windows.

2,611,980

Return value from nested function in Javascript

I have a function that is set up as follows <pre><code>function mainFunction() { function subFunction() { var str = "foo"; return str; } } var test = mainFunction(); alert(test); </code></pre> To my logic, that alert should return 'foo', but instead it returns undefined. What am I doing wrong? UPDATE: Here's my actual code (it's a function for reverse-geocoding with the Google API) <pre><code>function reverseGeocode(latitude,longitude){ var address = ""; var country = ""; var countrycode = ""; var locality = ""; var geocoder = new GClientGeocoder(); var latlng = new GLatLng(latitude, longitude); return geocoder.getLocations(latlng, function(addresses) { address = addresses.Placemark[0].address; country = addresses.Placemark[0].AddressDetails.Country.CountryName; countrycode = addresses.Placemark[0].AddressDetails.Country.CountryNameCode; locality = addresses.Placemark[0].AddressDetails.Country.AdministrativeArea.SubAdministrativeArea.Locality.LocalityName; return country; }); } </code></pre>

2,611,984

3

1

null

2010-04-10 02:15:30.003 UTC

16

2015-11-03 14:29:57.723 UTC

2010-04-10 02:24:57.52 UTC

null

145,750

null

145,750

null

1

64

javascript|function|nested|return-value|return

124,301

you have to call a function before it can return anything. <pre><code>function mainFunction() { function subFunction() { var str = "foo"; return str; } return subFunction(); } var test = mainFunction(); alert(test); </code></pre> Or: <pre><code>function mainFunction() { function subFunction() { var str = "foo"; return str; } return subFunction; } var test = mainFunction(); alert( test() ); </code></pre> for your actual code. The return should be outside, in the main function. The callback is called somewhere inside the <code>getLocations</code> method and hence its return value is not recieved inside your main function. <pre><code>function reverseGeocode(latitude,longitude){ var address = ""; var country = ""; var countrycode = ""; var locality = ""; var geocoder = new GClientGeocoder(); var latlng = new GLatLng(latitude, longitude); geocoder.getLocations(latlng, function(addresses) { address = addresses.Placemark[0].address; country = addresses.Placemark[0].AddressDetails.Country.CountryName; countrycode = addresses.Placemark[0].AddressDetails.Country.CountryNameCode; locality = addresses.Placemark[0].AddressDetails.Country.AdministrativeArea.SubAdministrativeArea.Locality.LocalityName; }); return country } </code></pre>

2,579,995

Control the size of points in an R scatterplot?

In R, the <code>plot()</code> function takes a <code>pch</code> argument that controls the appearance of the points in the plot. I'm making scatterplots with tens of thousands of points and prefer a small, but not too small dot. Basically, I find <code>pch='.'</code> to be too small, but <code>pch=19</code> to be too fat. Is there something in the middle or some way to scale the dots down somehow?

2,580,113

3

5

null

2010-04-05 17:54:33.243 UTC

20

2019-02-26 21:58:24.753 UTC

null

4,685,471

null

5,222

null

1

136

r|plot|scatter-plot

356,429

Try the <code>cex</code> argument: <code>?par</code> <ul> <li><code>cex</code> A numerical value giving the amount by which plotting text and symbols should be magnified relative to the default. Note that some graphics functions such as plot.default have an argument of this name which multiplies this graphical parameter, and some functions such as points accept a vector of values which are recycled. Other uses will take just the first value if a vector of length greater than one is supplied.</li> </ul>

29,070,505

How to create new core in Solr 5?

Currently we are using Apache Solr 4.10.3 OR Heliosearch Distribution for Solr [HDS] as a search engine to index our data. Now after that, I got the news about Apache Solr 5.0.0 release in last month. I'd successfully installed Apache Solr 5.0.0 version and now its running properly on <code>8983</code> port (means only running solr but unable to create core). In that UI, I'm unable to find the example core as well as schema or config files under it. So, I started creating new core as we create in old versions but unable to create one. Following is the error, I'm getting it: <blockquote> Error CREATEing SolrCore 'testcore1': Unable to create core [testcore1] Caused by: Could not find configName for collection testcore1 found:null </blockquote> Note: I also seen Cloud tab on (ie. <a href="http://localhost:8983/solr/" rel="noreferrer">http://localhost:8983/solr/</a>) left side of Solr UI and also don't know how it works? Meaning I don't know the location of the <code>schema.xml</code>, <code>solrconfig.xml</code> files due to lack of example folder (Collection1) and how to update those files? Is there any useful document or solution available to solve this error?

29,077,908

7

0

null

2015-03-16 06:06:24.883 UTC

6

2022-03-07 07:27:18.283 UTC

null

7,329,832

null

1,534,964

null

1

20

solr|lucene

54,741

In Solr 5, creation of cores is supported by the bin/solr script provided in the distribution. Try <pre><code>bin/solr create -help </code></pre> for a quick introduction. From the above help doc, you may find: <pre><code>bin/solr create [-c name] [-d confdir] [-n configName] [-shards #] [-replicationFactor #] [-p port] </code></pre>

31,913,967

How to set ChartJS Y axis title?

I am using <a href="http://www.chartjs.org" rel="noreferrer">Chartjs</a> for showing diagrams and I need to set title of y axis, but there are no information about it in documentation. I need y axis to be set like on picture, or on top of y axis so someone could now what is that parameter <img src="https://js.devexpress.com/Content/images/doc/15_1/ChartJS/fullStackedSplineArea.png" alt=""> I have looked on official website but there was no information about it

31,918,380

7

1

null

2015-08-10 07:34:46.367 UTC

15

2021-04-04 19:09:38.317 UTC

2018-02-27 16:49:34.287 UTC

null

771,496

null

1,306,105

null

1

64

javascript|jquery|charts|chart.js

113,190

For Chart.js 2.x refer to andyhasit's answer - <a href="https://stackoverflow.com/a/36954319/360067">https://stackoverflow.com/a/36954319/360067</a> For Chart.js 1.x, you can tweak the options and extend the chart type to do this, like so <pre><code>Chart.types.Line.extend({ name: "LineAlt", draw: function () { Chart.types.Line.prototype.draw.apply(this, arguments); var ctx = this.chart.ctx; ctx.save(); // text alignment and color ctx.textAlign = "center"; ctx.textBaseline = "bottom"; ctx.fillStyle = this.options.scaleFontColor; // position var x = this.scale.xScalePaddingLeft * 0.4; var y = this.chart.height / 2; // change origin ctx.translate(x, y); // rotate text ctx.rotate(-90 * Math.PI / 180); ctx.fillText(this.datasets[0].label, 0, 0); ctx.restore(); } }); </code></pre> calling it like this <pre><code>var ctx = document.getElementById("myChart").getContext("2d"); var myLineChart = new Chart(ctx).LineAlt(data, { // make enough space on the right side of the graph scaleLabel: " <%=value%>" }); </code></pre> Notice the space preceding the label value, this gives us space to write the y axis label without messing around with too much of Chart.js internals <hr> Fiddle - <a href="http://jsfiddle.net/wyox23ga/" rel="noreferrer">http://jsfiddle.net/wyox23ga/</a> <hr> <a href="https://i.stack.imgur.com/7qtsB.png" rel="noreferrer"><img src="https://i.stack.imgur.com/7qtsB.png" alt="enter image description here"></a>

48,631,769

Pandas str.contains - Search for multiple values in a string and print the values in a new column

I just started coding in Python and want to build a solution where you would search a string to see if it contains a given set of values. I've find a similar solution in R which uses the stringr library: <a href="https://stackoverflow.com/questions/42707348/search-for-a-value-in-a-string-and-if-the-value-exists-print-it-all-by-itself-i">Search for a value in a string and if the value exists, print it all by itself in a new column</a> The following code seems to work but i also want to output the three values that i'm looking for and this solution will only output one value: <pre><code>#Inserting new column df.insert(5, "New_Column", np.nan) #Searching old column df['New_Column'] = np.where(df['Column_with_text'].str.contains('value1|value2|value3', case=False, na=False), 'value', 'NaN') </code></pre> ------ Edit ------ So i realised i didn't give that good of an explanation, sorry about that. Below is an example where i match fruit names in a string and depending on if it finds any matches in the string it will print out either true or false in a new column. Here's my question: Instead of printing out true or false i want to print out the name it found in the string eg. apples, oranges etc. <pre><code>import pandas as pd import numpy as np text = [('I want to buy some apples.', 0), ('Oranges are good for the health.', 0), ('John is eating some grapes.', 0), ('This line does not contain any fruit names.', 0), ('I bought 2 blueberries yesterday.', 0)] labels = ['Text','Random Column'] df = pd.DataFrame.from_records(text, columns=labels) df.insert(2, "MatchedValues", np.nan) foods =['apples', 'oranges', 'grapes', 'blueberries'] pattern = '|'.join(foods) df['MatchedValues'] = df['Text'].str.contains(pattern, case=False) print(df) </code></pre> Result <pre><code> Text Random Column MatchedValues 0 I want to buy some apples. 0 True 1 Oranges are good for the health. 0 True 2 John is eating some grapes. 0 True 3 This line does not contain any fruit names. 0 False 4 I bought 2 blueberries yesterday. 0 True </code></pre> Wanted result <pre><code> Text Random Column MatchedValues 0 I want to buy some apples. 0 apples 1 Oranges are good for the health. 0 oranges 2 John is eating some grapes. 0 grapes 3 This line does not contain any fruit names. 0 NaN 4 I bought 2 blueberries yesterday. 0 blueberries </code></pre>

48,773,173

2

0

null

2018-02-05 21:27:19.503 UTC

6

2018-02-26 20:43:12.157 UTC

2018-02-12 20:48:48.947 UTC

user5431582

null

user5431582

null

1

9

python|string|pandas

41,304

Here is one way: <pre><code>foods =['apples', 'oranges', 'grapes', 'blueberries'] def matcher(x): for i in foods: if i.lower() in x.lower(): return i else: return np.nan df['Match'] = df['Text'].apply(matcher) # Text Match # 0 I want to buy some apples. apples # 1 Oranges are good for the health. oranges # 2 John is eating some grapes. grapes # 3 This line does not contain any fruit names. NaN # 4 I bought 2 blueberries yesterday. blueberries </code></pre>

42,954,454

Can't add Team ID in Firebase Project settings

I am trying to add dynamic links to my app and I am following this guide: <a href="https://www.youtube.com/watch?v=sFPo296OQqk" rel="noreferrer">https://www.youtube.com/watch?v=sFPo296OQqk</a> At around 3:20 he explains how to add team ID in the project settings but for me this option simply isn't there. I have checked all my projects and none of them has this option in project settings. This is a problem since dynamic links does not work without that added since I've seen people around with similar problem as me (that was solved by adding the Team ID they had forgot). Is there any solution to this? I'm working on a iOS project and my location is Sweden if that somehow matters. Any help is very much appreciated.

42,970,607

7

0

null

2017-03-22 14:25:25.71 UTC

4

2021-02-10 15:30:25.527 UTC

null

6,404,863

null

1

34

ios|swift|firebase|firebase-dynamic-links

16,508

I resolved this by instead adding the team ID to the App ID Prefix field. Seems to be working in the exact same way.

36,553,129

What is the shortest way to modify immutable objects using spread and destructuring operators

I'm looking for a pure function, to modify my immutable state object. The original state given as parameter must stay untouched. This is especially useful when working with frameworks like <a href="https://github.com/reactjs/redux" rel="noreferrer">Redux</a> and makes working with <a href="https://facebook.github.io/immutable-js/" rel="noreferrer">immutable</a> object in javascript much easier. Especially since working with the object spread operator using <a href="https://babeljs.io/" rel="noreferrer">Babel</a> is already possible. I did not found anything better than first copy the object, and than assign/delete the property I want like this: <pre><code>function updateState(state, item) { newState = {...state}; newState[item.id] = item; return newState; } function deleteProperty(state, id) { var newState = {...state}; delete newState[id]; return newState; } </code></pre> I feel like it could be shorter

36,553,130

6

0

null

2016-04-11 15:36:53.41 UTC

13

2019-03-29 19:30:22.077 UTC

2016-05-03 15:35:16.797 UTC

null

86,388

null

86,388

null

1

27

javascript|destructuring|ecmascript-next

17,465

Actions on state, where state is considered immutable. Adding or Updating the value of a property: <pre><code>// ES6: function updateState(state, item) { return Object.assign({}, state, {[item.id]: item}); } // With Object Spread: function updateState(state, item) { return { ...state, [item.id]: item }; } </code></pre> Deleting a property <pre><code>// ES6: function deleteProperty(state, id) { var newState = Object.assign({}, state); delete newState[id]; return newState; } // With Object Spread: function deleteProperty(state, id) { let {[id]: deleted, ...newState} = state; return newState; } // Or even shorter as helper function: function deleteProperty({[id]: deleted, ...newState}, id) { return newState; } // Or inline: function deleteProperty(state, id) { return (({[id]: deleted, ...newState}) => newState)(state); } </code></pre>

32,063,985

Deleting a div with a particlular class using BeautifulSoup

I want to delete the specific <code>div</code> from <code>soup</code> object. I am using <code>python 2.7</code> and <code>bs4</code>. According to documentation we can use <code>div.decompose()</code>. But that would delete all the <code>div</code>. How can I delete a <code>div</code> with specific class?

32,064,299

4

0

null

2015-08-18 05:10:59.253 UTC

13

2018-03-28 12:37:46.387 UTC

2015-08-18 05:21:32.133 UTC

null

4,198,139

null

5,047,436

null

1

51

python|python-2.7|beautifulsoup

49,679

Sure, you can just <a href="http://www.crummy.com/software/BeautifulSoup/bs4/doc/#css-selectors" rel="noreferrer"><code>select</code></a>, <a href="http://www.crummy.com/software/BeautifulSoup/bs4/doc/#find" rel="noreferrer"><code>find</code></a>, or <a href="http://www.crummy.com/software/BeautifulSoup/bs4/doc/#find-all" rel="noreferrer"><code>find_all</code></a> the <code>div</code>s of interest in the usual way, and then call <a href="http://www.crummy.com/software/BeautifulSoup/bs4/doc/#decompose" rel="noreferrer"><code>decompose()</code></a> on those divs. For instance, if you want to remove all divs with class <code>sidebar</code>, you could do that with <pre><code># replace with `soup.findAll` if you are using BeautifulSoup3 for div in soup.find_all("div", {'class':'sidebar'}): div.decompose() </code></pre> If you want to remove a div with a specific <code>id</code>, say <code>main-content</code>, you can do that with <pre><code>soup.find('div', id="main-content").decompose() </code></pre>

40,598,942

Swift 3 : How to get path of file saved in Documents folder

<pre><code>path = Bundle.main.path(forResource: "Owl.jpg", ofType: "jpg") </code></pre> returns nil, however, using <code>NSHomeDirectory()</code> I'm able to verify that is under <code>Documents/</code> folder.

40,598,962

3

2

null

2016-11-14 22:32:02.503 UTC

11

2022-02-21 12:02:17.863 UTC

null

419,730

null

1

13

ios|swift3

27,564

First, separate name and extension: <pre><code>Bundle.main.path(forResource: "Owl", ofType: "jpg") </code></pre> Second, separate (mentally) your bundle and the Documents folder. They are two completely different things. If this file is the Documents folder, it absolutely is not in your main bundle! You probably want something like this: <pre><code>let fm = FileManager.default let docsurl = try! fm.url(for:.documentDirectory, in: .userDomainMask, appropriateFor: nil, create: false) let myurl = docsurl.appendingPathComponent("Owl.jpg") </code></pre> Third, if Owl is an image asset in the asset catalog, then say <pre><code>let im = UIImage(named:"Owl") // or whatever its name is </code></pre>

31,509,299

Adding Trusted Location to Access Run Time

I have created a Microsoft Access file. How do I add this file to the trusted locations on my client's PC where there is only the runtime version of Access installed?

31,509,300

5

0

null

2015-07-20 05:23:39.337 UTC

4

2021-12-18 14:38:18.617 UTC

2020-09-10 19:10:32.073 UTC

null

2,779,697

null

4,050,261

null

1

10

ms-access|runtime|ms-access-2010|ms-access-2013

42,643

Access 2007: <pre><code>[HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Access\Security\Trusted Locations] [HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Access\Security\Trusted Locations\Location(n)] </code></pre> Access 2010: <pre><code>[HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Access\Security\Trusted Locations] [HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Access\Security\Trusted Locations\Location(n)] </code></pre> Access 2013: <pre><code>[HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\Access\Security\Trusted Locations] [HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\Access\Security\Trusted Locations\Location(n)] </code></pre> Access 2016 & Access 2019 & Office 365: <pre><code>[HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Access\Security\Trusted Locations] [HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Access\Security\Trusted Locations\Location(n)] </code></pre> Example of how it will look <pre><code>"Path"="C:\PathToDB\" "AllowSubfolders"=dword:00000001 "Description"="The description" "Date"="01.01.2007 12:00" </code></pre> If editing Reg is not cup of your Tea, then use AddPath <a href="http://www.accessribbon.de/en/?Trust_Center:Trusted_Locations" rel="noreferrer">http://www.accessribbon.de/en/?Trust_Center:Trusted_Locations</a>

25,100,449

MATLAB error: Subscript indices must either be real positive integers or logicals

I'm currently running my code, and found an annoying problem that I really haven't got any idea to solve. The function that I'm working out is as follows; <pre><code>function out = CointPairs(PriceMat, Symbols) out=[]; NofStocks = size(PriceMat, 2); CointMatrix= zeros(NofStocks); [rows, cols] = find(CointMatrix); CointPairs = [rows, cols]; **cf= (CointPairs(:,1)-CointPairs(:,2))==0;** CointPairs(cf,:) = []; if(isempty(CointPairs)) warning('No Cointegrated Pairs Found') return end end </code></pre> And the bloody problem occurs at this line: <pre><code>cf= (CointPairs(:,1)-CointPairs(:,2))==0; </code></pre> saying that "Subscript indices must either be real positive integers or logicals." well, the input variable "PriceMat" is the price matrix 60x10, and "Symbols" is 10x1 string. One more question :) what's exactly meant by "subscript indices"? MUCH appreciated in advance xx

25,100,980

4

0

null

2014-08-03 00:05:35.7 UTC

null

2017-10-22 21:39:15.047 UTC

2014-08-07 17:30:58.98 UTC

null

3,903,050

null

3,903,050

null

1

4

matlab

62,542

Let's tackle your questions one at a time: <blockquote> "Subscript indices must either be real positive integers or logicals." well, the input variable "PriceMat" is the price matrix 60x10, and "Symbols" is 10x1 string. </blockquote> Take a look at your <code>CointPairs</code> variable. This is the result from using the <code>find</code> command. There may be a case where <code>CointPairs</code> produces the empty matrix. This is because when you run <code>find</code>, there may be a case where there is no entry in your <code>CointMatrix</code> where it's equal to 1 (or non-zero actually). If this is the case, then <code>CointPairs</code> will actually be empty as there are no elements that meet the requirements. As such, the reason why you're getting that error is because you are trying to do operations on an empty matrix when that's not allowed. You need to move your <code>if</code> statement before you do <code>CointPairs = [rows, cols];</code>. That way, you won't get any accessing errors. In other words, do this: <pre><code>[rows, cols] = find(CointMatrix); CointPairs = [rows, cols]; %// Move here if(isempty(CointPairs)) warning('No Cointegrated Pairs Found'); out = []; %// Make output empty - Must return something or you get an error return end %// Continue here cf= (CointPairs(:,1)-CointPairs(:,2))==0; CointPairs(cf,:) = []; %// More code here... %// ... </code></pre> One minor comment I have is that your output variable is <code>out</code>, but you are not assigning it anywhere in your code. Is this intentional? <hr> <blockquote> One more question :) what's exactly meant by "subscript indices"? </blockquote> Subscript indices are those values you use to access elements in your array / matrix. For example, suppose your matrix is: <pre><code>A = [1 2 3; 4 5 6; 7 8 9]; </code></pre> By doing <code>A(2,2)</code>, we get the element 5. The row 2 and the column 2 is known as subscript index. Indices implies more than one, so instead of just a single pair of row and column locations, you can use two arrays of elements to access the rows and columns of your matrix. Each pair of corresponding elements in the pair is a subscript index. Basically, they are numbers that you use to access the rows and columns of your matrix. You can only access elements in matrices / arrays using positive numbers (a.k.a. 1, 2, 3, 4...) or logical operators (i.e. <code>true / false</code>). The empty matrix, 0, negative integers or floating point numbers are not allowed. Because you are accessing your matrix using neither of the above valid inputs, you get that error. <hr> Hope this helps!

25,437,817

"Don't run bundler as root" - what is the exact difference made by using root?

If you run ruby bundler from the command line while logged in as root, you get the following warning: <blockquote> Don't run Bundler as root. Bundler can ask for sudo if it is needed, and installing your bundle as root will break this application for all non-root users on this machine. </blockquote> What is this exact difference that running bundler as root makes to the gems it installs? Is it to do with the permissions of the actual files that it installs for each gem? Will Ruby try to access the gem files as a non-root user (and if so, what user / group would Ruby use and how would I find out)? What would be the symptoms of an application that is broken due to bundler being used as root? <hr> My specific reason for asking is because I'm trying to use bundler on a very basic Centos VPS where I have no need to set up any non-root users. I'm <a href="https://stackoverflow.com/questions/25438186/what-could-cause-one-gem-in-a-gemset-to-be-unavailable-while-all-the-others-are">having other problems with gems installed via bundler</a> (<code>Error: file to import not found or unreadable: gemname</code> despite the gem in question being present in <code>gem list</code>), and I'm wondering if installing the gems via bundler as root might have made the files unreadable to Ruby. I want to work out if I do need to set up a non-root user account purely for running bundler, and if I do, what groups and privileges this user will need to allow Ruby to run the gems bundler installs. Or can I just <code>chown</code> or <code>chgrp</code> the gem folders? If so, does it depend on anything to do with how Ruby is installed? (I used RVM and my gems end up in <code>/usr/local/rvm/gems/</code> which is owned by root in group rvm) <a href="https://stackoverflow.com/questions/16376995/bundler-cannot-install-any-gems-without-sudo">This loosely related question's answer implies that unspecified aspects of how Ruby is installed influence bundler's permissions requirements</a>. Researching the "Don't run bundler as root" message only comes up with <a href="https://stackoverflow.com/questions/25210957/dont-run-bundler-as-root-error">an unanswered question</a> and <a href="http://www.coldplaysucks.com/blogs/news/13799949-dont-run-bundler-as-root" rel="noreferrer">complaints that this warning is apparently "like it saying to go to sleep at 8PM" (link contains NSFW language)</a>.

34,318,529

1

0

null

2014-08-22 00:11:09.93 UTC

6

2015-12-16 17:36:21.197 UTC

2017-05-23 11:55:13.833 UTC

null

-1

null

568,458

null

1

28

ruby|gem|bundler

40,736

So I had to dig into the git log history of bundler's repo, because GitHub <a href="https://stackoverflow.com/questions/18122628/how-to-search-for-a-commit-message-on-github">doesn't allow search</a> in git commits messages anymore. The commit <code>c1b3fd165b2ec97fb254a76eaa3900bc4857a357</code> says : <blockquote> Print warning when bundler is run by root. When a user runs bundle install with sudo bundler will print a warning, letting them know of potential consequences. closes <a href="https://github.com/bundler/bundler/issues/2936" rel="noreferrer">#2936</a> </blockquote> Reading this issue, you understand the real reason you should not use the <code>root</code> user: <blockquote> Running sudo bundle install can cause huge and cascading problems for users trying to install gems on OS X into the system gems. We should print a warning and explain that Bundler will prompt for sudo if it's needed. We should also warn people that sudo bundle will break git gems, because they have to be writable by the user that Bundler runs as. </blockquote>

43,444,752

How to round up to whole number in R?

Is it possible to round up to the nearest whole number in R? I have time-stamped data and I want to round up to the nearest whole minute, to represent activities during this minute. For example, if time is presented in <code>minutes.seconds</code> format: <pre><code>x <- c(5.56, 7.39, 12.05, 13.10) round(x, digits = 0) [1] 6 7 12 13 </code></pre> My anticipated output would instead be: <pre><code>round(x, digits = 0) [1] 6 8 13 14 </code></pre> I understand this is confusing but when I am calculating activity per minute data, rounding up to the nearest minute makes sense. Is this possible?

43,444,765

1

0

null

2017-04-17 03:34:38.023 UTC

4

2021-04-21 07:03:03.613 UTC

2017-04-17 04:56:50.563 UTC

null

4,497,050

null

2,716,568

null

1

38

r|rounding

72,257

We can use <code>ceiling</code> to do the specified rounding <pre><code>ceiling(x) #[1] 6 8 13 14 </code></pre>

857,414

Dynamically create an enum

I have an enum of the following structure: <pre><code>public enum DType { LMS = 0, DNP = -9, TSP = -2, ONM = 5, DLS = 9, NDS = 1 } </code></pre> I'm using this enum to get the names and the values. Since there is a requirement to add more types, I need to read the type and the values from an XML file. Is there any way by which I can create this enum dynamically from XML file so that I can retain the program structure.

857,421

2

0

null

2009-05-13 11:26:12.927 UTC

10

2018-10-10 06:58:29.743 UTC

null

6,908,525

null

93,974

null

1

36

c#

74,970

Probably, you should consider using a <code>Dictionary<string, int></code> instead. If you want to generate the <code>enum</code> at compile-time dynamically, you might want to consider <a href="http://www.hanselman.com/blog/T4TextTemplateTransformationToolkitCodeGenerationBestKeptVisualStudioSecret.aspx" rel="noreferrer">T4</a>.

2,336,474

In-place progress output in the terminal or console

When you run <code>git clone</code>, it updates progress in place. For example, the percentage of the objects received changes in place. <pre><code>user@athena:~/cloj/src$ git clone git://git.boinkor.net/slime.git Initialized empty Git repository in /home/user/cloj/src/slime/.git/ remote: Counting objects: 15936, done. remote: Compressing objects: 100% (5500/5500), done. Receiving objects: 28% (4547/15936), 3.16 MiB | 165 KiB/s </code></pre> How is this acccomplished? Does it use ncurses or something even simpler, like some combination of backspace characters and regular character output? I'm especially interested in how this kind of console output could be accomplished from Ruby. EDIT My original question is answered. But here's an addendum. When you use MPlayer, for example, it not only updates a line to show current progress, but also the previous line (e.g. when you press pause). <pre><code> ===== PAUSE ===== A: 79.9 (01:19.9) of 4718.0 ( 1:18:38.0) 0.3% </code></pre> How would you update two lines of output in-place?

2,336,607

5

2

null

2010-02-25 18:13:17.957 UTC

11

2017-02-10 12:51:43.157 UTC

2010-02-28 19:54:56.57 UTC

null

232,417

null

232,417

null

1

33

ruby|unix|terminal|ncurses

9,637

Use carriage return. '\r' should usually work.

2,544,454

Get the currency format for a country that does not have a Locale constant

I want to get the currency format of India, so I need a <code>Locale</code> object for India. But there exists only few a countries that have a <code>Locale</code> constant (a <code>static final Locale</code>), and India is not one of them. To get the currency symbols for the US and UK, I can do the following: <pre><code>public void displayCurrencySymbols() { Currency currency = Currency.getInstance(Locale.US); System.out.println("United States: " + currency.getSymbol()); currency = Currency.getInstance(Locale.UK); System.out.println("United Kingdom: " + currency.getSymbol()); } </code></pre> That uses the constants <code>Locale.US</code> and <code>Locale.UK</code>. If i want to get the Indian currency format, what can I do?

2,544,488

6

5

null

2010-03-30 10:34:35.923 UTC

7

2020-06-12 15:27:43.177 UTC

2013-08-30 12:24:23.67 UTC

null

545,127

null

277,516

null

1

45

java|currency

53,272

According to the <a href="https://docs.oracle.com/javase/1.5.0/docs/guide/intl/locale.doc.html" rel="noreferrer">JDK release notes</a>, you have locale codes <code>hi_IN</code> (Hindi) and <code>en_IN</code> (English). <pre><code>System.out.println(Currency.getInstance(new Locale("hi", "IN")).getSymbol()); </code></pre>

2,943,548

How to reset / remove chrome's input highlighting / focus border?

I have seen that chrome puts a thicker border on <code>:focus</code> but it kind of looks off in my case where I've used border-radius also. Is there anyway to remove that? <img src="https://farm5.static.flickr.com/4029/4655472389_c68d1216f0_b.jpg" alt="image: chrome :focus border">

2,943,582

8

1

null

2010-05-31 12:37:24.313 UTC

60

2020-06-10 17:51:28.763 UTC

2017-09-08 14:44:45.377 UTC

null

497,397

null

292,291

null

1

414

css|google-chrome|focus|border

500,880

You should be able to remove it using <pre><code>outline: none; </code></pre> but keep in mind this is potentially bad for usability: It will be hard to tell whether an element is focused, which can suck when you walk through all a form's elements using the <kbd>Tab</kbd> key - you should reflect somehow when an element is focused.

2,431,732

Checking if a bit is set or not

How to check if a certain bit in a byte is set? <pre><code>bool IsBitSet(Byte b,byte nPos) { return .....; } </code></pre>

2,431,759

9

2

null

2010-03-12 09:45:27.433 UTC

14

2021-05-20 08:41:43.46 UTC

2012-01-27 07:35:24.493 UTC

null

41,956

null

150,174

null

1

70

c#|.net|bit-manipulation

112,860

sounds a bit like homework, but: <pre><code>bool IsBitSet(byte b, int pos) { return (b & (1 << pos)) != 0; } </code></pre> pos 0 is least significant bit, pos 7 is most.

3,094,866

Trimming a huge (3.5 GB) csv file to read into R

So I've got a data file (semicolon separated) that has a lot of detail and incomplete rows (leading Access and SQL to choke). It's county level data set broken into segments, sub-segments, and sub-sub-segments (for a total of ~200 factors) for 40 years. In short, it's huge, and it's not going to fit into memory if I try to simply read it. So my question is this, given that I want all the counties, but only a single year (and just the highest level of segment... leading to about 100,000 rows in the end), what would be the best way to go about getting this rollup into R? Currently I'm trying to chop out irrelevant years with Python, getting around the filesize limit by reading and operating on one line at a time, but I'd prefer an R-only solution (CRAN packages OK). Is there a similar way to read in files a piece at a time in R? Any ideas would be greatly appreciated. Update: <ul> <li>Constraints</li> <ul> <li>Needs to use my machine, so no EC2 instances</li> <li>As R-only as possible. Speed and resources are not concerns in this case... provided my machine doesn't explode...</li> <li>As you can see below, the data contains mixed types, which I need to operate on later</li></ul> <li>Data</li> <ul> <li>The data is 3.5GB, with about 8.5 million rows and 17 columns</li> <li>A couple thousand rows (~2k) are malformed, with only one column instead of 17</li> <ul><li>These are entirely unimportant and can be dropped</li></ul> <li>I only need ~100,000 rows out of this file (See below)</li></ul> </ul> Data example: <pre><code>County; State; Year; Quarter; Segment; Sub-Segment; Sub-Sub-Segment; GDP; ... Ada County;NC;2009;4;FIRE;Financial;Banks;80.1; ... Ada County;NC;2010;1;FIRE;Financial;Banks;82.5; ... NC [Malformed row] [8.5 Mill rows] </code></pre> I want to chop out some columns and pick two out of 40 available years (2009-2010 from 1980-2020), so that the data can fit into R: <pre><code>County; State; Year; Quarter; Segment; GDP; ... Ada County;NC;2009;4;FIRE;80.1; ... Ada County;NC;2010;1;FIRE;82.5; ... [~200,000 rows] </code></pre> Results: After tinkering with all the suggestions made, I decided that readLines, suggested by JD and Marek, would work best. I gave Marek the check because he gave a sample implementation. I've reproduced a slightly adapted version of Marek's implementation for my final answer here, using strsplit and cat to keep only columns I want. It should also be noted this is MUCH less efficient than Python... as in, Python chomps through the 3.5GB file in 5 minutes while R takes about 60... but if all you have is R then this is the ticket. <pre><code>## Open a connection separately to hold the cursor position file.in <- file('bad_data.txt', 'rt') file.out <- file('chopped_data.txt', 'wt') line <- readLines(file.in, n=1) line.split <- strsplit(line, ';') # Stitching together only the columns we want cat(line.split[[1]][1:5], line.split[[1]][8], sep = ';', file = file.out, fill = TRUE) ## Use a loop to read in the rest of the lines line <- readLines(file.in, n=1) while (length(line)) { line.split <- strsplit(line, ';') if (length(line.split[[1]]) > 1) { if (line.split[[1]][3] == '2009') { cat(line.split[[1]][1:5], line.split[[1]][8], sep = ';', file = file.out, fill = TRUE) } } line<- readLines(file.in, n=1) } close(file.in) close(file.out) </code></pre> Failings by Approach: <ul> <li>sqldf</li> <ul><li>This is definitely what I'll use for this type of problem in the future if the data is well-formed. However, if it's not, then SQLite chokes.</li></ul> <li>MapReduce</li> <ul><li>To be honest, the docs intimidated me on this one a bit, so I didn't get around to trying it. It looked like it required the object to be in memory as well, which would defeat the point if that were the case.</li></ul> <li>bigmemory</li> <ul><li>This approach cleanly linked to the data, but it can only handle one type at a time. As a result, all my character vectors dropped when put into a big.table. If I need to design large data sets for the future though, I'd consider only using numbers just to keep this option alive.</li></ul> <li>scan</li> <ul><li>Scan seemed to have similar type issues as big memory, but with all the mechanics of readLines. In short, it just didn't fit the bill this time.</li></ul> </ul>

3,108,397

13

7

null

2010-06-22 16:00:09.23 UTC

62

2017-09-26 03:39:49.857 UTC

2014-11-13 00:43:07.4 UTC

null

239,923

null

274,689

null

1

88

r|csv

24,796

My try with <code>readLines</code>. This piece of a code creates <code>csv</code> with selected years. <pre><code>file_in <- file("in.csv","r") file_out <- file("out.csv","a") x <- readLines(file_in, n=1) writeLines(x, file_out) # copy headers B <- 300000 # depends how large is one pack while(length(x)) { ind <- grep("^[^;]*;[^;]*; 20(09|10)", x) if (length(ind)) writeLines(x[ind], file_out) x <- readLines(file_in, n=B) } close(file_in) close(file_out) </code></pre>

2,563,632

How can I merge two commits into one if I already started rebase?

I am trying to merge 2 commits into 1, so I followed <a href="http://www.gitready.com/advanced/2009/02/10/squashing-commits-with-rebase.html" rel="noreferrer">“squashing commits with rebase” from git ready</a>. I ran <pre><code>git rebase --interactive HEAD~2 </code></pre> In the resulting editor, I change <code>pick</code> to <code>squash</code> and then save-quit, but the rebase fails with the error <blockquote> Cannot 'squash' without a previous commit </blockquote> Now that my work tree has reached this state, I’m having trouble recovering. The command <code>git rebase --interactive HEAD~2</code> fails with: <blockquote> Interactive rebase already started </blockquote> and <code>git rebase --continue</code> fails with <blockquote> Cannot 'squash' without a previous commit </blockquote>

2,568,581

14

5

null

2010-04-01 20:56:53.747 UTC

560

2021-10-13 13:16:05.867 UTC

2020-04-19 11:31:06.043 UTC

null

806,202

null

286,802

null

1

1,295

git|git-merge

980,250

<h3>Summary</h3> The error message <blockquote> Cannot 'squash' without a previous commit </blockquote> means you likely attempted to “squash downward.” Git always squashes a newer commit into an older commit or “upward” as viewed on the interactive rebase todo list, that is into a commit on a previous line. Changing the command on your todo list’s very first line to <code>squash</code> will always produce this error as there is nothing for the first commit to squash into. <h3>The Fix</h3> First get back to where you started with <pre><code>$ git rebase --abort </code></pre> Say your history is <pre><code>$ git log --pretty=oneline a931ac7c808e2471b22b5bd20f0cad046b1c5d0d c b76d157d507e819d7511132bdb5a80dd421d854f b df239176e1a2ffac927d8b496ea00d5488481db5 a </code></pre> That is, a was the first commit, then b, and finally c. After committing c we decide to squash b and c together: (Note: Running <code>git log</code> pipes its output into a pager, <a href="https://www.gnu.org/software/less/" rel="noreferrer"><code>less</code></a> by default on most platforms. To quit the pager and return to your command prompt, press the <code>q</code> key.) Running <code>git rebase --interactive HEAD~2</code> gives you an editor with <pre><code>pick b76d157 b pick a931ac7 c # Rebase df23917..a931ac7 onto df23917 # # Commands: # p, pick = use commit # r, reword = use commit, but edit the commit message # e, edit = use commit, but stop for amending # s, squash = use commit, but meld into previous commit # f, fixup = like "squash", but discard this commit's log message # # If you remove a line here THAT COMMIT WILL BE LOST. # However, if you remove everything, the rebase will be aborted. # </code></pre> (Notice that this todo list is in the reverse order as compared with the output of <code>git log</code>.) Changing b’s <code>pick</code> to <code>squash</code> will result in the error you saw, but if instead you squash c into b (newer commit into the older or “squashing upward”) by changing the todo list to <pre><code>pick b76d157 b squash a931ac7 c </code></pre> and save-quitting your editor, you'll get another editor whose contents are <pre><code># This is a combination of 2 commits. # The first commit's message is: b # This is the 2nd commit message: c </code></pre> When you save and quit, the contents of the edited file become commit message of the new combined commit: <pre><code>$ git log --pretty=oneline 18fd73d3ce748f2a58d1b566c03dd9dafe0b6b4f b and c df239176e1a2ffac927d8b496ea00d5488481db5 a </code></pre> <h3>Note About Rewriting History</h3> Interactive rebase rewrites history. Attempting to push to a remote that contains the old history will fail because it is not a fast-forward. If the branch you rebased is a topic or feature branch in which you are working by yourself, no big deal. Pushing to another repository will require the <code>--force</code> option, or alternatively you may be able, depending on the remote repository’s permissions, to first delete the old branch and then push the rebased version. Examples of those commands that will potentially destroy work is outside the scope of this answer. Rewriting already-published history on a branch in which you are working with other people without very good reason such as leaking a password or other sensitive details forces work onto your collaborators and is antisocial and will annoy other developers. The <a href="https://git-scm.com/docs/git-rebase#_recovering_from_upstream_rebase" rel="noreferrer">“Recovering From an Upstream Rebase” section in the <code>git rebase</code> documentation</a> explains, with added emphasis. <blockquote> Rebasing (or any other form of rewriting) a branch that others have based work on is a bad idea: anyone downstream of it is forced to manually fix their history. This section explains how to do the fix from the downstream’s point of view. The real fix, however, would be to avoid rebasing the upstream in the first place. … </blockquote>

25,161,774

What are conventions for filenames in Go?

I could find the conventions for naming packages in Go: no underscore between words, everything lowercase. Does this convention apply to the filenames too? Do you also put one struct in one file as if you did for a java class and then name the file after the struct? Currently, if I have a struct WebServer, I put it in a file web_server.go.

25,162,021

6

0

null

2014-08-06 13:32:54.743 UTC

17

2022-05-09 16:39:13.363 UTC

null

3,802,013

null

1

167

go|naming-conventions

107,189

There's a few guidelines to follow. <ol> <li>File names that begin with "." or "_" are ignored by the go tool</li> <li>Files with the suffix <code>_test.go</code> are only compiled and run by the <code>go test</code> tool.</li> <li>Files with os and architecture specific suffixes automatically follow those same constraints, e.g. <code>name_linux.go</code> will only build on linux, <code>name_amd64.go</code> will only build on amd64. This is the same as having a <code>//+build amd64</code> line at the top of the file</li> </ol> See the <code>go</code> docs for more details: <a href="https://pkg.go.dev/cmd/go" rel="noreferrer">https://pkg.go.dev/cmd/go</a>

23,805,772

How to MongoDB aggregation in Node.js

<pre><code>var mongoose = require('mongoose'); var membersModel = require('./model_member.js'); exports.request_friend_list = function(req, res){ var userid=req.body.userid; console.log(userid); // membersModel.find({_id: userid,friends:{status:0}},{_id:0,'friends':1,},function(err,data) membersModel.aggregate( {$match: {_id:userid}}, {$project: {friends: 1}}, {$unwind: "$friends"}, {$match: {"friends.status": 0}} ,function(err,data){ if(err){ res.json({status:"error"}); throw err; }else{ if(JSON.stringify(data).length > 0){ console.log(JSON.stringify(data)); res.json(data); } else{ res.json({status: "Data is not Exist."}); console.log("Data is not Exist."); } } }); </code></pre> <code>membersModel.find({...})</code> is operating normally, but <code>memberModel.Aggregation({...})</code> is not working. This also works in MongoDB: <pre><code>db.members.aggregate({$match:_id: ObjectId("532b4729592f81596d000001"),$project:"friends":1,$unwind:"$friends",$match:"friends.status": 0}) </code></pre> What is the problem?

23,820,986

1

0

null

2014-05-22 11:38:58.973 UTC

null

2020-03-13 12:17:01.103 UTC

2014-05-23 08:29:53.8 UTC

null

2,313,887

null

3,664,775

null

1

9

node.js|mongodb|mongoose

38,652

The likely problem here is that your <code>userid</code> value is not actually a correct <code>ObjectID</code> type when it is being passed into the pipeline. This results in nothing being "matched" in the initial stage. Therefore as a more complete example: <pre><code>var mongoose = require("mongoose"); var Schema = mongoose.Schema; var ObjectID = require("mongodb").ObjectID; mongoose.connect("mongodb://localhost/test"); friendSchema = new Schema({ "name": String, "status": Number }); memberSchema = new Schema({ friends: [friendSchema] }); var Member = mongoose.model("Members", memberSchema ); var userid = new ObjectID("537ec520e98bcb378e811d54"); console.log( userid ); Member.aggregate([ { "$match": { "_id": userid } }, { "$unwind": "$friends" }, { "$match": { "friends.status": 0 } }], function( err, data ) { if ( err ) throw err; console.log( JSON.stringify( data, undefined, 2 ) ); } ); </code></pre> Which then will match data as expected: <pre><code>[ { "_id": "537ec520e98bcb378e811d54", "friends": [{ "name": "Ted", "status": 0 }] } ] </code></pre> So be careful to make sure this is of the correct type. The aggregate method does not automatically wrap a string value such as "537ec520e98bcb378e811d54" into an <code>ObjectID</code> type when it is mentioned in a pipeline stage against <code>_id</code> in the way that Mongoose does this with other find and update methods.

40,238,574

Selenium Python wait for text to be present in element error shows takes 3 arguments 2 given

I am using WebdriverWait to wait for some text to be present in an element on a webpage. I am using Selenium with Python. My syntax is not correct. I am getting the error: TypeError: init() takes exactly 3 arguments (2 given): Error trace: <pre><code>Traceback (most recent call last): File "E:\test_runners 2 edit project\selenium_regression_test_5_1_1\Regression_TestCase\RegressionProjectEdit_TestCase.py", line 2714, in test_000057_run_clean_and_match_process process_lists_page.wait_for_run_process_to_finish() File "E:\test_runners 2 edit project\selenium_regression_test_5_1_1\Pages\operations.py", line 334, in wait_for_run_process_to_finish EC.text_to_be_present_in_element("No data to display")) TypeError: __init__() takes exactly 3 arguments (2 given) </code></pre> My code snippet is: <pre><code>def wait_for_run_process_to_finish(self): # When the process is running use WebdriverWait to check until the process has finished. No data to display is shown when process has completed. try: WebDriverWait(self.driver, 900).until( EC.text_to_be_present_in_element("No data to display")) no_data_to_display_element = self.get_element(By.ID, 'operations_monitoring_tab_current_ct_fields_no_data') print "no_data_to_display_element =" print no_data_to_display_element.text if no_data_to_display_element.text == "No data to display": return True except NoSuchElementException, e: print "Element not found " print e self.save_screenshot("wait_for_run_process_to_finish") </code></pre> The scenario is the user clicks the run button and it starts of a process. When the process completes the text "No data to display" will be shown. I would like to wait until this text is displayed then I know the process has completed. Before I was using time.sleep(900) which is not good as it explicitly waits the full 15 mins. The process could complete in 8 mins, sometimes 12 mins. I have also tried: <pre><code>WebDriverWait(self.driver, 900).until( EC.text_to_be_present_in_element(By.ID, 'operations_monitoring_tab_current_ct_fields_no_data', "No data to display")) </code></pre> The error shows: TypeError: init() takes exactly 3 arguments (4 given) What is the correct syntax to wait for the text to be present? Thanks, Riaz

40,238,766

2

0

null

2016-10-25 11:19:39.283 UTC

2

2018-11-21 10:14:11.373 UTC

2016-10-25 11:27:40.793 UTC

null

358,378

null

358,378

null

1

13

python|selenium|selenium-webdriver

40,664

The syntax you used for <code>EC.text_to_be_present_in_element("No data to display"))</code> is wrong. The syntax is: <pre><code>class selenium.webdriver.support.expected_conditions.text_to_be_present_in_element(locator, text_) </code></pre> <blockquote> An expectation for checking if the given text is present in the specified element. locator, text </blockquote> So, clearly, the locator is missing in your code in which the text to be checked. putting parenthesis also the issue you are facing (in the second edit). Use as follows (to add locator with correct parenthesis ): <pre><code>EC.text_to_be_present_in_element((By.ID, "operations_monitoring_tab_current_ct_fields_no_data"), "No data to display") </code></pre> Note: By.id is just an example. you can use any locator to identify the element supported by selenium

10,307,496

Is there a way or tutorial for converting Arduino code to C code?

I know that this question is general, but I couldn't find a tutorial or a good coding way to convert Arduino code (I mean the code that we are writing on Arduino software and it doesn't matter for <a href="http://arduino.cc/en/Main/ArduinoBoardUno">Arduino Uno</a> or <a href="http://en.wikipedia.org/wiki/List_of_Arduino_compatibles#Official_Arduino_versions">Mega</a> or ... ) even if a small sample. Is there a tutorial? I just want to learn the technique, and I know that it depends on the project.

10,307,530

3

0

null

2012-04-24 23:40:13.853 UTC

6

2020-07-07 00:22:26.477 UTC

2012-09-17 04:33:49.22 UTC

null

893

user1354921

null

1

9

c|embedded|arduino

38,052

Arduino code is, more or less, C code. The unique things that happen with Arduino is that the code is preprocessed (for example, they give simple hooks by establishing the <code>setup</code> and <code>loop</code> functions) and has a managed build/upload process that takes care of board limits, includes, libraries, etc... It is certainly possible to use the same toolkit yourself to build and run the code, that's how I do it. <a href="http://www.ashleymills.com/node/327" rel="noreferrer">Arduino and GCC, compiling and uploading programs using only makefiles</a> is the most useful link I've found covering the steps you need to get started. As I said, I've left the Arduino IDE and taken up the <code>avr-gcc</code> route myself, because if you know the GNU tools, you can do much more powerful things - like use the C++ standard libraries. I missed my <code>vector</code>s, what can I say. <a href="http://www.nongnu.org/avr-libc/" rel="noreferrer">avr-libc</a> is lagging quite a bit when it comes to full C++ functionality, making it hard to cram in the <a href="http://en.wikipedia.org/wiki/Standard_Template_Library" rel="noreferrer">STL</a>, but <a href="http://andybrown.me.uk/ws/2011/01/15/the-standard-template-library-stl-for-avr-with-c-streams/" rel="noreferrer">Andy Brown has gotten much of it working</a>. Throw those things together and you have quite a powerful development environment.

5,966,817

Difference between square brackets and curly brackets in Matlab?

A bit of a newbie question: whats the difference between square brackets <code>[]</code> and curly brackets <code>{}</code> in Matlab? When is it appropriate to use either? Update: its actually in the Matlab docs under "Special Characters".

5,966,949

2

1

null

2011-05-11 15:33:02.627 UTC

11

2019-12-05 08:47:49.583 UTC

2015-09-17 23:06:41.807 UTC

user616736

107,409

null

107,409

null

1

31

matlab

56,281

A square bracket creates a vector or matrix, whereas curly brackets creates a cell array. When working with numbers, I'd say that 99% of the time, you will use square brackets. Cell arrays allow you to store different types of data at each location, e.g. a 10x5 matrix at (1,1), a string array at (1,2), ... <pre><code>x = [1 2 3]; #% matrix with values 1, 2, 3 y = {1, 'a', x}; #% cell array storing a number, a character, and 1x3 matrix </code></pre> Here is the MATLAB documentation on cell arrays: <a href="http://www.mathworks.com/help/matlab/cell-arrays.html" rel="noreferrer">http://www.mathworks.com/help/matlab/cell-arrays.html</a>

19,423,827

write an ng-pattern to disallow whitespaces and special characters

I am trying to get an angular ng-pattern to check that a username has no whitespaces or special characters. The following form return false if you enter whitespaces or special characters. However, it becomes true as soon as you enter a-z, A-z or 0-9. I have tried ng-pattern="/[^\s]+/" and \S and [^ ] but they make no difference. <pre><code><form name="myform"> valid? {{ myform.$valid }} <input type="text" name="username" ng-model="username" ng-pattern="/[a-zA-Z0-9^ ]/" required/> </form> </code></pre> Here's the form in a plunk: <a href="http://plnkr.co/edit/6T78kyUgXYfNAwB4RHKQ?p=preview">http://plnkr.co/edit/6T78kyUgXYfNAwB4RHKQ?p=preview</a>

19,424,059

3

0

null

2013-10-17 10:09:42.55 UTC

7

2018-09-11 12:56:20.987 UTC

null

2,326,620

null

1

22

regex|angularjs

64,731

Try the following pattern: <pre><code>/^[a-zA-Z0-9]*$/ </code></pre> This allows only alphanumeric characters.

21,607,745

specific config by environment in Scala

What is a good way to set up a project in Scala which uses different configuration depending on environments. I need to specifically have different databases for development, test and production environment (similar to what is done in Rails)

33,261,928

3

0

null

2014-02-06 15:56:52.35 UTC

17

2018-05-08 22:08:36.737 UTC

null

105,514

null

1

34

scala|configuration|environment-variables|config|development-environment

29,119

Another strategy I'm using consists of using <a href="https://github.com/typesafehub/config/blob/master/HOCON.md#includes" rel="noreferrer">includes</a>. I usually store my DEV settings in the <a href="https://github.com/typesafehub/config#standard-behavior" rel="noreferrer">default</a> <code>application.conf</code> file then I create a new conf file for other environments and include the default one. Let's say my DEV conf <code>application.conf</code> looks like this: <pre><code>myapp { server-address = "localhost" server-port = 9000 some-other-setting = "cool !" } </code></pre> Then for the PROD, I could have another file called <code>prod.conf</code>: <pre><code>include "application" # override default (DEV) settings myapp { server-address = ${PROD_SERVER_HOSTNAME} server-port = ${PROD_SERVER_PORT} } </code></pre> Note that I override only the settings that change in the PROD environment (<code>some-other-setting</code> is thus the same as in DEV). The config bootstrap code doesn't test anything <pre><code>... val conf = ConfigFactory.load() ... </code></pre> To switch from the DEV to the PROD conf, simply pass a system property with the name of the config file to load: <pre><code>java -Dconfig.resource=prod.conf ... </code></pre> In DEV, no need to pass it since <code>application.conf</code> will be loaded by <a href="https://github.com/typesafehub/config#standard-behavior" rel="noreferrer">default</a>. So here we're using <a href="https://lightbend.github.io/config" rel="noreferrer">Typesafe Config</a>'s default loading mechanism to achieve this. I've created a simple <a href="https://github.com/ozeebee/test-scala-config" rel="noreferrer">project</a> to demonstrate this technique. Feel free to clone and experiment.

48,869,915

Angular - Material: Progressbar custom color?

I am now trying for hours. I use Material2 and simply want to change the color of the progress-bar. I know there are those themes (primary/accent/warn) but I want to have a custom color (green) for my progressbar. I already tried the weirdest css-combinations.. but with no effort. Maybe someone had the same problem?

48,870,180

12

2

null

2018-02-19 16:06:45.13 UTC

9

2022-06-10 06:09:35.65 UTC

2021-10-29 19:52:42.177 UTC

null

114,029

null

9,177,588

null

1

27

css|angular|angular-material|progress-bar

58,988

I can suggest to change one of the premade primary/warn/accent colors to your custom color. In your <code>styles.scss</code> (if your style file is css you will have to change it to support scss): <pre><code> @import '~@angular/material/theming'; // Plus imports for other components in your app. // Include the common styles for Angular Material. We include this here so that you only // have to load a single css file for Angular Material in your app. // Be sure that you only ever include this mixin once! @include mat-core(); // Define the palettes for your theme using the Material Design palettes available in palette.scss // (imported above). For each palette, you can optionally specify a default, lighter, and darker // hue. $mat-blue: ( 50: #e3f2fd, 100: #bbdefb, 200: #90caf9, 300: #64b5f6, 400: #42a5f5, 500: #2196f3, 600: #1e88e5, 700: #1976d2, 800: #1565c0, 900: #0d47a1, A100: #82b1ff, A200: #448aff, A400: #2979ff, A700: #2B66C3, contrast: ( 50: $black-87-opacity, 100: $black-87-opacity, 200: $black-87-opacity, 300: $black-87-opacity, 400: $black-87-opacity, 500: white, 600: white, 700: white, 800: $white-87-opacity, 900: $white-87-opacity, A100: $black-87-opacity, A200: white, A400: white, A700: white, ) ); $candy-app-primary: mat-palette($mat-blue, A700); $candy-app-accent: mat-palette($mat-orange, A200, A100, A400); // The warn palette is optional (defaults to red). $candy-app-warn: mat-palette($mat-red); // Create the theme object (a Sass map containing all of the palettes). $candy-a-theme($candy-app-theme); pp-theme: mat-light-theme($candy-app-primary, $candy-app-accent, $candy-app-warn); // Include theme styles for core and each component used in your app. // Alternatively, you can import and @include the theme mixins for each component // that you are using. @include angular-material </code></pre>

8,493,978

CommandArgument in the Gridview

I have a gridview like this. <pre><code><asp:GridView ID="grdMerchant" runat="server" GridLines="None" HeaderStyle-Font-Bold="True" AutoGenerateColumns="False" AllowSorting="True" ShowHeader="false" OnRowDataBound="grdMerchant_RowDataBound" OnRowCommand="grdMerchant_RowCommand" DataKeyNames="OrderID" style="table-layout:auto;width:100%;" > <asp:TemplateField > <ItemTemplate> <asp:Linkbutton ID= "btnView" runat="server" Text="View" OnClick="btnView_OnClick" CommandArgument='<%#Eval("OrderID")%>' ></asp:Linkbutton> </code></pre> How do i have to get the OrderID of the selected row. I tried using <pre><code>int OrderID = (int)grdMerchant.DataKeys[row.RowIndex][2]; </code></pre> But it gets null and i know this is not the way. Help me. Thank you in advance!

8,494,074

1

0

null

2011-12-13 18:07:11.36 UTC

null

2016-05-15 08:58:24.983 UTC

null

397,062

null

1

12

c#|asp.net|gridview

45,346

try like this <pre><code> <asp:GridView ID="grd1" runat="Server" width="500px" AutoGenerateColumns="false" DataKeyNames="StateID" OnRowEditing="grd1_RowEditing"> <Columns> <asp:TemplateField> <ItemTemplate> <asp:LinkButton ID="btnDelete" runat="server" CommandArgument='<%#Eval("StateID")%>' OnCommand="lnkDelete" Text="Delete"> </asp:LinkButton> </ItemTemplate> </asp:TemplateField> </Columns> </code></pre> <pre><code> protected void lnkDelete(Object sender, CommandEventArgs e) { int iStID=int32.Parse(e.CommandArgument.ToString()); } //iStID has the DataKey value which you can use. </code></pre>

8,591,887

jQuery get parent sibling for this element only

I cant figure out how to write this. See my mark up structure, which is repeated multiple times on a page. <pre><code><div class="module"> <div class="archive-info"> open </div> <div class="archive-meta-slide"> </div> </div> </code></pre> As you can see inside my mark-up, I have a <code></code> which is my <code>$metaButton</code> - when this is clicked, it runs the animation on the <code>div.archive-meta-slide</code> - this is simple enough, but I'm trying to run the animation only on the current <code>div.module</code> it animates all the divs with the class <code>"archive-meta-slide"</code>, and I'm really struggling to animate only the current <code>div.archive-meta-slide</code> using <code>this</code> It would be easy if the <code>div.archive-meta-slide</code> was inside the parent div of <code>$metaButton</code>, but because it's outside this parent div, I can't get the traversing right. See my script <pre><code>var $metaButton = $("span.archive-meta"), $metaSlide = $(".archive-meta-slide"); $metaButton.toggle( function() { $(this).parent().siblings().find(".archive-meta-slide").animate({ height: "0" }, 300); $(this).parent().siblings().find(".archive-meta-slide").html("close"); }, function() { $(this).parent().siblings().find(".archive-meta-slide").animate({ height: "43px" }, 300); $(this).parent().siblings().find(".archive-meta-slide").html("open"); }); </code></pre> Can anyone help? Thanks Josh

8,591,924

6

0

null

2011-12-21 15:02:51.133 UTC

4

2015-07-22 13:45:28.613 UTC

null

801,773

null

1

23

javascript|jquery|traversal

55,050

<pre><code>$(this).parent().siblings().find(".archive-meta-slide") </code></pre> This is really close. This actually says "find elements with the class <code>archive-meta-slide</code> that are descendants of siblings of this element's parent". You want to say "find elements with the class <code>archive-meta-slide</code> that are siblings of this element's parent". For that, use a selector on the <code>siblings</code> call: <pre><code>$(this).parent().siblings(".archive-meta-slide") </code></pre> Note that, if the markup is always this structure, you could even do <code>$(this).parent().next()</code>. See the jQuery API: <ul> <li><a href="http://api.jquery.com/siblings" rel="noreferrer"><code>siblings</code></a></li> <li><a href="http://api.jquery.com/find" rel="noreferrer"><code>find</code></a></li> <li><a href="http://api.jquery.com/next" rel="noreferrer"><code>next</code></a></li> </ul>

8,857,705

Deleting the first two lines of a file using BASH or awk or sed or whatever

I'm trying to delete the first two lines of a file by just not printing it to another file. I'm not looking for something fancy. Here's my (failed) attempt at awk: <pre><code>awk '{ (NR > 2) {print} }' myfile </code></pre> That throws out the following error: <pre><code>awk: { NR > 2 {print} } awk: ^ syntax error </code></pre> Example: contents of 'myfile': <pre><code>blah blahsdfsj 1 2 3 4 </code></pre> What I want the result to be: <pre><code>1 2 3 4 </code></pre>

8,857,734

4

0

null

2012-01-13 21:51:24.043 UTC

10

2014-10-26 18:26:44.163 UTC

null

2,246,344

null

381,798

null

1

39

bash|awk|sed|lines

75,230

Use tail: <pre><code>tail -n+3 file </code></pre> from the man page: <pre><code> -n, --lines=K output the last K lines, instead of the last 10; or use -n +K to output lines starting with the Kth </code></pre>

8,545,553

Best way to debug third-party gems in ruby

Since there may be a lot of Ghost Methods inside a ruby gem, I don't think it is a good idea to study the inner mechanism of a ruby gem just by reading its source code statically. Is there a way to attach the source file of a third-part gem to a running ruby process for debugging so that I can set break point and see how things work dynamically ? BTW,I've tried to navigate to the source file of a third-part gem in RubyMine by clicking on the context menu "Go To->Implementations" of the 'require' statement or other symbol of an third-part gem( <code>require 'watir'</code> for example ), without success. Is it normal for an IDE of a dynamic typing language such as Ruby to fail a symbol navigation?

8,545,814

5

0

null

2011-12-17 14:58:07.96 UTC

18

2020-11-27 18:12:58.627 UTC

2013-07-31 18:49:44.093 UTC

null

167,614

null

872,319

null

1

42

ruby|debugging|ide

18,471

I would love to know if there's a better way to do this, but how I usually do it is: <ol> <li>Add the ruby-debug gem to your Gemfile (or ruby-debug19 if you're on Ruby 1.9.2)</li> <li>Find the Gem by doing <code>bundle show gemname</code>. I'm on a Mac so I usually pipe this to pbcopy so it gets copied to my clipboard. <code>bundle show rails | pbcopy</code></li> <li>Open the gem directory in your favorite editor. <code>mvim /path/to/gem/directory</code></li> <li>Navigate to the file and line where you want to put the breakpoint* and insert <code>debugger</code> above the line in question.</li> <li>Reload page, run test, or do whatever you would to get the Gem file to execute</li> <li>When execution stops at debugger, you can inspect variables (<code>p variable_name</code>), and move line by line with the <a href="http://bashdb.sourceforge.net/ruby-debug.html#Command-Index">ruby debugger commands</a>.</li> </ol> *Knowing where to put the breakpoint can take some understanding of the code, but you should start in lib/gemname.rb

8,867,496

Get last image from Photos.app?

I have seen other apps do it where you can import the last photo from the Photos app for quick use but as far as I know, I only know how to get A image and not the last (most recent one). Can anyone show me how to get the last image?

8,872,425

13

0

null

2012-01-15 04:17:38.977 UTC

52

2016-12-02 14:12:15.687 UTC

2012-01-20 17:05:01.23 UTC

null

237,838

null

394,736

null

1

55

ios|image|camera|photos

25,845

This code snippet will get the latest image from the camera roll (iOS 7 and below): <pre><code>ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init]; // Enumerate just the photos and videos group by using ALAssetsGroupSavedPhotos. [library enumerateGroupsWithTypes:ALAssetsGroupSavedPhotos usingBlock:^(ALAssetsGroup *group, BOOL *stop) { // Within the group enumeration block, filter to enumerate just photos. [group setAssetsFilter:[ALAssetsFilter allPhotos]]; // Chooses the photo at the last index [group enumerateAssetsWithOptions:NSEnumerationReverse usingBlock:^(ALAsset *alAsset, NSUInteger index, BOOL *innerStop) { // The end of the enumeration is signaled by asset == nil. if (alAsset) { ALAssetRepresentation *representation = [alAsset defaultRepresentation]; UIImage *latestPhoto = [UIImage imageWithCGImage:[representation fullScreenImage]]; // Stop the enumerations *stop = YES; *innerStop = YES; // Do something interesting with the AV asset. [self sendTweet:latestPhoto]; } }]; } failureBlock: ^(NSError *error) { // Typically you should handle an error more gracefully than this. NSLog(@"No groups"); }]; </code></pre> iOS 8 and above: <pre><code>PHFetchOptions *fetchOptions = [[PHFetchOptions alloc] init]; fetchOptions.sortDescriptors = @[[NSSortDescriptor sortDescriptorWithKey:@"creationDate" ascending:YES]]; PHFetchResult *fetchResult = [PHAsset fetchAssetsWithMediaType:PHAssetMediaTypeImage options:fetchOptions]; PHAsset *lastAsset = [fetchResult lastObject]; [[PHImageManager defaultManager] requestImageForAsset:lastAsset targetSize:self.photoLibraryButton.bounds.size contentMode:PHImageContentModeAspectFill options:PHImageRequestOptionsVersionCurrent resultHandler:^(UIImage *result, NSDictionary *info) { dispatch_async(dispatch_get_main_queue(), ^{ [[self photoLibraryButton] setImage:result forState:UIControlStateNormal]; }); }]; </code></pre>

47,556,287

May a destructor be final?

Does the C++ standard allow a destructor to be declared as <code>final</code>? Like this: <pre><code> class Derived: public Base { ... virtual ~Derived() final; } </code></pre> And if so, does that prevent the declaration of a derived class: <pre><code> class FurtherDerived: public Derived {// allowed? } </code></pre> If it is allowed, is a compiler likely to issue a warning? Is declaring a destructor to be <code>final</code> a workable idiom for indicating that a class is not intended to be used as a base class? (There is <a href="https://stackoverflow.com/questions/11704406/whats-the-point-of-a-final-virtual-function">no point in doing this in a ultimate base class</a>, only a derived class.)

47,556,411

1

2

null

2017-11-29 15:27:11.947 UTC

6

2017-11-29 16:02:28.21 UTC

null

545,127

null

545,127

null

1

41

c++|c++11|inheritance|destructor

5,570

<blockquote> May a C++ destructor be declared as <code>final</code>? </blockquote> Yes. <blockquote> And if so, does that prevent declaration of a derived class: </blockquote> Yes, because the derived class would have to declare a destructor (either explicitly by you or implicitly by the compiler), and that destructor would be overriding a function declared <code>final</code>, which is ill-formed. The rule is <a href="http://eel.is/c++draft/class.derived#class.virtual-4.sentence-1" rel="noreferrer">[class.virtual]/4</a>: <blockquote> If a virtual function <code>f</code> in some class B is marked with the virt-specifier <code>final</code> and in a class D derived from B a function <code>D::f</code> overrides <code>B::f</code>, the program is ill-formed. </blockquote> It's the derivation itself that is ill-formed, it doesn't have to be used. <blockquote> Is declaring a destructor to be final a workable idiom for indicating that a class is not intended to be used as a base class? </blockquote> Effectively, but you should just mark the class <code>final</code>. It's quite a bit more explicit.

1,090,274

How can I set the default value in a SharePoint list field, based on the value in another field?

I have a custom list in SharePoint (specifically, MOSS 2007.) One field is a yes/no checkbox titled "Any defects?" Another field is "Closed by" and names the person who has closed the ticket. If there are no defects then I want the ticket to be auto-closed. If there are, then the "Closed by" field ought to be filled in later on. I figured I could set a calculated default value for "Closed by" like this: <pre><code>=IF([Any defects?],"",[Me]) </code></pre> but SharePoint complains I have referenced a field. I suppose this makes sense; the default values fire when the new list item is first opened for entry and there are no values in any fields yet. I understand it is possible to make a calculated field based on a column value but in that case the field cannot be edited later. Does anyone have any advice how to achieve what I am trying to do? Is it possible to have a "OnSubmit" type event that allows me to execute some code at the point the list item is saved? Thank you.

1,090,638

3

0

null

2009-07-07 03:42:41.993 UTC

2

2009-10-02 12:04:23.11 UTC

null

74,068

null

1

3

sharepoint

53,954

Include a content editor web part in the page (newform.aspx / editform.aspx) and use jQuery (or just plain javascript) to handle the setting of default values. Edit: some example code: In the lists newform.aspx, include a reference to jquery. If you look at the html code, you can see that each input tag gets an id based on the field's GUID, and a title that's set to the fields display name. now, using jquery we can get at these fields using the jQuery selector like this: By title: <pre><code>$("input[title='DISPLAYNAMEOFFIELD']"); </code></pre> by id (if you know the field's internal guid, the dashes will ahve to be replaced by underscores: <pre><code>// example field id, notice the guid and the underscores in the guid ctl00_m_g_054db6a0_0028_412d_bdc1_f2522ac3922e_ctl00_ctl04_ctl15_ctl00_ctl00_ctl04_ctl00_ctl00_TextField $("input[id*='GUID']"); //this will get all input elements of which the id contains the specified GUID, i.e. 1 element </code></pre> We wrap this in the <code>ready()</code> function of jQuery, so all calls will only be made when the document has fully loaded: <pre><code>$(document).ready(function(){ // enter code here, will be executed immediately after page has been loaded }); </code></pre> By combining these 2 we could now set your dropdown's <code>onchange</code> event to the following <pre><code>$(document).ready(function(){ $("input[title='DISPLAYNAMEOFFIELD']").change(function() { //do something to other field here }); }); </code></pre>

695,802

Using SSL and SslStream for peer to peer authentication?

I need to provide secure communication between various processes that are using TCP/IP sockets for communication. I want both authentication and encryption. Rather than re-invent the wheel I would really like to use SSL and the SslStream class and self-signed certificates. What I want to do is validate the remote process's certificate against a known copy in my local application. (There doesn't need to be a certificate authority because I intend for the certificates to be copied around manually). To do this, I want the application to be able to automatically generate a new certifiate the first time it is run. In addition to makecert.exe, it looks like <a href="http://blogs.msdn.com/dcook/archive/2008/11/25/creating-a-self-signed-certificate-in-c.aspx" rel="noreferrer">this link</a> shows a way to automatically generate self-signed certificates, so that's a start. I've looked at the AuthenticateAsServer and AuthenticateAsClient methods of SslStream. You can provide call-backs for verification, so it looks like it's possible. But now that I'm into the details of it, I really don't think it's possible to do this. Am I going in the right direction? Is there a better alternative? Has anyone done anything like this before (basically peer-to-peer SSL rather than client-server)?

699,922

3

0

null

2009-03-30 01:56:43.483 UTC

26

2014-03-03 18:08:52.623 UTC

null

Scott W.

17,635

null

1

18

c#|ssl|ssl-certificate|sslstream

29,790

Step 1: Generating a self-signed certificate: <ul> <li>I downloaded the <a href="http://blogs.msdn.com/dcook/archive/2008/11/25/creating-a-self-signed-certificate-in-c.aspx" rel="noreferrer">Certificate.cs class</a> posted by Doug Cook</li> <li>I used this code to generate a .pfx certificate file: <pre><code>byte[] c = Certificate.CreateSelfSignCertificatePfx( "CN=yourhostname.com", //host name DateTime.Parse("2000-01-01"), //not valid before DateTime.Parse("2010-01-01"), //not valid after "mypassword"); //password to encrypt key file using (BinaryWriter binWriter = new BinaryWriter( File.Open(@"testcert.pfx", FileMode.Create))) { binWriter.Write(c); } </code></pre></li> </ul> Step 2: Loading the certificate <pre><code> X509Certificate cert = new X509Certificate2( @"testcert.pfx", "mypassword"); </code></pre> Step 3: Putting it together <ul> <li>I based it on <a href="http://leastprivilege.com/2005/02/28/sslstream-sample/" rel="noreferrer">this very simple SslStream example</a></li> <li>You will get a compile time error about the SslProtocolType enumeration. Just change that from SslProtocolType.Default to SslProtocols.Default</li> <li>There were 3 warnings about deprecated functions. I replaced them all with the suggested replacements.</li> <li>I replaced this line in the Server Program.cs file with the line from Step 2: X509Certificate cert = getServerCert();</li> <li>In the Client Program.cs file, make sure you set serverName = yourhostname.com (and that it matches the name in the certificate)</li> <li>In the Client Program.cs, the CertificateValidationCallback function fails because sslPolicyErrors contains a RemoteCertificateChainErrors. If you dig a little deeper, this is because the issuing authority that signed the certificate is not a trusted root.</li> <li>I don`t want to get into having the user import certificates into the root store, etc., so I made a special case for this, and I check that certificate.GetPublicKeyString() is equal to the public key that I have on file for that server. If it matches, I return True from that function. That seems to work.</li> </ul> Step 4: Client Authentication Here's how my client authenticates (it's a little different than the server): <pre><code>TcpClient client = new TcpClient(); client.Connect(hostName, port); SslStream sslStream = new SslStream(client.GetStream(), false, new RemoteCertificateValidationCallback(CertificateValidationCallback), new LocalCertificateSelectionCallback(CertificateSelectionCallback)); bool authenticationPassed = true; try { string serverName = System.Environment.MachineName; X509Certificate cert = GetServerCert(SERVER_CERT_FILENAME, SERVER_CERT_PASSWORD); X509CertificateCollection certs = new X509CertificateCollection(); certs.Add(cert); sslStream.AuthenticateAsClient( serverName, certs, SslProtocols.Default, false); // check cert revokation } catch (AuthenticationException) { authenticationPassed = false; } if (authenticationPassed) { //do stuff } </code></pre> The CertificateValidationCallback is the same as in the server case, but note how AuthenticateAsClient takes a collection of certificates, not just one certificate. So, you have to add a LocalCertificateSelectionCallback, like this (in this case, I only have one client cert so I just return the first one in the collection): <pre><code>static X509Certificate CertificateSelectionCallback(object sender, string targetHost, X509CertificateCollection localCertificates, X509Certificate remoteCertificate, string[] acceptableIssuers) { return localCertificates[0]; } </code></pre>

1,080,479

How to make DockPanel fill available space

I'm trying the content of a shopping cart in an <code>ItemsControl(ListBox)</code>. To do so, I've created the following <code>DataTemplate</code>: <pre><code><DataTemplate x:Key="Templates.ShoppingCartProduct" DataType="{x:Type viewModel:ProductViewModel}"> <DockPanel HorizontalAlignment="Stretch"> <TextBlock DockPanel.Dock="Left" Text="{Binding Path=Name}" FontSize="10" Foreground="Black" /> <TextBlock DockPanel.Dock="Right" Text="{Binding Path=Price, StringFormat=\{0:C\}}" FontSize="10" Foreground="Black" /> </DockPanel> </DataTemplate> </code></pre> When the items are displayed in my shopping cart however, the Name and Price <code>TextBlocks</code> are sitting right beside one another, and there is an extremely large amount of whitespace on the right hand side. Was wondering what the best method to force the <code>DockPanel</code> to stretch to fill all the space made available by the <code>ListItem</code> was?

1,080,488

3

0

null

2009-07-03 18:59:52.163 UTC

6

2015-03-03 13:49:36.46 UTC

2011-08-04 21:14:11.823 UTC

null

305,637

null

5,086

null

1

24

.net|wpf|autosize|dockpanel

63,003

Bind the <code>Width</code> of the <code>DockPanel</code> to the <code>ActualWidth</code> of the <code>ListBoxItem</code>: <pre><code><DockPanel Width="{Binding ActualWidth, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ListBoxItem}}}"> ... </code></pre> Another option: you could just redefine the <code>ItemContainerStyle</code> so that the <code>ListBoxItem</code> is stretched horizontally: <pre><code><ListBox.ItemContainerStyle> <Style TargetType="ListBoxItem"> <Setter Property="HorizontalContentAlignment" Value="Stretch"/> </Style> </ListBox.ItemContainerStyle> </code></pre>

28,643,573

How to set an environment variable in Amazon EC2

I created a tag on the AWS console for one of my EC2 instances. <img src="https://i.stack.imgur.com/1MxjO.png" alt="enter image description here"> However, when I look on the server, no such environment variable is set. The same thing works with elastic beanstalk. <code>env</code> shows the tags I created on the console. <pre><code>$ env [...] DB_PORT=5432 </code></pre> How can I set environment variables in Amazon EC2?

28,649,865

5

1

null

2015-02-21 08:02:26.133 UTC

16

2021-11-05 12:01:01.93 UTC

null

1,514,990

null

1

49

amazon-web-services|amazon-ec2|debian|environment-variables

107,421

Following the instructions given by <a href="https://stackoverflow.com/users/179529/guy">Guy</a>, I wrote a small shell script. This script uses AWS CLI and <code>jq</code>. It lets you import your AWS instance and AMI tags as shell environment variables. I hope it can help a few people. <a href="https://github.com/12moons/ec2-tags-env" rel="nofollow">https://github.com/12moons/ec2-tags-env</a>

24,409,703

How to uninstall java from command line independent of version currently installed in machine?

hi i have to write a command line to uninstall java where it get current version already installed in system ?(suppose one system having jre-6u29 where other having jre-7).But i want single command line to uninstall existing version.please help me.

24,410,295

2

0

null

2014-06-25 13:12:47.953 UTC

4

2020-08-07 07:41:46.247 UTC

null

3,770,462

null

1

5

cmd

43,430

I have not tested this. Use with EXTREME caution. It WILL NOT prompt for confirmation, and it WILL NOT let you cancel your action Open a command prompt using administrator rights, and type in: <pre><code>wmic product where "name like 'Java%'" call uninstall </code></pre> What this simple command is doing is: <ul> <li>Find all the products installed on your computer which name starts with "Java"</li> <li>Uninstalls them without asking for confirmation, nor showing any kind of user interface</li> </ul>

24,248,098

AngularJS dynamic form from json data (different types)

I try to create a dynamic form in AngularJS using the data from a JSON. I have this working: HTML <pre><code> <input dynamic-name="field.name" type="{{ field.type }}" placeholder="{{ field.name }}" ng-model="field.value" required > Required! Not email! <button ng-disabled="myForm.$invalid">Submit</button> </form> </code></pre> JS <pre><code>angular.module('angularTestingApp').controller('DynamicFormCtrl', function ($scope) { $scope.formFields = [ { name: 'firstName', type: 'text' }, { name: 'email', type: 'email' }, { name: 'password', type: 'password' }, { name: 'secondName', type: 'text' } ];}).directive("dynamicName",function($compile){ return { restrict:"A", terminal:true, priority:1000, link:function(scope,element,attrs){ element.attr('name', scope.$eval(attrs.dynamicName)); element.removeAttr("dynamic-name"); $compile(element)(scope); } }}); </code></pre> This code works, but the question is that I dont know how to add dynamic checkbox or checklist and how can I validate inside the form, something like this: <pre><code>angular.module('angularTestingApp') </code></pre> .controller('DynamicFormCtrl', function ($scope) { <pre><code>$scope.formFields = [ { name: 'firstName', type: 'text' }, { name: 'email', type: 'email' }, { name: 'password', type: 'password' }, { name: 'city', type: 'checkbox', choices: [ { name: "red" }, { name: "blue" }, { name: "green" }, ] } ];}) </code></pre> Thank you in advance for your attention. Best Regards!

24,290,468

3

0

null

2014-06-16 16:19:10.527 UTC

16

2018-04-10 07:46:19.227 UTC

null

3,593,067

null

1

28

javascript|json|forms|angularjs|dynamic-data

46,526

I have solved my problem. This a plunkr link with one example of Dynamic Forms with Validation in AngularJS <a href="http://plnkr.co/edit/kqiheTEoGDQxAoQV3wxu?p=preview" rel="noreferrer">http://plnkr.co/edit/kqiheTEoGDQxAoQV3wxu?p=preview</a> .html <pre><code> <form name="myForm" class="form-horizontal" role="form" ng-submit="submitForm()"> <div ng-repeat="field in entity.fields"> <ng-form name="form">  <div ng-if="field.type=='text'" class="form-group"> <label class="col-sm-2 control-label">{{field.label}}</label> <div class="col-sm-6"> <input type="{{ field.type }}" dynamic-name="field.name" id="{{field.name}}" data-ng-model="field.data" class="form-control" required/>  Required! </div> </div>  <div ng-if="field.type=='email'" class="form-group"> <label class="col-sm-2 control-label">{{field.label}}</label> <div class="col-sm-6"> <input type="{{ field.type }}" dynamic-name="field.name" data-ng-model="field.data" class="form-control" required/> Required! Not email! </div> </div>  <div ng-if="field.type=='password'" class="form-group" > <label class="col-sm-2 control-label">{{field.label}}</label> <div class="col-sm-6"> <input type="{{ field.type }}" dynamic-name="field.name" data-ng-model="field.data" ng-minlength={{field.min}} ng-maxlength={{field.max}} class="form-control" required/> Required! Passwords must be between 8 and 20 characters. </div> </div>  <div ng-if="field.type=='select'" class="form-group" > <label class="col-sm-2 control-label">{{field.label}}</label> <div class="col-sm-6"> <select data-ng-model="field.data" ng-options="option.name for option in field.options" class="form-control" required/> </div> </div>  <div ng-if="field.type=='radio'" class="form-group"> <label class="col-sm-2 control-label">{{field.label}}</label> <div class="col-sm-6"> <div class="checkbox" ng-repeat="option in field.options" > <label> <input type="radio" data-ng-model="field.data" name="taskGroup" id="{{option.name}}" value="{{option.id}}">{{option.name}} </label> </div> </div> </div>  <div ng-if="field.type=='checkbox'" class="form-group" > <label class="col-sm-2 control-label">{{field.label}}</label> <div class="col-sm-6"> <div class="checkbox" ng-repeat="option in field.options" > <label> <input type="checkbox" data-ng-model="option.data" name="taskGroup" id="{{option.name}}" value="{{option.id}}" >{{option.name}} </label> </div> </div> </div> </ng-form> </div> <button ng-disabled="myForm.$invalid" type="submit" id="submit">Submit</button> <pre>{{entity|json}}</pre> </form> </code></pre> .js <pre><code>app.controller('DynamicFormController', function ($scope, $log) { // we would get this from the api $scope.entity = { name : "Course", fields : [ {type: "text", name: "firstname", label: "Name" , required: true, data:""}, {type: "radio", name: "color_id", label: "Colors" , options:[{id: 1, name: "orange"},{id: 2, name: "pink"},{id: 3, name: "gray"},{id: 4, name: "cyan"}], required: true, data:""}, {type: "email", name: "emailUser", label: "Email" , required: true, data:""}, {type: "text", name: "city", label: "City" , required: true, data:""}, {type: "password", name: "pass", label: "Password" , min: 6, max:20, required: true, data:""}, {type: "select", name: "teacher_id", label: "Teacher" , options:[{name: "Mark"},{name: "Claire"},{name: "Daniel"},{name: "Gary"}], required: true, data:""}, {type: "checkbox", name: "car_id", label: "Cars" , options:[{id: 1, name: "bmw"},{id: 2, name: "audi"},{id: 3, name: "porche"},{id: 4, name: "jaguar"}], required: true, data:""} ] }; $scope.submitForm = function(){ $log.debug($scope.entity); } }) .directive("dynamicName",function($compile){ return { restrict:"A", terminal:true, priority:1000, link:function(scope,element,attrs){ element.attr('name', scope.$eval(attrs.dynamicName)); element.removeAttr("dynamic-name"); $compile(element)(scope); } } }) </code></pre>

36,119,358

React Native: Command `run-ios` unrecognized

I have two different ReactNative-Projects: <ul> <li>a) a project from januar 2016 </li> <li>b) a complete new react-native project from now (march 20th 2016)</li> </ul> Within the new project the cli tool of react-native contains the command "run-ios" next two "run-android", but not on the older project from januar 2016. On the older one there is not "run-ios" command available: <pre><code>$ react-native run-ios Command `run-ios` unrecognized Usage: react-native <command> </code></pre> I already ran "react-native upgrade" without any issues. How can i get the command "run-ios" also in older projects?

36,126,924

15

1

null

2016-03-20 20:45:54.333 UTC

15

2021-07-28 00:30:54.113 UTC

null

4,769,503

null

1

72

react-native

59,864

Just update the version of react native in your project with the following command: <pre><code>$> npm install --save react-native@latest </code></pre>

6,240,330

Memory alignment check

I want to check whether an allocated memory is aligned or not. I am using <code>_aligned_malloc(size, align);</code> And it returns a pointer. Can I check it by simply dividing the pointer content by 16 for example? If the the pointer content is divisible by 16, does it mean that the memory is aligned by 16 bytes?

6,240,348

3

4

null

2011-06-05 00:54:41.017 UTC

9

2011-06-06 01:11:41.227 UTC

null

659,401

null

1

19

c|visual-studio

13,644

An "aligned" pointer by definition means that the numeric value of the pointer is evenly divisible by N (where N is the desired alignment). To check this, cast the pointer to an integer of suitable size, take the modulus N, and check whether the result is zero. In code: <pre><code>bool is_aligned(void *p, int N) { return (int)p % N == 0; } </code></pre> If you want to check the pointer value by hand, just look at the hex representation of the pointer and see whether it ends with the required number of 0 bits. A 16 byte aligned pointer value will always end in four zero bits, for example.

5,901,661

wget + JavaScript?

I have this webpage that uses client-side JavaScript to format data on the page before it's displayed to the user. Is it possible to somehow use <code>wget</code> to download the page and use some sort of client-side JavaScript engine to format the data as it would be displayed in a browser?

5,901,700

3

null

2011-05-05 17:16:06.01 UTC

6

2015-12-09 09:52:21.84 UTC

2015-12-02 20:42:31.443 UTC

null

1,245,190

null

172,350

null

1

35

javascript|html|browser|wget

62,618

You could probably make that happen with something like <a href="http://phantomjs.org/" rel="noreferrer">PhantomJS</a> You can write a phantomjs script that will load the page like a browser would, and then either take screenshots or use JS to inspect the page and pull out data.

5,614,739

Is there some "Feature Graphic" generator for Google Play?

I'm looking for some "Feature Graphic" online generator. Feature Graphic is the big image displayed in the web-based Android Market. It could be something simple and it could look like one for this app: <a href="https://market.android.com/details?id=menion.android.locus" rel="noreferrer">https://market.android.com/details?id=menion.android.locus</a> I would input screenshots, title and some slogan and it would generate nice feature graphic. I think many Android developers would appreciate such service.

25,624,308

3

null

2011-04-10 21:08:09.53 UTC

11

2014-09-03 13:30:18.153 UTC

null

560,358

null

560,358

null

1

52

android|google-play

41,930

As of 31st Aug 2014 feature graphic is mandatory and handily there's a generator Created by Litrik De Roy <a href="http://www.norio.be/android-feature-graphic-generator/">here</a>. <blockquote> The Android Feature Graphic Generator allows you to easily create a simple yet attractive feature graphic for your Android application. It will generate a PNG image file according to Google's guidelines. Afterwards you can upload the image to the Google Play Developer Console to spice up the listing of your Android app. </blockquote>

5,953,263

Setting a height in CSS for an unordered list?

I've got a list here for my page's footer, that I want displayed horizontally. But because I've turned it into an inline list to go horizontally, the background images get cut off vertically. The biggest one is 27px high. So I'm stuck.. I know why the following is doing what it's doing. But how do I get around it? Here's the html: <pre><code><div id="footer"> <ul> <li id="footer-tmdb"><a href="">Film data courtesy of TMDB</a></li> <li id="footer-email"><a href="">Contact Us</a></li> <li id="footer-twitter"><a href="">Follow Us</a></li> </ul> </div> </code></pre> and the CSS: <pre><code>#footer ul { height: 27px; } #footer ul li { display: inline; list-style: none; margin-right: 20px; } #footer-tmdb { background: url('../images/logo-tmdb.png') no-repeat 0 0; padding-left: 140px; } #footer-email { background: url('../images/icon-email.png') no-repeat 0 3px; padding-left: 40px; } #footer-twitter { background: url('../images/icon-twitter.png') no-repeat 0 0; padding-left: 49px; } </code></pre> Here's what it looks like: <img src="https://i.stack.imgur.com/uXVVH.jpg" alt="footer"> As you can see, half of the images are cut off. The simpler the solution, the better, please.

5,953,378

4

2

null

2011-05-10 16:29:26.047 UTC

null

2011-05-10 16:37:46.887 UTC

2011-05-10 16:34:31.32 UTC

null

311,941

null

2,089,192

null

1

4

css

42,268

<pre><code>#footer ul li { display: block; float: left; height: 27px; list-style: none; margin-right: 20px; } </code></pre>

6,295,161

How to build a DataTable from a DataGridView?

I may well be looking at this problem backwards but I am curious none the less. Is there a way to build a <code>DataTable</code> from what is currently displayed in the <code>DataGridView</code>? To be clear, I know you can do this <code>DataTable data = (DataTable)(dgvMyMembers.DataSource);</code> however that includes hidden columns. I would like to build it from the displayed columns only. Hope that makes sense. <hr> So I ended up trying a combination of a couple of answers as that seemed best. Below is what I am trying. Basically I am creating the DataTable from the DataSource and then working backwards based on if a column is visible or not. However, after it removes a column I get a <code>Collection was modified; enumeration operation may not execute</code> on the next iteration of the <code>foreach</code>. I am confused as I am not trying to modify the <code>DataGridView</code>, only the <code>DataTable</code> so what's up? <pre><code>DataTable data = GetDataTableFromDGV(dgvMyMembers); private DataTable GetDataTableFromDGV(DataGridView dgv) { var dt = ((DataTable)dgv.DataSource).Copy(); foreach (DataGridViewColumn column in dgv.Columns) { if (!column.Visible) { dt.Columns.Remove(column.Name); } } return dt; } </code></pre>

6,295,819

4

1

null

2011-06-09 15:16:56.21 UTC

3

2018-03-18 08:08:38.263 UTC

2011-06-10 15:27:50.507 UTC

null

46,724

null

46,724

null

1

16

c#|.net|datagridview|datatable

111,206

Well, you can do <pre><code>DataTable data = (DataTable)(dgvMyMembers.DataSource); </code></pre> and then use <pre><code>data.Columns.Remove(...); </code></pre> I think it's the fastest way. This will modify data source table, if you don't want it, then copy of table is reqired. Also be aware that <code>DataGridView.DataSource</code> is not necessarily of <code>DataTable</code> type.

5,714,117

Errors using rspec, missing libraries after installing Homebrew and uninstalling MacPorts

I may have taken one step too far beyond my knowledge. I installed <a href="https://en.wikipedia.org/wiki/Homebrew_%28package_management_software%29" rel="nofollow">Homebrew</a> and after it continued to give me warnings about having <a href="http://en.wikipedia.org/wiki/MacPorts" rel="nofollow">MacPorts</a> installed I uninstalled that. But now my rspec tests don't run. These are the errors I get: <pre><code>/Users/mark/.rvm/gems/ruby-1.9.2-p180/gems/nokogiri-1.4.4/lib/nokogiri.rb:13:in `require': dlopen(/Users/mark/.rvm/gems/ruby-1.9.2-p180/gems/nokogiri-1.4.4/lib/nokogiri/nokogiri.bundle, 9): Library not loaded: /opt/local/lib/libiconv.2.dylib (LoadError) Referenced from: /Users/mark/.rvm/gems/ruby-1.9.2-p180/gems/nokogiri-1.4.4/lib/nokogiri/nokogiri.bundle Reason: Incompatible library version: nokogiri.bundle requires version 8.0.0 or later, but libiconv.2.dylib provides version 7.0.0 - /Users/mark/.rvm/gems/ruby-1.9.2-p180/gems/nokogiri-1.4.4/lib/nokogiri/nokogiri.bundle ..... ..... </code></pre> I've installed libiconv through Homebrew, but that didn't fix it. It's complaining about libiconv version numbers. Is this the problem? What is going on here and what do I need to do?

5,783,919

4

1

null

2011-04-19 09:14:17.613 UTC

3

2016-02-18 20:38:47.107 UTC

2016-02-18 20:36:27.423 UTC

null

63,550

null

334,304

null

1

35

nokogiri|rsync|macports|homebrew|libiconv

5,969

I got things working again for anyone interested. I removed and re-installed nokogiri gem and everything seems to be working again.

6,272,702

should Modernizr file be placed in head?

Should the reference to the Modernizr JavaScript file be in the head of the page? I always try and place all scripts on the bottom of the page and would like to preserve this. And if it needs to be in the head, why?

6,272,728

4

0

null

2011-06-07 23:24:38.193 UTC

15

2015-04-22 20:20:21.27 UTC

null

55,965

null

373,674

null

1

63

javascript|modernizr|html-head

32,360

If you want <a href="http://www.modernizr.com/" rel="noreferrer">Modernizr</a> to download and execute as soon as possible to prevent a <a href="http://en.wikipedia.org/wiki/Flash_of_unstyled_content" rel="noreferrer">FOUC</a>, put it in the <code><head></code> From their <a href="http://www.modernizr.com/docs/#installing" rel="noreferrer">installation guide</a>: <blockquote> Drop the script tags in the <code><head></code> of your HTML. For best performance, you should have them follow after your stylesheet references. The reason we recommend placing Modernizr in the head is two-fold: the HTML5 Shiv (that enables HTML5 elements in IE) must execute before the <code><body></code>, and if you’re using any of the CSS classes that Modernizr adds, you’ll want to prevent a FOUC. </blockquote>

1,940,528

Django index page best/most common practice

I am working on a site currently (first one solo) and went to go make an index page. I have been attempting to follow django best practices as I go, so naturally I go search for this but couldn't a real standard in regards to this. I have seen folks creating apps to serve this purpose named various things (main, home, misc) and have seen a views.py in the root of the project. I am really just looking for what the majority out there do for this. The index page is not static, since I want to detect if the user is logged in and such. Thanks.

1,940,720

2

0

null

2009-12-21 14:51:08.237 UTC

10

2009-12-21 15:33:37.277 UTC

null

230,614

null

1

21

python|django|indexing

12,381

If all of your dynamic content is handled in the template (for example, if it's just simple checking if a user is present on the request), then I recommend using a generic view, specificially the <a href="http://docs.djangoproject.com/en/1.1/ref/generic-views/#django-views-generic-simple-direct-to-template" rel="noreferrer">direct to template</a> view: <pre><code>urlpatterns = patterns('django.views.generic.simple', (r'^$', 'direct_to_template', {'template': 'index.html'}), ) </code></pre> If you want to add a few more bits of information to the template context, there is another argument, <code>extra_context</code>, that you can pass to the generic view to include it: <pre><code>extra_context = { 'foo': 'bar', # etc } urlpatterns = patterns('django.views.generic.simple', (r'^$', 'direct_to_template', {'template': 'index.html', 'extra_context': extra_context }), ) </code></pre>

19,615,760

Groupby with User Defined Functions Pandas

I understand that passing a function as a group key calls the function once per index value with the return values being used as the group names. What I can't figure out is how to call the function on column values. So I can do this: <pre><code>people = pd.DataFrame(np.random.randn(5, 5), columns=['a', 'b', 'c', 'd', 'e'], index=['Joe', 'Steve', 'Wes', 'Jim', 'Travis']) def GroupFunc(x): if len(x) > 3: return 'Group1' else: return 'Group2' people.groupby(GroupFunc).sum() </code></pre> This splits the data into two groups, one of which has index values of length 3 or less, and the other with length three or more. But how can I pass one of the column values? So for example if column d value for each index point is greater than 1. I realise I could just do the following: <pre><code>people.groupby(people.a > 1).sum() </code></pre> But I want to know how to do this in a user defined function for future reference. Something like: <pre><code>def GroupColFunc(x): if x > 1: return 'Group1' else: return 'Group2' </code></pre> But how do I call this? I tried <pre><code>people.groupby(GroupColFunc(people.a)) </code></pre> and similar variants but this does not work. How do I pass the column values to the function? How would I pass multiple column values e.g. to group on whether people.a > people.b for example?

19,616,072

1

0

null

2013-10-27 07:41:51.357 UTC

13

2018-12-11 06:32:11.963 UTC

null

2,745,140

null

2,484,720

null

1

35

python|pandas

25,905

To group by a > 1, you can define your function like: <pre><code>>>> def GroupColFunc(df, ind, col): ... if df[col].loc[ind] > 1: ... return 'Group1' ... else: ... return 'Group2' ... </code></pre> An then call it like <pre><code>>>> people.groupby(lambda x: GroupColFunc(people, x, 'a')).sum() a b c d e Group2 -2.384614 -0.762208 3.359299 -1.574938 -2.65963 </code></pre> Or you can do it only with anonymous function: <pre><code>>>> people.groupby(lambda x: 'Group1' if people['b'].loc[x] > people['a'].loc[x] else 'Group2').sum() a b c d e Group1 -3.280319 -0.007196 1.525356 0.324154 -1.002439 Group2 0.895705 -0.755012 1.833943 -1.899092 -1.657191 </code></pre> As said in <a href="http://pandas.pydata.org/pandas-docs/dev/groupby.html" rel="noreferrer">documentation</a>, you can also group by passing Series providing a label -> group name mapping: <pre><code>>>> mapping = np.where(people['b'] > people['a'], 'Group1', 'Group2') >>> mapping Joe Group2 Steve Group1 Wes Group2 Jim Group1 Travis Group1 dtype: string48 >>> people.groupby(mapping).sum() a b c d e Group1 -3.280319 -0.007196 1.525356 0.324154 -1.002439 Group2 0.895705 -0.755012 1.833943 -1.899092 -1.657191 </code></pre>

2,465,675

Custom keys for Google App Engine models (Python)

First off, I'm relatively new to Google App Engine, so I'm probably doing something silly. Say I've got a model Foo: <pre><code>class Foo(db.Model): name = db.StringProperty() </code></pre> I want to use <code>name</code> as a unique key for every <code>Foo</code> object. How is this done? When I want to get a specific <code>Foo</code> object, I currently query the datastore for all <code>Foo</code> objects with the target unique name, but queries are slow (plus it's a pain to ensure that <code>name</code> is unique when each new <code>Foo</code> is created). There's got to be a better way to do this! Thanks.

2,466,007

2

0

null

2010-03-17 20:34:22.01 UTC

11

2010-12-25 15:30:05.41 UTC

null

21,475

null

21,475

null

1

12

python|google-app-engine|google-cloud-datastore|primary-key

4,308

I've used the code below in a project before. It will work as long as the field on which you're basing your key name on is required. <pre><code>class NamedModel(db.Model): """A Model subclass for entities which automatically generate their own key names on creation. See documentation for _generate_key function for requirements.""" def __init__(self, *args, **kwargs): kwargs['key_name'] = _generate_key(self, kwargs) super(NamedModel, self).__init__(*args, **kwargs) def _generate_key(entity, kwargs): """Generates a key name for the given entity, which was constructed with the given keyword args. The entity must have a KEY_NAME property, which can either be a string or a callable. If KEY_NAME is a string, the keyword args are interpolated into it. If it's a callable, it is called, with the keyword args passed to it as a single dict.""" # Make sure the class has its KEY_NAME property set if not hasattr(entity, 'KEY_NAME'): raise RuntimeError, '%s entity missing KEY_NAME property' % ( entity.entity_type()) # Make a copy of the kwargs dict, so any modifications down the line don't # hurt anything kwargs = dict(kwargs) # The KEY_NAME must either be a callable or a string. If it's a callable, # we call it with the given keyword args. if callable(entity.KEY_NAME): return entity.KEY_NAME(kwargs) # If it's a string, we just interpolate the keyword args into the string, # ensuring that this results in a different string. elif isinstance(entity.KEY_NAME, basestring): # Try to create the key name, catching any key errors arising from the # string interpolation try: key_name = entity.KEY_NAME % kwargs except KeyError: raise RuntimeError, 'Missing keys required by %s entity\'s KEY_NAME '\ 'property (got %r)' % (entity.entity_type(), kwargs) # Make sure the generated key name is actually different from the # template if key_name == entity.KEY_NAME: raise RuntimeError, 'Key name generated for %s entity is same as '\ 'KEY_NAME template' % entity.entity_type() return key_name # Otherwise, the KEY_NAME is invalid else: raise TypeError, 'KEY_NAME of %s must be a string or callable' % ( entity.entity_type()) </code></pre> You could then modify your example model like so: <pre><code>class Foo(NamedModel): KEY_NAME = '%(name)s' name = db.StringProperty() </code></pre> Of course, this could be dramatically simplified in your case, changing the first line of the <code>NamedModel</code>'s <code>__init__</code> method to something like: <pre><code>kwargs['key_name'] = kwargs['name'] </code></pre>

41,194,726

python generator thread safety using Keras

I am using Keras for some ML and have this generator for the data and labels: <pre><code>def createBatchGenerator(driving_log,batch_size=32): batch_images = np.zeros((batch_size, 66, 200, 3)) batch_steering = np.zeros(batch_size) while 1: for i in range(batch_size): x,y = get_preprocessed_row(driving_log) batch_images[i]=x batch_steering[i]=y yield batch_images, batch_steering </code></pre> When I use it locally it runs fine, but when I run it on an AWS g2.2xlarge with a GPU, I get this error "ValueError: generator already executing". Can someone please help me resolve this?

41,645,042

1

0

null

2016-12-17 02:07:40.267 UTC

8

2018-01-01 23:01:04.223 UTC

null

1,628,347

null

1

17

python|generator

10,326

You need to make a <a href="http://anandology.com/blog/using-iterators-and-generators/" rel="noreferrer">generator that can support multi-threading</a> to make sure the generator is called by two threads at once: <pre><code>import threading class createBatchGenerator: def __init__(self, driving_log,batch_size=32): self.driving_log = driving_log self.batch_size = batch_size self.lock = threading.Lock() def __iter__(self): return self def __next__(self): with self.lock: batch_images = np.zeros((batch_size, 66, 200, 3)) batch_steering = np.zeros(batch_size) for i in range(self.batch_size): x,y = get_preprocessed_row(self.driving_log) batch_images[i]=x batch_steering[i]=y return batch_images, batch_steering </code></pre>

52,737,078

How can you use axios interceptors?

I have seen axios documentation, but all it says is <pre><code>// Add a request interceptor axios.interceptors.request.use(function (config) { // Do something before request is sent return config; }, function (error) { // Do something with request error return Promise.reject(error); }); // Add a response interceptor axios.interceptors.response.use(function (response) { // Do something with response data return response; }, function (error) { // Do something with response error return Promise.reject(error); }); </code></pre> Also many tutorials only show this code but I am confused what it is used for, can someone please give me simple example to follow.

52,737,325

7

0

null

2018-10-10 09:35:57.5 UTC

55

2022-09-20 14:23:39.417 UTC

2018-10-10 10:21:42.693 UTC

null

3,076,424

null

7,563,926

null

1

142

javascript|axios

197,947

To talk in simple terms, it is more of a checkpoint for every HTTP action. Every API call that has been made, is passed through this interceptor. So, why two interceptors? An API call is made up of two halves, a request, and a response. Since it behaves like a checkpoint, the request and the response have separate interceptors. Some request interceptor use cases - Assume you want to check before making a request if your credentials are valid. So, instead of actually making an API call, you can check at the interceptor level that your credentials are valid. Assume you need to attach a token to every request made, instead of duplicating the token addition logic at every Axios call, you can make an interceptor that attaches a token on every request that is made. Some response interceptor use cases - Assume you got a response, and judging by the API responses you want to deduce that the user is logged in. So, in the response interceptor, you can initialize a class that handles the user logged in state and update it accordingly on the response object you received. Assume you have requested some API with valid API credentials, but you do not have the valid role to access the data. So, you can trigger an alert from the response interceptor saying that the user is not allowed. This way you'll be saved from the unauthorized API error handling that you would have to perform on every Axios request that you made. Here are some code examples The request interceptor <ul> <li>One can print the configuration object of axios (if need be) by doing (in this case, by checking the environment variable): <pre class="lang-js prettyprint-override"><code>const DEBUG = process.env.NODE_ENV === "development"; axios.interceptors.request.use((config) => { /** In dev, intercepts request and logs it into console for dev */ if (DEBUG) { console.info("✉️ ", config); } return config; }, (error) => { if (DEBUG) { console.error("✉️ ", error); } return Promise.reject(error); }); </code></pre> </li> <li>If one wants to check what headers are being passed/add any more generic headers, it is available in the <code>config.headers</code> object. For example: <pre class="lang-js prettyprint-override"><code>axios.interceptors.request.use((config) => { config.headers.genericKey = "someGenericValue"; return config; }, (error) => { return Promise.reject(error); }); </code></pre> </li> <li>In case it's a <code>GET</code> request, the query parameters being sent can be found in <code>config.params</code> object. </li> </ul> The response interceptor <ul> <li>You can even optionally parse the API response at the interceptor level and pass the parsed response down instead of the original response. It might save you the time of writing the parsing logic again and again in case the API is used in the same way in multiple places. One way to do that is by passing an extra parameter in the <code>api-request</code> and use the same parameter in the response interceptor to perform your action. For example: <pre class="lang-js prettyprint-override"><code>//Assume we pass an extra parameter "parse: true" axios.get("/city-list", { parse: true }); </code></pre> Once, in the response interceptor, we can use it like: <pre class="lang-js prettyprint-override"><code>axios.interceptors.response.use((response) => { if (response.config.parse) { //perform the manipulation here and change the response object } return response; }, (error) => { return Promise.reject(error.message); }); </code></pre> So, in this case, whenever there is a <code>parse</code> object in <code>response.config</code>, the manipulation is done, for the rest of the cases, it'll work as-is. </li> <li>You can even view the arriving <code>HTTP</code> codes and then make the decision. For example: <pre class="lang-js prettyprint-override"><code>axios.interceptors.response.use((response) => { if(response.status === 401) { alert("You are not authorized"); } return response; }, (error) => { if (error.response && error.response.data) { return Promise.reject(error.response.data); } return Promise.reject(error.message); }); </code></pre> </li> </ul>

39,597,925

How do I set environment variables during the build in docker

I'm trying to set environment variables in docker container during the build but without success. Setting them when using run command works but I need to set them during the build. Dockerfile <pre><code>FROM ubuntu:latest ARG TEST_ENV=something </code></pre> Command I'm using to build <pre><code>docker build -t --build-arg TEST_ENV="test" myimage . </code></pre> Running <pre><code>docker run -dit myimage </code></pre> I'm checking available environment variables by using <pre><code>docker exec containerid printenv </code></pre> and the result is <pre><code>PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin HOSTNAME=e49c1abfd58b TERM=xterm no_proxy=*.local, 169.254/16 HOME=/root </code></pre> TEST_ENV is not present

39,598,751

2

0

null

2016-09-20 15:20:39.973 UTC

37

2021-03-30 07:24:53.907 UTC

null

6,599,814

null

1

184

docker|dockerfile

236,584

<code>ARG</code> is for setting environment variables which are used during the <code>docker build</code> process - they are not present in the final image, which is why you don't see them when you use <code>docker run</code>. You use <code>ARG</code> for settings that are only relevant when the image is being built, and aren't needed by containers which you run from the image. You can use <code>ENV</code> for environment variables to use during the build and in containers. With this Dockerfile: <pre><code>FROM ubuntu ARG BUILD_TIME=abc ENV RUN_TIME=123 RUN touch /env.txt RUN printenv > /env.txt </code></pre> You can override the build arg as you have done with <code>docker build -t temp --build-arg BUILD_TIME=def .</code>. Then you get what you expect: <pre><code>> docker run temp cat /env.txt HOSTNAME=b18b9cafe0e0 RUN_TIME=123 HOME=/root PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin BUILD_TIME=def PWD=/ </code></pre>

33,176,336

Need an example about RecyclerView.Adapter.notifyItemChanged(int position, Object payload)

According to <code>RecyclerView</code> documentation about medthod <a href="https://developer.android.com/reference/android/support/v7/widget/RecyclerView.Adapter.html#notifyItemChanged(int,%20java.lang.Object)" rel="noreferrer">notifyItemChanged(int position, Object payload)</a> <blockquote> Notify any registered observers that the item at position has changed with an optional payload object. </blockquote> I don't understand how to use second paramenter <code>payload</code> in this method. I have searched many document about "payload" but everything was ambiguous. So, If you know about this method, please show me a clear example about it. Thank you very much.

33,968,779

4

0

null

2015-10-16 17:34:19.73 UTC

17

2019-04-12 09:42:32.88 UTC

2018-07-31 06:48:32.08 UTC

null

1,551,475

null

5,192,252

null

1

73

android|android-recyclerview|payload

58,175

Check out this sample code that demonstrates the feature. It's a <code>RecyclerView</code> that calls <code>notifyItemChanged(position, payload)</code> when the item at position <code>position</code> is clicked. You can verify that <code>onBindViewHolder(holder, position, payload)</code> was called by looking for the logcat statement. Make sure you are using at least version <code>23.1.1</code> of the support libraries, like so: <pre><code>dependencies { compile fileTree(dir: 'libs', include: ['*.jar']) compile 'com.android.support:appcompat-v7:23.1.1' compile 'com.android.support:recyclerview-v7:23.1.1' compile 'com.android.support:cardview-v7:23.1.1' } </code></pre> HelloActivity.java <pre><code>package com.formagrid.hellotest; import android.app.Activity; import android.os.Bundle; import android.support.v7.widget.CardView; import android.support.v7.widget.DefaultItemAnimator; import android.support.v7.widget.LinearLayoutManager; import android.support.v7.widget.RecyclerView; import android.util.Log; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.TextView; import java.util.List; public class HelloActivity extends Activity { private RecyclerView mRecyclerView; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mRecyclerView = (RecyclerView) findViewById(R.id.recycler_view); mRecyclerView.setLayoutManager(new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false)); mRecyclerView.setAdapter(new HelloAdapter()); DefaultItemAnimator animator = new DefaultItemAnimator() { @Override public boolean canReuseUpdatedViewHolder(RecyclerView.ViewHolder viewHolder) { return true; } }; mRecyclerView.setItemAnimator(animator); } private static class HelloAdapter extends RecyclerView.Adapter<HelloAdapter.HelloViewHolder> { public class HelloViewHolder extends RecyclerView.ViewHolder { public TextView textView; public HelloViewHolder(CardView cardView) { super(cardView); textView = (TextView) cardView.findViewById(R.id.text_view); } } @Override public HelloViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { CardView cardView = (CardView) LayoutInflater.from(parent.getContext()).inflate( R.layout.card_item, parent, false); return new HelloViewHolder(cardView); } @Override public void onBindViewHolder(HelloViewHolder holder, int position) { bind(holder); } @Override public void onBindViewHolder(HelloViewHolder holder, int position, List<Object> payload) { Log.d("butt", "payload " + payload.toString()); bind(holder); } @Override public int getItemCount() { return 20; } private void bind(final HelloViewHolder holder) { holder.textView.setText("item " + holder.getAdapterPosition()); holder.itemView.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { final int position = holder.getAdapterPosition(); Log.d("butt", "click " + position); HelloAdapter.this.notifyItemChanged(position, "payload " + position); } }); } } } </code></pre> activity_main.xml <pre><code><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context=".HelloActivity"> <android.support.v7.widget.RecyclerView android:id="@+id/recycler_view" android:layout_width="match_parent" android:layout_height="match_parent"/> </RelativeLayout> </code></pre> card_item.xml <pre><code><?xml version="1.0" encoding="utf-8"?> <android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android" xmlns:card_view="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent" android:layout_height="100dip" android:layout_margin="5dip" card_view:cardElevation="5dip"> <TextView android:id="@+id/text_view" android:layout_width="match_parent" android:layout_height="match_parent"/> </android.support.v7.widget.CardView> </code></pre>

38,390,177

What is a NoReverseMatch error, and how do I fix it?

I have some code and when it executes, it throws a NoReverseMatch, saying: <blockquote> NoReverseMatch at /my_url/ Reverse for 'my_url_name' with arguments '()' and keyword arguments '{}' not found. n pattern(s) tried: [] </blockquote> What does this mean, and what can I do about it?

38,390,178

5

0

null

2016-07-15 07:22:59.38 UTC

68

2022-03-11 11:16:27.43 UTC

null

1,324,033

null

1

154

django|django-urls

190,040

The <a href="https://docs.djangoproject.com/en/dev/ref/exceptions/#noreversematch" rel="noreferrer"><code>NoReverseMatch</code></a> error is saying that Django cannot find a matching url pattern for the url you've provided in any of your installed app's urls. <blockquote> The NoReverseMatch exception is raised by django.core.urlresolvers when a matching URL in your URLconf cannot be identified based on the parameters supplied. </blockquote> To start debugging it, you need to start by disecting the error message given to you. <ul> <li>NoReverseMatch at /my_url/ This is the url that is currently being rendered, it is this url that your application is currently trying to access but it contains a url that cannot be matched </li> <li>Reverse for 'my_url_name' This is the name of the url that it cannot find </li> <li>with arguments '()' and These are the non-keyword arguments its providing to the url </li> <li>keyword arguments '{}' not found. These are the keyword arguments its providing to the url </li> <li>n pattern(s) tried: [] These are the patterns that it was able to find in your urls.py files that it tried to match against </li> </ul> Start by locating the code in your source relevant to the url that is currently being rendered - the url, the view, and any templates involved. In most cases, this will be the part of the code you're currently developing. Once you've done this, read through the code in the order that django would be following until you reach the line of code that is trying to construct a url for your <code>my_url_name</code>. Again, this is probably in a place you've recently changed. Now that you've discovered where the error is occuring, use the other parts of the error message to work out the issue. <h2>The url name</h2> <ul> <li>Are there any typos?</li> <li>Have you provided the url you're trying to access the given name?</li> <li>If you have set app_name in the app's <code>urls.py</code> (e.g. <code>app_name = 'my_app'</code>) or if you included the app with a namespace (e.g. <code>include('myapp.urls', namespace='myapp')</code>, then you need to include the namespace when reversing, e.g. <code>{% url 'myapp:my_url_name' %}</code> or <code>reverse('myapp:my_url_name')</code>.</li> </ul> <h2>Arguments and Keyword Arguments</h2> The arguments and keyword arguments are used to match against any capture groups that are present within the given url which can be identified by the surrounding <code>()</code> brackets in the url pattern. Assuming the url you're matching requires additional arguments, take a look in the error message and first take a look if the value for the given arguments look to be correct. If they aren't correct: <ul> <li>The value is missing or an empty string This generally means that the value you're passing in doesn't contain the value you expect it to be. Take a look where you assign the value for it, set breakpoints, and you'll need to figure out why this value doesn't get passed through correctly. </li> <li>The keyword argument has a typo Correct this either in the url pattern, or in the url you're constructing. </li> </ul> If they are correct: <ul> <li>Debug the regex You can use a website such as <a href="http://regexr.com/" rel="noreferrer">regexr</a> to quickly test whether your pattern matches the url you think you're creating, Copy the url pattern into the regex field at the top, and then use the text area to include any urls that you think it should match against. Common Mistakes: <ul> <li>Matching against the <code>.</code> wild card character or any other regex characters Remember to escape the specific characters with a <code>\</code> prefix </li> <li>Only matching against lower/upper case characters Try using either <code>a-Z</code> or <code>\w</code> instead of <code>a-z</code> or <code>A-Z</code> </li> </ul> </li> <li>Check that pattern you're matching is included within the patterns tried If it isn't here then its possible that you have forgotten to include your app within the <code>INSTALLED_APPS</code> setting (or the ordering of the apps within <code>INSTALLED_APPS</code> may need looking at) </li> </ul> <h2>Django Version</h2> In Django 1.10, the ability to reverse a url by its python path was removed. The named path should be used instead. <hr /> If you're still unable to track down the problem, then feel free to ask a new question that includes what you've tried, what you've researched (You can link to this question), and then include the relevant code to the issue - the url that you're matching, any relevant url patterns, the part of the error message that shows what django tried to match, and possibly the <code>INSTALLED_APPS</code> setting if applicable.

41,665,902

how do I style an Alert element in react-native?

I'm working with react-native and I have created an Alert element. <pre><code>Alert.alert( 'Warning', 'bla bla bla', [ {text: 'OK', onPress: () => console.log('OK Pressed')}, ] ) </code></pre> Now I'd like to apply some style to it. Let's say I want to apply to it a red background color and white color for the text. How can I achieve this? Is it possible?

41,674,279

4

0

null

2017-01-15 20:25:34.233 UTC

1

2020-01-13 22:28:16.71 UTC

null

4,188,968

null

1

27

reactjs|react-native

88,325

You can use a custom library like <a href="https://github.com/maxs15/react-native-modalbox" rel="noreferrer">react-native-modalbox</a>. You'll be able to style the modal as you like: <pre><code> <Modal style={{background: 'red'}} ref={"modal1"}> <Text style={{color: 'white'}}>Basic modal</Text> <Button onPress={this.toggleSwipeToClose} style={styles.btn}>Disable swipeToClose({this.state.swipeToClose ? "true" : "false"})</Button> </Modal> </code></pre> You can open the modal using <pre><code>openModal1(id) { this.refs.modal1.open(); } </code></pre> Check out <a href="https://github.com/maxs15/react-native-modalbox/blob/master/Example/index.ios.js" rel="noreferrer">the example</a> to see more options. Bonus: If you want to find a good library for react-native, try <a href="https://js.coach/react-native" rel="noreferrer">js.coach</a>

41,446,362

Hide columns in bootstrap table at startup

I have the following table, where I use <code>Bootstrap-table</code> <pre><code><div class="row mystyle" > <div class="col-md-12"> <table id="mytable" data-row-style="rowStyle" class="table table-hover" id="table-pagination " data-url="labels.json" data-toggle="table" data-pagination="true" data-show-pagination-switch="true" data-sort-order="desc" data-search="true" data-show-refresh="true" data-show-columns="true" data-page-list="[10, 25, 50, 100, ALL]" > <thead> <tr> <th data-field="customer.name" data-align="center" data-sortable="true">customer</th> <th data-field="type" data-align="center" data-sortable="true">type</th> <th data-field="description" data-align="center" data-sortable="true">description</th> <th data-field="cutter" data-align="center" data-sortable="true">cutter</th> <th data-field="valid_s" data-align="center" data-sortable="true">valid</th> </tr> </thead> </table> </div> </div> </code></pre> Is there a way to define which columns will be hidden at startup? For example, I want to show only <code>customer</code> and <code>description</code> column.

41,539,875

7

0

null

2017-01-03 15:01:30.137 UTC

3

2021-04-29 22:40:13.07 UTC

2017-06-12 16:20:48.863 UTC

null

4,281,779

null

2,594,961

null

1

20

twitter-bootstrap|bootstrap-table

55,347

You can use <code>data-visible="false"</code>: <pre><code><thead> <tr> <th data-field="customer.name" data-align="center" data-sortable="true">customer</th> <th data-field="type" data-align="center" data-sortable="true" data-visible="false">type</th> <th data-field="description" data-align="center" data-sortable="true">description</th> <th data-field="cutter" data-align="center" data-sortable="true" data-visible="false">cutter</th> <th data-field="valid_s" data-align="center" data-sortable="true" data-visible="false">valid</th> </tr> </thead> </code></pre>

41,301,627

How to update git commit author, but keep original date when amending?

If the commits are already made and pushed to the repository, and if want to change an author for some particular commit I can do it like this: <pre><code>git commit --amend --reset-author </code></pre> But, that will change the original committed date. How can I reset author, but keep the original committer date?

41,303,384

6

0

null

2016-12-23 12:33:35.733 UTC

15

2022-08-11 01:23:57.78 UTC

null

1,612,469

null

1

19

git

9,571

Hm, at the end, I have found a bit easier solution for me. I have created a script in directory containing the git project <code>gitrewrite.sh</code>, and modified its permissions so it could be exectured: <pre><code>$ chmod 700 gitrewrite.sh </code></pre> Then I placed in the shell script: <pre><code>#!/bin/sh git filter-branch --env-filter ' NEW_NAME="MyName" NEW_EMAIL="[email protected]" if [ "$GIT_COMMIT" = "afdkjh1231jkh123hk1j23" ] || [ "$GIT_COMMIT" = "43hkjwldfpkmsdposdfpsdifn" ] then export GIT_COMMITTER_NAME="$NEW_NAME" export GIT_COMMITTER_EMAIL="$NEW_EMAIL" export GIT_AUTHOR_NAME="$NEW_NAME" export GIT_AUTHOR_EMAIL="$NEW_EMAIL" fi ' --tag-name-filter cat -- --branches --tags </code></pre> And then run the script in terminal: <pre><code>$ ./gitrewrite.sh </code></pre> And that's it. The history has been rewritten. Push the code to the repository and add a <code>force</code> flag. <code>$ git push -f</code> Important note: For the others reading it, keep in mind that this is going to create new references in the git history so do this only in private repository or the one which is still not shared with others as it could cause broken references! Mine was a private repo, so no worries there for that part. If it is public, then perhaps using the other suggested answer could be a better option.

1,667,720

HTTP, 408 Request timeout

I have an application, written in C++. This app dispatches a certain info to a script located on a remote website using HTTP POST requests. The app sends requests with a period from several seconds to several minutes. The problem is that after about a half an hour of working without errors, the app starts to get a 408 Request timeout error from the web server. Then the app starts to retry posting but the server keeps on responding with 408 Request timeout. An interesting observation: the error disappears after I access the website using a browser and the app works OK for about 30 minutes after that, then the issue comes back. What could be the reason and is there any workaround to this? PS: the app works on a usual PC with XP Workstation. The website is on GoDaddy web server. thanks in advance

12,069,718

1

3

null

2009-11-03 14:38:06.843 UTC

4

2015-03-29 17:36:20.897 UTC

null

201,751

null

201,751

null

1

21

http|http-status-code-408

47,449

I know this is an old post but thought this might help someone since this problem cause me hours of frustration. I was experiencing the same issue with a GoDaddy webserver. My Android app sent POST requests to the server and would work as expected but I started experiencing 408 Request timeout errors after 30 mins or so. I also noticed that the problem went away if I opened up a browser and opened my home page (PHP Wordpress site) from a PC or the Android device. The website was in test so web traffic was minimal and I was able to confirm this behaviour in the server logs fairly easily. I logged a support call to GoDaddy but whilst their staff were responsive and helpful, they did not provide any useful information to explain the behaviour. I was however able to work around the issue by simply executing a dummy GET request before my POST request and this 'woke up' the web server and it responded to all subsequent POST requests.

21,695,520

-tsa or -tsacert timestamp for applet jar self-signed

When I was trying to self-sign in the jar like below. <pre><code>jarsigner -keystore my keystore myjar.jar myalias </code></pre> It gives warning like: <blockquote> No -tsa or -tsacert is provided and this jar is not timestamped. Without a timestamp, users may not be able to validate this jar after the signer certificate's expiration date (2014-05-08) or after any future revocation date. </blockquote> Please help to resolve the problem.

24,178,906

4

0

null

2014-02-11 07:18:35.727 UTC

10

2018-07-19 21:44:48.513 UTC

2014-07-25 14:15:30.05 UTC

null

334,493

null

998,676

null

1

50

java|jar|applet|signed-applet

37,717

The recent Java 7 provides a (courtesy?) warning about something which has been in place for a decade... Trusted Timestamping was introducing in Java 5 (2004). The motivation was so that developers would not be forced "to re-sign deployed JAR files annually" when the certificates expired. → <a href="http://docs.oracle.com/javase/1.5.0/docs/guide/security/time-of-signing.html" rel="noreferrer">http://docs.oracle.com/javase/1.5.0/docs/guide/security/time-of-signing.html</a> A URL-based Time Stamp Authority (TSA) is usually provided by the issuing Certificate Authority (CA) to work with the same certificates the CA issued. For example, the digicert tsa url can be access as follows: <code>jarsigner -tsa http://timestamp.digicert.com [.. other options]</code> → <a href="http://www.digicert.com/code-signing/java-code-signing-guide.htm" rel="noreferrer">http://www.digicert.com/code-signing/java-code-signing-guide.htm</a> Time stamping with self-signed certificate may be an elusive goal since (1) a TSA timestamp needs to be an trusted arms-length transaction (which rules out "self timestamping"), and (2) typical TSA URLs are setup to work with the certificates provided by the same CA organization (i.e. the TSA URL does not process a self-signed certificate) Update: URLs to try for timestamping self-signed certificates: <ul> <li>Symantec: <code>-tsa http://sha256timestamp.ws.symantec.com/sha256/timestamp</code> (per comment by brad-turek)</li> </ul> For a private network, one could consider an internal Timestamp Authority such as such as Thales (nCipher) Time Stamp Server (or historically OpenTSA)

39,983,391

Adding Folder to Xcode Project is not Properly added

Team, I created the new Project, on project folder right click open show in finder there I created "ViewControllers" Folder and again right click Add files to "ProjectName" then I added the created folder i.e., "ViewControllers" which is in blue colour "Expected yellow colour folder" that is reference to my project folder the blue colour folder is not. In blue colour folder when i try to added new file its added an empty File. How can i reference my added folder to the Xcode project? how to avoid this blue colour folder class in my project? Your inputs are highly appreciable.

39,984,526

2

0

null

2016-10-11 17:43:46.977 UTC

3

2021-02-28 13:48:37.203 UTC

2016-10-11 17:58:35.523 UTC

null

1,226,963

null

406,457

null

1

20

xcode|reference|directory|project

128,332

If your Xcode project looks like this… <a href="https://i.stack.imgur.com/dUSxU.png" rel="noreferrer"><img src="https://i.stack.imgur.com/dUSxU.png" alt="Xcode project with folder reference"></a> …then you've added your <code>ViewControllers</code> folder as folder reference. To change this folder to a group follow these steps: <ul> <li>Right click on <code>ViewControllers</code></li> <li>Choose <code>Delete</code> in the context menu</li> <li>Choose <code>Remove Reference</code> in the dialog that popped up. The folder will be removed from your Xcode project but not from the file system.</li> <li>Then choose <code>Add Files to <YourProjectName>…</code> in the <code>File</code> menu</li> <li>Find your <code>ViewControllers</code> in the file system</li> <li>Before clicking <code>Add</code> make sure that the option <code>Create groups</code> is selected</li> <li>Click <code>Add</code></li> </ul> You've added your <code>ViewControllers</code> folder as group: <a href="https://i.stack.imgur.com/0prSF.png" rel="noreferrer"><img src="https://i.stack.imgur.com/0prSF.png" alt="Xcode project with folder group"></a> <hr> Important note regarding Xcode 8: The option <code>Create groups</code> might not be visible right away. Apple moved this in Xcode 8 to the bottom of the <code>Add Files to…</code> dialog: <a href="https://i.stack.imgur.com/Rz3pn.png" rel="noreferrer"><img src="https://i.stack.imgur.com/Rz3pn.png" alt="Collapsed options"></a> This reveals the option <code>Create groups</code>: <a href="https://i.stack.imgur.com/LobJt.png" rel="noreferrer"><img src="https://i.stack.imgur.com/LobJt.png" alt="Expanded options"></a>

20,504,348

How to collapse all issues in the Xcode issue navigator

I am porting a huge C++ project to OS X. After my initial compile with Xcode I have multiple errors in many files I want to investigate. Problem is that the issue navigator shows all files non collapsed after each compile: <img src="https://i.stack.imgur.com/6V1g4.png" width="358"> So I have to collapse all of them by hand (there a a lot of files) after each compile to have an overview of a files which need fixing. Is there a hotkey or a setting to collapse all files?

20,504,397

3

0

null

2013-12-10 20:17:35.603 UTC

10

2022-07-06 02:31:12.993 UTC

2013-12-10 20:29:19.4 UTC

null

343,340

null

783,000

null

1

49

xcode|macos

5,930

<kbd>cmd ⌘</kbd>-click one of the little disclosure triangles to collapse (or expand) all rows. <a href="https://i.stack.imgur.com/ay9X8l.png" rel="noreferrer"><img src="https://i.stack.imgur.com/ay9X8l.png" alt="enter image description here"></a>

20,832,769

How to obtain the absolute value of numbers?

I have a list of numbers that looks like the one below: <pre><code>[2, 3, -3, -2] </code></pre> How can I obtain a list of values that contain the absolute value of every value in the above list? In this case it would be: <pre><code>[2, 3, 3, 2] </code></pre>

20,832,775

3

0

null

2013-12-30 03:10:10.163 UTC

2

2021-09-28 14:45:32.78 UTC

null

792,066

null

2,832,224

null

1

16

python

54,635

<ol> <li>You can use <a href="http://docs.python.org/2/library/functions.html#abs"><code>abs</code></a> and <a href="http://docs.python.org/2/library/functions.html#map"><code>map</code></a> functions like this <pre><code>myList = [2,3,-3,-2] print map(abs, myList) </code></pre> Output <pre><code>[2, 3, 3, 2] </code></pre></li> <li>Or you can use list comprehension like this <pre><code>[abs(number) for number in myList] </code></pre></li> <li>Or you can use list comprehension and a simple if else condition like this <pre><code>[-number if number < 0 else number for number in myList] </code></pre></li> </ol>

18,970,265

Is there an easy way to stub out time.Now() globally during test?

Part of our code is time sensitive and we need to able to reserve something and then release it in 30-60 seconds etc, which we can just do a <code>time.Sleep(60 * time.Second)</code> I have just implemented time interface and during test use a stubbed implementation of the time interface, similar to <a href="https://groups.google.com/forum/#!topic/golang-nuts/Mkonfn4j4jo" rel="noreferrer">this golang-nuts discussion</a>. However, <code>time.Now()</code> is called in multiple sites which means we need to pass a variable around to keep track of how much time we have actually slept. I was wondering if there is an alternative way to stub out <code>time.Now()</code> globally. Maybe making a system call to change the system clock? Maybe we can write our own time package which basically wraps around the time package but allows us to change it? Our current implementation works well, I am a go beginner and I am curious to see if anyone has other ideas?

18,970,352

11

0

null

2013-09-23 22:58:43.29 UTC

13

2022-07-01 06:20:30.46 UTC

2019-09-06 16:14:17.97 UTC

null

13,860

null

2,521,225

null

1

75

unit-testing|go

69,136

With implementing a custom interface you are already on the right way. I take it you use the following advise from the golang nuts thread you've posted: <hr> <pre><code>type Clock interface { Now() time.Time After(d time.Duration) <-chan time.Time } </code></pre> <blockquote> and provide a concrete implementation </blockquote> <pre><code>type realClock struct{} func (realClock) Now() time.Time { return time.Now() } func (realClock) After(d time.Duration) <-chan time.Time { return time.After(d) } </code></pre> <blockquote> and a testing implementation. </blockquote> <hr> <a href="https://groups.google.com/d/msg/golang-nuts/Mkonfn4j4jo/0ZhWPUwul7gJ" rel="noreferrer">Original</a> Changing the system time while making tests (or in general) is a bad idea. You don't know what depends on the system time while executing tests and you don't want to find out the hard way by spending days of debugging into that. Just don't do it. There is also no way to shadow the time package globally and doing that would not do anything more you couldn't do with the interface solution. You can write your own time package which uses the standard library and provides a function to switch to a mock time library for testing if it is the time object you need to pass around with the interface solution that is bothering you. The best way to design and test your code would probably be to make as much code stateless as possible. Split your functionality in testable, stateless parts. Testing these components separately is much easier then. Also, less side effects means that it is much easier to make the code run concurrently.

26,607,330

CSS display none and opacity animation with keyframes not working

I have a very basic piece of HTML with the objective of animating from <code>display: none;</code> to <code>display: block</code> with opacity changing from 0 to 1. I'm using Chrome browser, which uses the <code>-webkit</code> prefixes as preference and did a <code>-webkit-keyframes</code> transition set to make the animation possible. However, it does not work and just changes the <code>display</code> without fading. I have a JSFiddle <a href="http://jsfiddle.net/5g4yLcym/" rel="noreferrer">here</a>. <pre><code><html> <head> <style type="text/css"> #myDiv { display: none; opacity: 0; padding: 5px; color: #600; background-color: #CEC; -webkit-transition: 350ms display-none-transition; } #parent:hover>#myDiv { opacity: 1; display: block; } #parent { background-color: #000; color: #FFF; width: 500px; height: 500px; padding: 5px; } @-webkit-keyframes display-none-transition { 0% { display: none; opacity: 0; } 1% { display: block; opacity: 0; } 100% { display: block; opacity: 1; } } </style> <body> <div id="parent"> Hover on me... <div id="myDiv"> Hello! </div> </div> </body> </head> </html> </code></pre>

26,607,526

9

0

null

2014-10-28 11:35:38.72 UTC

10

2021-09-30 06:16:37.087 UTC

2016-10-26 15:54:24.523 UTC

null

5,982,110

null

3,476,093

null

1

23

html|css|animation

86,027

If you are using <code>@keyframes</code> you should use <code>-webkit-animation</code> instead of <code>-webkit-transition</code>. Here is the doc for <code>@keyframes</code> animation: <a href="https://developer.mozilla.org/en-US/docs/Web/Guide/CSS/Using_CSS_animations" rel="noreferrer">https://developer.mozilla.org/en-US/docs/Web/Guide/CSS/Using_CSS_animations</a>. See code snippet below: <div class="snippet" data-lang="js" data-hide="false"> <div class="snippet-code"> <pre class="snippet-code-css lang-css prettyprint-override"><code>.parent { background-color: #000; color: #fff; width: 500px; height: 500px; padding: 5px; } .myDiv { display: none; opacity: 0; padding: 5px; color: #600; background-color: #cec; } .parent:hover .myDiv { display: block; opacity: 1; /* "both" tells the browser to use the above opacity at the end of the animation (best practice) */ -webkit-animation: display-none-transition 1s both; animation: display-none-transition 1s both; } @-webkit-keyframes display-none-transition { 0% { opacity: 0; } } @keyframes display-none-transition { 0% { opacity: 0; } }</code></pre> <pre class="snippet-code-html lang-html prettyprint-override"><code><div class="parent"> Hover on me... <div class="myDiv">Hello!</div> </div></code></pre> </div> </div> <hr> <h2>2016 UPDATED ANSWER</h2> To reflect today's best practices, I would use a transition instead of an animation. Here is the updated code: <div class="snippet" data-lang="js" data-hide="false"> <div class="snippet-code"> <pre class="snippet-code-css lang-css prettyprint-override"><code>.parent { background-color: #000; color: #fff; width: 500px; height: 500px; padding: 5px; } .myDiv { opacity: 0; padding: 5px; color: #600; background-color: #cec; -webkit-transition: opacity 1s; transition: opacity 1s; } .parent:hover .myDiv { opacity: 1; }</code></pre> <pre class="snippet-code-html lang-html prettyprint-override"><code><div class="parent"> Hover on me... <div class="myDiv">Hello!</div> </div></code></pre> </div> </div>

38,611,124

Git commit not possible. There are no staged files

I am using EGits with Eclipse and running into some issues. I have one change from head; I have made one new class. When I right click on this class and click "push", the following dialog shows and I cannot get past it : <a href="https://i.stack.imgur.com/Ar7tg.png" rel="noreferrer"><img src="https://i.stack.imgur.com/Ar7tg.png" alt="Dialog box with "Committing is not posssible. There are no staged files"."></a> Anyway, I need to push this file because I can't commit in real life, and now I cannot commit in Eclipse either and it's taking it's toll mentally. Thanks. PS I have googled this extensively looking for an easy fix (like a "stage" button) and found nothing.

38,611,322

2

4

null

2016-07-27 11:01:37.913 UTC

0

2020-09-22 06:40:18.743 UTC

null

963,156

null

1

24

eclipse|git|commit|egit|eclipse-mars

55,563

using EGit: Right click it and navigate to Team => Add. after then Push the code Before pushing the file add that new file on git using terminal git add after then git push origin branch

34,585,453

How to bind raw html in Angular2

I use Angular 2.0.0-beta.0 and I want to create and bind some simple HTML directly. Is is possible and how? I tried to use <pre><code>{{myField}} </code></pre> but the text in myField will get escaped. For Angular 1.x i found hits for ng-bind-html, but this seems not be supported in 2.x thx Frank

34,585,513

1

0

null

2016-01-04 05:58:57.673 UTC

13

2019-07-29 11:51:39.933 UTC

null

2,436,083

null

1

99

angular

105,679

Bind to the <code>innerHTML</code> attribute There is 2 way to achieve: <pre class="lang-ts prettyprint-override"><code><div [innerHTML]="myField"></div> <div innerHTML="{{myField}}"></div> </code></pre> To mark the passed HTML as trusted so that Angulars DOM sanitizer doesn't strip parts of <pre class="lang-ts prettyprint-override"><code><div [innerHTML]="myField | safeHtml"></div> </code></pre> with a pipe like <pre class="lang-ts prettyprint-override"><code>@Pipe({name: 'safeHtml'}) export class Safe { constructor(private sanitizer:DomSanitizer){} transform(value: any, args?: any): any { return this.sanitizer.bypassSecurityTrustHtml(value); // return this.sanitizer.bypassSecurityTrustStyle(style); // return this.sanitizer.bypassSecurityTrustXxx(style); - see docs } } </code></pre> See also <a href="https://stackoverflow.com/questions/37076867/in-rc-1-some-styles-cant-be-added-using-binding-syntax/37076868#37076868">In RC.1 some styles can't be added using binding syntax</a>

26,274,415

How can I find out, whether a specific package is already installed in Arch Linux

I want to write a bash script allowing me to check, whether a certain package is already installed in arch linux. How can I do that?

26,278,282

5

0

null

2014-10-09 09:03:49.213 UTC

7

2022-01-12 10:01:22.433 UTC

null

2,301,866

null

1

36

linux|bash|archlinux

39,318

You should use Pacman, the package manager of Arch Linux. You want to use the <code>-Q</code> operation to query the installed local package database and the <code>-i</code> option to get information on the package. This gives you <pre><code>pacman -Qi <packageName> </code></pre> You can then use the exit code to determine if the packages existes on the system or not (0 the package exists, 1 it doesn't) The usage of <code>-i</code> rather than <code>-s</code> ensures you will check for exactly that package and not for the presence of a a package containing the package name in its name. For example if I search for <code>chromium</code> (the web browser) on a system where only <code>chromium-bsu</code> (the game) is installed, <pre><code># This exits with 1 because chromium is not installed pacman -Qi chromium # This exits with 0 because chromium-bsu is installed pacman -Qs chromium </code></pre> As <a href="https://stackoverflow.com/a/26274416/829676">Random Citizen</a> pointed out, you certainly want to redirect any output to <code>/dev/null</code> if you are writing a script and don't want Pacman to pollute your output: <pre><code>pacman -Qi <packageName> > /dev/null </code></pre>

22,158,530

Is it possible to train Stanford NER system to recognize more named entities types?

I'm using some NLP libraries now, (stanford and nltk) Stanford I saw the demo part but just want to ask if it possible to use it to identify more entity types. So currently stanford NER system (as the demo shows) can recognize entities as person(name), organization or location. But the organizations recognized are limited to universities or some, big organizations. I'm wondering if I can use its API to write program for more entity types, like if my input is "Apple" or "Square" it can recognize it as a company. Do I have to make my own training dataset? Further more, if I ever want to extract entities and their relationships between each other, I feel I should use the stanford dependency parser. I mean, extract first the named entities and other parts tagged as "noun" and find relations between them. Am I correct. Thanks.

22,170,509

3

0

null

2014-03-03 22:07:18.933 UTC

17

2018-03-23 07:31:55.433 UTC

2014-05-23 15:06:39.223 UTC

null

2,180,785

null

2,209,904

null

1

28

nlp|stanford-nlp|named-entity-recognition

17,941

Yes, you need your own training set. The pre-trained Stanford models only recognise the word "Stanford" as a named entity because they have been trained on data that had that word (or very similar words according to the feature set they use, I don't know what that is) marked as a named entity. Once you have more data, you need to put it in the right format described in <a href="https://stackoverflow.com/questions/15609324/training-n-gram-ner-with-stanford-nlp">this question</a> and the Stanford tutorial.

29,338,066

Run Python Script at OS X Startup

I am very new to python as well as MAC OSX. For my academic project I need to download a bunch of tweets from twitter using twitter streaming API. I need to download atleast 5000000 tweets. So I have written a python script and placed it in start-up. "System Preference -> Users and Groups -> Login items" and added my script there. But I see that the script is not executed when I login to the system ! Please help me resolve this issue.

29,338,130

4

0

null

2015-03-30 03:41:49.323 UTC

12

2022-07-08 09:43:53.38 UTC

2020-08-17 11:09:31.567 UTC

null

4,494

null

1,323,577

null

1

19

macos

23,945

Adapt the following accordingly, name it something like <code>myscript_launcher.plist</code>, and put it in either one of three locations: <code>/System/Library/LaunchAgents</code>, <code>/System/Library/LaunchDaemons</code>, <code>/Users/<username>/Library/LaunchAgents</code>. <pre><code><?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd"> <plist version="1.0"> <dict> <key>Label</key> <string>my.python.script.name</string> <key>ProgramArguments</key> <array> <string>/path/to/python</string> <string>/path/to/python/script.py</string> </array> <key>StandardErrorPath</key> <string>/var/log/python_script.error</string> <key>KeepAlive</key> <true/> </dict> </plist> </code></pre> Also, let's assume you put the plist file in <code>~/Library/LaunchAgents</code>. You can start and stop it with the <code>launchctl</code>. To start, use <code>launchctl load ~/Library/LaunchAgents/myscript_launcher.plist</code>. To stop it, do the same but use the <code>unload</code> argument

32,073,971

Stopping Docker containers by image name - Ubuntu

On Ubuntu 14.04 (Trusty Tahr) I'm looking for a way to stop a running container and the only information I have is the image name that was used in the Docker run command. Is there a command to find all the matching running containers that match that image name and stop them?

32,074,098

20

0

null

2015-08-18 13:35:17.657 UTC

49

2022-05-02 08:22:50.28 UTC

2019-05-02 17:53:11.953 UTC

null

5,449,500

null

20,748

null

1

206

docker|ubuntu|docker-image

191,167

<h2>If you know the <code>image:tag</code> exact container version</h2> Following <a href="https://github.com/docker/docker/issues/8959" rel="noreferrer">issue 8959</a>, a good start would be: <pre><code>docker ps -a -q --filter="name=<containerName>" </code></pre> Since <code>name</code> refers to the container and not the image name, you would need to use the more recent <a href="https://github.com/docker/docker/commit/b1cb1b1df493b3e0b739b9f374b6c82e306dede8" rel="noreferrer">Docker 1.9 filter ancestor</a>, mentioned in <a href="https://stackoverflow.com/users/158288/koekiebox">koekiebox</a>'s <a href="https://stackoverflow.com/a/34899613/6309">answer</a>. <pre><code>docker ps -a -q --filter ancestor=<image-name> </code></pre> <hr /> As commented below by <a href="https://stackoverflow.com/users/1919237/kiril">kiril</a>, to remove those containers: <blockquote> <code>stop</code> returns the containers as well. </blockquote> So chaining <code>stop</code> and <code>rm</code> will do the job: <pre><code>docker rm $(docker stop $(docker ps -a -q --filter ancestor=<image-name> --format="{{.ID}}")) </code></pre> <hr /> <h2>If you know only the image name (not <code>image:tag</code>)</h2> As <a href="https://stackoverflow.com/users/986696/alex-jansen">Alex Jansen</a> points out in <a href="https://stackoverflow.com/questions/32073971/stopping-docker-containers-by-image-name-ubuntu/32074098#comment121207874_32074098">the comments</a>: <blockquote> The <a href="https://docs.docker.com/engine/reference/commandline/ps/#filtering" rel="noreferrer">ancestor option</a> does not support wildcard matching. </blockquote> Alex <a href="https://stackoverflow.com/a/68584752/6309">proposes a solution</a>, but the one I managed to run, when you have multiple containers running from the same image is (in your <code>~/.bashrc</code> for instance): <pre><code>dsi() { docker stop $(docker ps -a | awk -v i="^$1.*" '{if($2~i){print$1}}'); } </code></pre> Then I just call in my bash session (after sourcing <code>~/.bashrc</code>): <pre><code>dsi alpine </code></pre> And any container running from <code>alpine.*:xxx</code> would stop. Meaning: any image whose name is starting with <code>alpine</code>. You might need to tweak the <code>awk -v i="^$1.*"</code> if you want <code>^$1.*</code> to be more precise. From there, of course: <pre><code>drmi() { docker rm $(dsi $1 | tr '\n' ' '); } </code></pre> And a <code>drmi alpine</code> would stop and remove any <code>alpine:xxx</code> container.

36,650,642

did you specify the right host or port? error on Kubernetes

I have followed the helloword tutorial on <a href="http://kubernetes.io/docs/hellonode/" rel="noreferrer">http://kubernetes.io/docs/hellonode/</a>. When I run: <pre><code>kubectl run hello-node --image=gcr.io/PROJECT_ID/hello-node:v1 --port=8080 </code></pre> I get: <blockquote> The connection to the server localhost:8080 was refused - did you specify the right host or port? </blockquote> Why does the command line try to connect to the localhost?

37,188,830

27

0

null

2016-04-15 15:02:11.98 UTC

28

2022-04-20 07:32:25.863 UTC

2020-10-26 05:21:46.293 UTC

null

6,463,558

null

112,976

null

1

129

kubernetes|kubectl

236,485

The issue is that your <code>kubeconfig</code> is not right. To auto-generate it run: <pre><code>gcloud container clusters get-credentials "CLUSTER NAME" </code></pre> This worked for me.

52,754,149

Operation of the mkdir command with dockerfile

I cannot create a directory with the mkdir command in a container with dockerfile. My Dockerfile file is simply ; <pre><code>FROM php:fpm WORKDIR /var/www/html VOLUME ./code:/var/www/html RUN mkdir -p /var/www/html/foo </code></pre> In this way I created a simple php: fpm container. and I wrote to create a directory called foo. <pre><code>docker build -t phpx . </code></pre> I have built with the above code. In my docker-compose file as follows. <pre><code>version: '3' services: web: container_name: phpx build : . ports: - "80:80" volumes: - ./code:/var/www/html </code></pre> later; run the following code and I entered the container kernel. <pre><code>docker exec -it phpx /bin/bash </code></pre> but there is no a directory called foo in / var / www / html. I wonder where I'm doing wrong. Can you help me?

52,754,409

2

0

null

2018-10-11 07:02:28.797 UTC

6

2021-11-03 11:19:35.77 UTC

null

2,363,892

null

1

47

docker|docker-compose|dockerfile

129,159

The reason is that you are mounting a volume from your host to <code>/var/www/html</code>. Step by step: <ol> <li><code>RUN mkdir -p /var/www/html/foo</code> creates the foo directory inside the filesystem of your container.</li> <li>docker-compose.yml <code>./code:/var/www/html</code> "hides" the content of <code>/var/www/html</code> in the container filesystem behind the contents of <code>./code</code> on the host filesystem.</li> </ol> So actually, when you exec into your container you see the contents of the <code>./code</code> directory on the host when you look at <code>/var/www/html</code>. Fix: Either you remove the volume from your docker-compose.yml or you create the <code>foo</code>-directory on the host before starting the container. Additional Remark: In your Dockerfile you declare a volume as <code>VOLUME ./code:/var/www/html</code>. This does not work and you should probably remove it. In a Dockerfile you cannot specify a path on your host. Quoting from <a href="https://docs.docker.com/v17.09/engine/reference/builder/#volume" rel="noreferrer">docker</a>: <blockquote> The host directory is declared at container run-time: The host directory (the mountpoint) is, by its nature, host-dependent. This is to preserve image portability. since a given host directory can’t be guaranteed to be available on all hosts. For this reason, you can’t mount a host directory from within the Dockerfile. The VOLUME instruction does not support specifying a host-dir parameter. You must specify the mountpoint when you create or run the container. </blockquote>

53,786,383

Validate nested objects using class validator and nestjs

I'm trying to validate nested objects using class-validator and NestJS. I've already tried following this <a href="https://stackoverflow.com/a/53685045/4694994">thread</a> by using the <code>@Type</code> decorator from class-transform and didn't have any luck. This what I have: DTO: <pre><code>class PositionDto { @IsNumber() cost: number; @IsNumber() quantity: number; } export class FreeAgentsCreateEventDto { @IsNumber() eventId: number; @IsEnum(FinderGamesSkillLevel) skillLevel: FinderGamesSkillLevel; @ValidateNested({ each: true }) @Type(() => PositionDto) positions: PositionDto[]; } </code></pre> I'm also using built-in nestjs validation pipe, this is my bootstrap: <pre><code>async function bootstrap() { const app = await NestFactory.create(ServerModule); app.useGlobalPipes(new ValidationPipe()); await app.listen(config.PORT); } bootstrap(); </code></pre> It's working fine for other properties, the array of objects is the only one not working.

53,786,899

3

null

2018-12-14 20:17:51.32 UTC

9

2021-11-18 04:24:57.427 UTC

2021-02-21 13:38:57.55 UTC

null

74,089

null

2,662,054

null

1

42

javascript|node.js|typescript|nestjs|class-validator

74,554

You are expecting <code>positions: [1]</code> to throw a 400 but instead it is accepted. According to this <a href="https://github.com/typestack/class-validator/issues/193#issuecomment-386877352" rel="noreferrer">Github issue</a>, this seems to be a bug in class-validator. If you pass in a primitive type (<code>boolean</code>, <code>string</code>, <code>number</code>,...) or an <code>array</code> instead of an object, it will accept the input as valid although it shouldn't. <hr> I don't see any standard workaround besides creating a <a href="https://github.com/typestack/class-validator#custom-validation-decorators" rel="noreferrer">custom validation decorator</a>: <pre><code>import { registerDecorator, ValidationOptions, ValidationArguments } from 'class-validator'; export function IsNonPrimitiveArray(validationOptions?: ValidationOptions) { return (object: any, propertyName: string) => { registerDecorator({ name: 'IsNonPrimitiveArray', target: object.constructor, propertyName, constraints: [], options: validationOptions, validator: { validate(value: any, args: ValidationArguments) { return Array.isArray(value) && value.reduce((a, b) => a && typeof b === 'object' && !Array.isArray(b), true); }, }, }); }; } </code></pre> and then use it in your dto class: <pre><code>@ValidateNested({ each: true }) @IsNonPrimitiveArray() @Type(() => PositionDto) positions: PositionDto[]; </code></pre>

6,188,197

Problem Storing Latitude and Longitude values in MySQL database

I want to store the values of latitude and longitude fetched from Google Maps GeoCoding API in a MySQL database. The values are in float format. <blockquote> 12.9274529 77.5905970 </blockquote> And when I want to store it in database (which is datatype float) it rounds up float and store it in following format: <blockquote> 12.9275 77.5906 </blockquote> Am I using the wrong datatype? If yes then what datatype should I be using to store latitude and longitude values? Update : here is the CREATE TABLE as requestted by Allin <pre><code>CREATE TABLE `properties` ( `id` int(11) NOT NULL AUTO_INCREMENT, `title` varchar(100) NOT NULL, `description` text, `latitude` float DEFAULT NULL, `longitude` float DEFAULT NULL, `landmark` varchar(50) DEFAULT NULL, PRIMARY KEY (`id`), UNIQUE KEY `serial` (`serial`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8 AUTO_INCREMENT=3 ; </code></pre>

6,188,256

7

8

null

2011-05-31 13:17:39.703 UTC

11

2014-09-13 21:44:21.417 UTC

2012-05-11 14:43:23.657 UTC

null

44,390

null

396,476

null

1

17

php|mysql|types|floating-point

28,059

You need to use <a href="http://dev.mysql.com/doc/refman/5.1/en/numeric-types.html" rel="noreferrer">decimal</a> if you don't want the numbers to be approximated. <blockquote> Fixed-Point (Exact-Value) Types The DECIMAL and NUMERIC types store exact numeric data values. These types are used when it is important to preserve exact precision, for example with monetary data. </blockquote> And now the "here you go" answer: Use <code>DECIMAL(10,7)</code>. Where <code>10</code> is the total number of digits in the number and <code>7</code> is the number of digits after the <code>.</code>. (This means that before the dot will be <code>3</code> digits.) Adjust these numbers as needed. Also please take a look at the manual entry I linked earlier in the answer.

6,036,793

SQL: how to use UNION and order by a specific select?

I have two selects: <pre><code>SELECT id FROM a -- returns 1,4,2,3 UNION SELECT id FROM b -- returns 2,1 </code></pre> I'm receiving correct num of rows, like: <code>1,4,2,3</code>. But I want <code>b</code> table results first: <code>2,1,4,3</code> or <code>2,1,3,4</code> How can I do this? (I'm using Oracle)

6,037,367

7

0

null

2011-05-17 20:36:06.323 UTC

5

2022-09-20 07:17:15.207 UTC

2011-06-26 06:37:35.24 UTC

null

570,191

null

411,247

null

1

26

sql|oracle|select|union

117,888

Using @Adrian tips, I found a solution: I'm using GROUP BY and COUNT. I tried to use DISTINCT with ORDER BY but I'm getting error message: "not a SELECTed expression" <pre><code>select id from ( SELECT id FROM a -- returns 1,4,2,3 UNION ALL -- changed to ALL SELECT id FROM b -- returns 2,1 ) GROUP BY id ORDER BY count(id); </code></pre> Thanks Adrian and <a href="http://oraclequirks.blogspot.com/2009/04/ora-01791-not-selected-expression.html" rel="noreferrer">this</a> blog.

5,735,791

Parser for Oracle SQL

For my current project I need a SQL parser that parses Oracle SQL statements. Currently I've been using jsqlparser, which worked well for simple queries. But when specific functions occur (e.g. cast() or (+)) the parser fails. Can anyone suggest a parser that is fully compliant to Oracle SQL? Best, Will

5,735,998

8

3

null

2011-04-20 19:48:09.573 UTC

9

2022-08-24 07:09:15.897 UTC

null

715,236

null

1

20

sql|oracle|parsing

35,174

Have you considered <a href="http://www.sqlparser.com/" rel="nofollow noreferrer">General SQL Parser</a>? I don't have any experience with it myself but browsing their website it has potential. Personally I have rolled my own built on the parser in Eclipse Data Tools Platform (sorry I can't share, it's proprietary), but now I will have to evaluate the one I linked above because it claims to have more coverage of Oracle SQL than my parser does.

5,867,834

assert() with message

I saw somewhere assert used with a message in the following way: <pre><code>assert(("message", condition)); </code></pre> This seems to work great, except that gcc throws the following warning: <pre><code>warning: left-hand operand of comma expression has no effect </code></pre> How can I stop the warning?

5,868,001

9

1

null

2011-05-03 09:54:06.493 UTC

13

2021-05-26 19:24:06.137 UTC

null

88,622

null

1

53

c|gcc|compiler-warnings|assert

50,594

Use <code>-Wno-unused-value</code> to stop the warning; (the option <code>-Wall</code> includes <code>-Wunused-value</code>). I think even better is to use another method, like <pre><code>assert(condition && "message"); </code></pre>

5,839,327

Custom form validation error message for Codeigniter 2

I have a drop down named "business_id". <pre><code><select name="business_id"> <option value="0">Select Business</option> More options... </select> </code></pre> Here comes the validation rule, user must select an option. <pre><code>$this->form_validation->set_rules('business_id', 'Business', 'greater_than[0]'); </code></pre> Problem being the error message says: The Business field must contain a number greater than 0. Not very intuitive! I want it to say "You must select a business". I tried: <pre><code>$this->form_validation->set_message('Business', 'You must select a business'); </code></pre> But CI complete ignores this. Does anyone have a solution for this?

5,839,586

10

0

null

2011-04-30 03:39:37.773 UTC

1

2016-03-31 10:50:25.44 UTC

2011-04-30 03:42:24.64 UTC

null

313,758

null

207,425

null

1

5

php|codeigniter|validation

38,828

Try not setting the value attribute on the default select... <pre><code><select name="business_id"> <option value>Select Business</option> More options... </select> </code></pre> and then just using required for your form validation rule... <pre><code>$this->form_validation->set_rules('business_id', 'Business', 'required'); </code></pre> I suppose you could try editing the way that you're trying to set the message also... <pre><code>$this->form_validation->set_message('business_id', 'You must select a business'); instead of $this->form_validation->set_message('Business', 'You must select a business'); </code></pre> I'm not entirely sure if that will do the trick though.

17,755,996

How to make a list as the default value for a dictionary?

I have a Python code that looks like: <pre><code>if key in dict: dict[key].append(some_value) else: dict[key] = [some_value] </code></pre> but I figure there should be some method to get around this 'if' statement. I tried: <pre><code>dict.setdefault(key, []) dict[key].append(some_value) </code></pre> and <pre><code>dict[key] = dict.get(key, []).append(some_value) </code></pre> but both complain about "TypeError: unhashable type: 'list'". Any recommendations?

17,756,005

1

5

null

2013-07-19 21:43:53.067 UTC

10

2021-12-09 09:50:15.83 UTC

2021-12-08 19:50:37.173 UTC

null

6,045,800

null

522,044

null

1

42

python|dictionary|default-value

49,840

The best method is to use <a href="http://docs.python.org/2/library/collections.html#collections.defaultdict"><code>collections.defaultdict</code></a> with a <code>list</code> default: <pre><code>from collections import defaultdict dct = defaultdict(list) </code></pre> Then just use: <pre><code>dct[key].append(some_value) </code></pre> and the dictionary will create a new list for you if the key is not yet in the mapping. <code>collections.defaultdict</code> is a subclass of <code>dict</code> and otherwise behaves just like a normal <code>dict</code> object. When using a standard <code>dict</code>, <code>dict.setdefault()</code> correctly sets <code>dct[key]</code> for you to the default, so that version should have worked just fine. You can chain that call with <code>.append()</code>: <pre><code>>>> dct = {} >>> dct.setdefault('foo', []).append('bar') # returns None! >>> dct {'foo': ['bar']} </code></pre> However, by using <code>dct[key] = dct.get(...).append()</code> you replace the value for <code>dct[key]</code> with the output of <code>.append()</code>, which is <code>None</code>.

39,343,031

Editorconfig: How to autofix all files in a project

Given I have an .editorconfig file that dictates consistent indent, line endings, trailing whitespace, etc. <pre><code># http://editorconfig.org root = true [*] indent_style = space indent_size = 2 end_of_line = lf charset = utf-8 trim_trailing_whitespace = true insert_final_newline = true </code></pre> As a Developer, I want to fix all files consistently with a command line tool that understands .editorconfig files. I want to avoid tedious tasks, for instance, manually open and change files. I imagine if there was a command like for example: <pre><code>editorconfix.sh --autofix . </code></pre> Which tools exist for this purpose? What scripts do you use?

41,655,803

2

1

null

2016-09-06 07:29:02.04 UTC

8

2020-05-07 08:28:44.71 UTC

null

109,305

null

1

30

editorconfig

13,195

There is <a href="https://www.npmjs.com/package/eclint" rel="noreferrer">eclint</a> (and a fork called <a href="https://www.npmjs.com/package/editorconfig-tools" rel="noreferrer">editorconfig-tools</a>). Run <pre><code>eclint check 'src/**/*' </code></pre> to check all files in the <code>src</code> directory, or <pre><code>eclint fix 'src/**/*' </code></pre> to fix them. But please note that the tool can produce some surprises when it comes to indentation! The author of the tool <a href="https://github.com/jedmao/eclint/issues/43#issuecomment-242929632" rel="noreferrer">says in a GitHub comment</a> that he has stopped using the tool himself in favour of language-specific linters: <blockquote> To me, EditorConfig is all about – would you believe it – configuring your editor and nothing more. I don't think it should be responsible for linting or fixing, as there are language-specific tools to accomplish those goals (e.g., ESLint for JavaScript). The only way you can reliably lint or fix indentation is to be aware of the language in question and EditorConfig is language agnostic. </blockquote>

9,708,656

How can I create a SQL function with a parameter?

The following code returns one field, a string, based on the input where it says "28". <pre><code>SELECT data.id, LTRIM(SYS_CONNECT_BY_PATH(name, ', '),',') conc_names FROM ( SELECT id, name, ROW_NUMBER() OVER (order by name) rownumber, COUNT(*) OVER () cnt FROM ( SELECT es.EVENT_ID as id, s.SERVICE_NAME as name FROM DT_SERVICES s JOIN DT_EVENT_SERVICE es ON s.SERVICE_ID = es.SERVICE_ID WHERE es.EVENT_ID = 28 ) ) data WHERE rownumber = cnt START WITH rownumber = 1 CONNECT BY PRIOR rownumber = rownumber-1; </code></pre> How can I create a SQL function out of this so that I can pass in whatever number (instead of 28) and the function would return whatever the result of that select turns out to be? I tried creating one but I keep getting compilation errors. Current SQL to create function <pre><code>create or replace function "DT_SERVICE_STRING" (id in VARCHAR2) return VARCHAR2 is begin DECLARE result VARCHAR(200); SELECT data.id, LTRIM(SYS_CONNECT_BY_PATH(name, ', '),',') conc_names INTO result FROM ( SELECT id, name, ROW_NUMBER() OVER (order by name) rownumber, COUNT(*) OVER () cnt FROM ( SELECT es.EVENT_ID as id, s.SERVICE_NAME as name FROM DT_SERVICES s JOIN DT_EVENT_SERVICE es ON s.SERVICE_ID = es.SERVICE_ID WHERE es.EVENT_ID = id ) ) data WHERE rownumber = cnt START WITH rownumber = 1 CONNECT BY PRIOR rownumber = rownumber-1; return result; end; </code></pre> Error: Compilation failed,line 7 (15:22:21) PLS-00103: Encountered the symbol "SELECT" when expecting one of the following: begin function pragma procedure subtype type current cursor delete exists prior

9,708,743

2

3

null

2012-03-14 19:16:24.327 UTC

null

2015-11-18 09:35:18.823 UTC

null

1,345,788

null

1,004,278

null

1

2

sql|oracle|plsql|oracle-apex

49,032

Assuming that you want a PL/SQL function that is callable from a SQL statement (you cannot have a function defined in SQL), it sounds like you want something like <pre><code>CREATE OR REPLACE FUNCTION get_conc_names( p_event_id IN dt_event_service.event_id%type ) RETURN VARCHAR2 IS l_conc_names VARCHAR2(32676); -- You may want a smaller variable if you know the result will be smaller BEGIN SELECT LTRIM(SYS_CONNECT_BY_PATH(name, ', '),',') conc_names INTO l_conc_names FROM ( SELECT id, name, ROW_NUMBER() OVER (order by name) rownumber, COUNT(*) OVER () cnt FROM (SELECT es.EVENT_ID as id, s.SERVICE_NAME as name FROM DT_SERVICES s JOIN DT_EVENT_SERVICE es ON s.SERVICE_ID = es.SERVICE_ID WHERE es.EVENT_ID = p_event_id ) ) data WHERE rownumber = cnt START WITH rownumber = 1 CONNECT BY PRIOR rownumber = rownumber-1; RETURN l_conc_names; END; </code></pre> Based on the code you just posted, it appears that you just need to get rid of the <code>DECLARE</code> and to move the declaration of the local variable <code>result</code> before the <code>BEGIN</code> and after the <code>IS</code>.

21,899,537

Can I use a DIV in an email template?

I am greatly confused about designing an email template for a mailchimp campaign. I want to know if I can use a <code>div</code> with a class of "Container" on my email template. Is using <code>div</code> tags supported by all mail clients? I am using DIV only for the container but in the inner part of the template I have used <code>table</code>, <code>tr</code> and <code>td</code> tags. Please let me know. Thanks.

21,910,689

3

1

null

2014-02-20 06:05:29.09 UTC

3

2018-09-25 06:01:49.34 UTC

2014-07-02 07:28:51.79 UTC

null

2,225,787

null

3,308,679

null

1

17

html|email|templates|mailchimp

51,769

You can use div, however tables are supported more consistently. If you try to go the div route, you'll find some of your CSS will fail. Also, by going with tables, it opens up the old school html attributes that only work in tables. These include <code>align</code>, <code>valign</code>, <code>bgcolor</code> etc, all of which are 100% supported, while their CSS equivalents have partial support. On a side note, here are <a href="https://stackoverflow.com/questions/2229822/best-practices-considerations-when-writing-html-emails/21437734#21437734">all the resources you will need</a> to get started in html email.

33,054,229

Accessing attributes on literals work on all types, but not `int`; why?

I have read that everything in python is an object, and as such I started to experiment with different types and invoking <code>__str__</code> on them — at first I was feeling really excited, but then I got confused. <pre><code>>>> "hello world".__str__() 'hello world' >>> [].__str__() '[]' >>> 3.14.__str__() '3.14' >>> 3..__str__() '3.0' >>> 123.__str__() File "<stdin>", line 1 123.__str__() ^ SyntaxError: invalid syntax </code></pre> <ul> <li>Why does <code>something.__str__()</code> work for "everything" besides <code>int</code>?</li> <li>Is <code>123</code> not an object of type <code>int</code>?</li> </ul>

33,054,230

4

2

null

2015-10-10 12:55:24.207 UTC

5

2015-10-14 14:35:00.08 UTC

2015-10-14 07:46:25.2 UTC

null

100,297

null

1,090,079

null

1

55

python|python-2.7|python-3.x|language-lawyer

2,639

<h3>So you think you can <strike> dance </strike> floating-point?</h3> <code>123</code> is just as much of an object as <code>3.14</code>, the "problem" lies within the grammar rules of the language; the parser thinks we are about to define a float — not an int with a trailing method call. We will get the expected behavior if we wrap the number in parenthesis, as in the below. <pre><code>>>> (123).__str__() '123'</code></pre> Or if we simply add some whitespace after <code>123</code>: <pre><code>>>> 123 .__str__() '123'</code></pre> The reason it does not work for <code>123.__str__()</code> is that the dot following the <code>123</code> is interpreted as the decimal-point of some partially declared floating-point. <pre><code>>>> 123.__str__() File "", line 1 123.__str__() ^ SyntaxError: invalid syntax</code></pre> The parser tries to interpret <code>__str__()</code> as a sequence of digits, but obviously fails — and we get a SyntaxError basically saying that the parser stumbled upon something that it did not expect. <hr> <h3>Elaboration</h3> When looking at <code>123.__str__()</code> the python parser could use either 3 characters and interpret these 3 characters as an integer, or it could use 4 characters and interpret these as the start of a floating-point. <pre><code>123.__str__() ^^^ - int </code></pre> <pre><code>123.__str__() ^^^^- start of floating-point </code></pre> Just as a little child would like as much cake as possible on their plate, the parser is greedy and would like to swallow as much as it can all at once — even if this isn't always the best of ideas —as such the latter ("better") alternative is chosen. When it later realizes that <code>__str__()</code> can in no way be interpreted as the decimals of a floating-point it is already too late; SyntaxError. <blockquote> Note <pre><code> 123 .__str__() # works fine </code></pre> In the above snippet, <code>123 </code> (note the space) must be interpreted as an integer since no number can contain spaces. This means that it is semantically equivalent to <code>(123).__str__()</code>. </blockquote> <blockquote> Note <pre><code> 123..__str__() # works fine </code></pre> The above also works because a number can contain at most one decimal-point, meaning that it is equivalent to <code>(123.).__str__()</code>. </blockquote> <hr> <h3>For the language-lawyers</h3> This section contains the lexical definition of the relevant literals. <a href="https://docs.python.org/3.5/reference/lexical_analysis.html#floating-point-literals">Lexical analysis - 2.4.5 Floating point literals</a> <pre><code>floatnumber ::= pointfloat | exponentfloat pointfloat ::= [intpart] fraction | intpart "." exponentfloat ::= (intpart | pointfloat) exponent intpart ::= digit+ fraction ::= "." digit+ exponent ::= ("e" | "E") ["+" | "-"] digit+ </code></pre> <a href="https://docs.python.org/3.5/reference/lexical_analysis.html#integer-literals">Lexical analysis - 2.4.4 Integer literals</a> <pre><code>integer ::= decimalinteger | octinteger | hexinteger | bininteger decimalinteger ::= nonzerodigit digit* | "0"+ nonzerodigit ::= "1"..."9" digit ::= "0"..."9" octinteger ::= "0" ("o" | "O") octdigit+ hexinteger ::= "0" ("x" | "X") hexdigit+ bininteger ::= "0" ("b" | "B") bindigit+ octdigit ::= "0"..."7" hexdigit ::= digit | "a"..."f" | "A"..."F" bindigit ::= "0" | "1" </code></pre>

10,365,624

"sys.getsizeof(int)" returns an unreasonably large value?

I want to check the size of int data type in python: <pre><code>import sys sys.getsizeof(int) </code></pre> It comes out to be "436", which doesn't make sense to me. Anyway, I want to know how many bytes (2,4,..?) int will take on my machine.

10,365,639

1

null

2012-04-28 16:59:15.863 UTC

24

2021-10-18 16:13:39.48 UTC

2012-04-28 17:31:59.44 UTC

user166390

null

1,040,752

null

1

60

python

53,841

<h3>The short answer</h3> You're getting the size of the class, not of an instance of the class. Call <code>int</code> to get the size of an instance: <pre><code>>>> sys.getsizeof(int()) 24 </code></pre> If that size still seems a little bit large, remember that a Python <code>int</code> is very different from an <code>int</code> in (for example) c. In Python, an <code>int</code> is a fully-fledged object. This means there's extra overhead. Every Python object contains at least a refcount and a reference to the object's type in addition to other storage; on a 64-bit machine, that takes up 16 bytes! The <code>int</code> internals (as determined by the standard CPython implementation) have also changed over time, so that the amount of additional storage taken depends on your version. <h3>Some details about <code>int</code> objects in Python 2 and 3</h3> Here's the situation in Python 2. (Some of this is adapted from a blog post by <a href="http://www.laurentluce.com/posts/python-integer-objects-implementation/" rel="noreferrer">Laurent Luce</a>). Integer objects are represented as blocks of memory with the following structure: <pre class="lang-c prettyprint-override"><code>typedef struct { PyObject_HEAD long ob_ival; } PyIntObject; </code></pre> <code>PyObject_HEAD</code> is a macro defining the storage for the refcount and the object type. It's described in some detail by the <a href="https://docs.python.org/c-api/structures.html" rel="noreferrer">documentation</a>, and the code can be seen in <a href="https://stackoverflow.com/questions/11736762/why-pyobject-can-point-to-any-object-in-python">this</a> answer. The memory is allocated in large blocks so that there's not an allocation bottleneck for every new integer. The structure for the block looks like this: <pre class="lang-c prettyprint-override"><code>struct _intblock { struct _intblock *next; PyIntObject objects[N_INTOBJECTS]; }; typedef struct _intblock PyIntBlock; </code></pre> These are all empty at first. Then, each time a new integer is created, Python uses the memory pointed at by <code>next</code> and increments <code>next</code> to point to the next free integer object in the block. I'm not entirely sure how this changes once you exceed the storage capacity of an ordinary integer, but once you do so, the size of an <code>int</code> gets larger. On my machine, in Python 2: <pre><code>>>> sys.getsizeof(0) 24 >>> sys.getsizeof(1) 24 >>> sys.getsizeof(2 ** 62) 24 >>> sys.getsizeof(2 ** 63) 36 </code></pre> In Python 3, I think the general picture is the same, but the size of integers increases in a more piecemeal way: <pre><code>>>> sys.getsizeof(0) 24 >>> sys.getsizeof(1) 28 >>> sys.getsizeof(2 ** 30 - 1) 28 >>> sys.getsizeof(2 ** 30) 32 >>> sys.getsizeof(2 ** 60 - 1) 32 >>> sys.getsizeof(2 ** 60) 36 </code></pre> These results are, of course, all hardware-dependent! YMMV. The variability in integer size in Python 3 is a hint that they may behave more like variable-length types (like lists). And indeed, this turns out to be true. Here's the definition of the <a href="https://github.com/python/cpython/blob/ba85d69a3e3610bdd05f0dd372cf4ebca178c7fb/Include/longintrepr.h#L85" rel="noreferrer">C <code>struct</code></a> for <code>int</code> objects in Python 3: <pre class="lang-c prettyprint-override"><code>struct _longobject { PyObject_VAR_HEAD digit ob_digit[1]; }; </code></pre> The <a href="https://github.com/python/cpython/blob/ba85d69a3e3610bdd05f0dd372cf4ebca178c7fb/Include/longintrepr.h#L70" rel="noreferrer">comments</a> that accompany this definition summarize Python 3's representation of integers. Zero is represented not by a stored value, but by an object with size zero (which is why <code>sys.getsizeof(0)</code> is <code>24</code> bytes while <code>sys.getsizeof(1)</code> is <code>28</code>). Negative numbers are represented by objects with a negative size attribute! So weird.

19,071,601

How do I run multiple Python test cases in a loop?

I am new to Python and trying to do something I do often in Ruby. Namely, iterating over a set of indices, using them as argument to function and comparing its results with an array of fixture outputs. So I wrote it up like I normally do in Ruby, but this resulted in just one test case. <pre><code> def test_output(self): for i in range(1,11): .... self.assertEqual(fn(i),output[i]) </code></pre> I'm trying to get the test for every item in the range. How can I do that?

19,071,738

4

1

null

2013-09-28 20:58:11.2 UTC

7

2018-08-24 12:14:22.177 UTC

null

32,816

null

1

34

python|python-unittest

36,719

Using unittest you can show the difference between two sequences all in one test case. <pre><code>seq1 = range(1, 11) seq2 = (fn(j) for j in seq1) assertSequenceEqual(seq1, seq2) </code></pre> If that's not flexible enough, using unittest, it is possible to generate multiple tests, but it's a bit tricky. <pre><code>def fn(i): ... output = ... class TestSequence(unittest.TestCase): pass for i in range(1,11): testmethodname = 'test_fn_{0}'.format(i) testmethod = lambda self: self.assertEqual(fn(i), output[i]) setattr(TestSequence, testmethodname, testmethod) </code></pre> Nose makes the above easier through <a href="http://nose.readthedocs.org/en/latest/writing_tests.html#test-generators" rel="noreferrer">test generators</a>. <pre><code>import nose.tools def test_fn(): for i in range(1, 11): yield nose.tools.assert_equals, output[i], fn(i) </code></pre> Similar questions: <ul> <li><a href="https://stackoverflow.com/questions/2798956/python-unittest-generate-multiple-tests-programmatically">Python unittest: Generate multiple tests programmatically?</a></li> <li><a href="https://stackoverflow.com/questions/32899/how-to-generate-dynamic-parametrized-unit-tests-in-python">How to generate dynamic (parametrized) unit tests in python?</a></li> </ul>

37,629,860

Automatically resizing textarea in bootstrap

I found the following very simple way to automatically adjust a textarea to the text height in this jsfiddle <a href="http://jsfiddle.net/tovic/gLhCk/" rel="noreferrer">http://jsfiddle.net/tovic/gLhCk/</a>: <div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false"> <div class="snippet-code"> <pre class="snippet-code-js lang-js prettyprint-override"><code>function expandTextarea(id) { document.getElementById(id).addEventListener('keyup', function() { this.style.overflow = 'hidden'; this.style.height = 0; this.style.height = this.scrollHeight + 'px'; }, false); } expandTextarea('txtarea');</code></pre> <pre class="snippet-code-css lang-css prettyprint-override"><code>body { padding:50px; } textarea { margin:0px 0px; padding:5px; height:16px; line-height:16px; width:96%; display:block; margin:0px auto; }</code></pre> <pre class="snippet-code-html lang-html prettyprint-override"><code><textarea id="txtarea" spellcheck="false" placeholder="Statusku..."></textarea></code></pre> </div> </div> However, I'm using bootstrap in my project and this introduces problems. <ol> <li>The textarea is only 4px high instead of 16. It seems like bootstrap changes the way margins and paddings and heights work?</li> <li>When hitting enter, the text is jumping up and down, which is irritating to the eye.</li> </ol> I tried to delete all bootstrap classes in the HTML inspector of my browser but the problem was still there. Does anyone have an idea how to resolve this? Here's the code when bootstrap's CSS is added: <div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false"> <div class="snippet-code"> <pre class="snippet-code-js lang-js prettyprint-override"><code>function expandTextarea(id) { document.getElementById(id).addEventListener('keyup', function() { this.style.overflow = 'hidden'; this.style.height = 0; this.style.height = this.scrollHeight + 'px'; }, false); } expandTextarea('txtarea');</code></pre> <pre class="snippet-code-css lang-css prettyprint-override"><code>body { padding:50px; } textarea { margin:0px 0px; padding:5px; height:16px; line-height:16px; width:96%; display:block; margin:0px auto; }</code></pre> <pre class="snippet-code-html lang-html prettyprint-override"><code> <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" integrity="sha384-1q8mTJOASx8j1Au+a5WDVnPi2lkFfwwEAa8hDDdjZlpLegxhjVME1fgjWPGmkzs7" crossorigin="anonymous"> <textarea id="txtarea" spellcheck="false" placeholder="Statusku..."></textarea></code></pre> </div> </div>

37,630,464

8

1

null

2016-06-04 11:47:18.797 UTC

1

2020-09-25 10:21:37.777 UTC

2018-12-04 06:36:56.797 UTC

null

3,022,127

null

3,022,127

null

1

10

css|twitter-bootstrap|textarea

40,812

Thanks for all your answers, it gave me valuable insights into what I had to change. In the end, a bit more padding-bottom in the css did the trick. <div class="snippet" data-lang="js" data-hide="false" data-console="true"> <div class="snippet-code"> <pre class="snippet-code-js lang-js prettyprint-override"><code>function expandTextarea(id) { document.getElementById(id).addEventListener('keyup', function() { this.style.overflow = 'hidden'; this.style.height = 0; this.style.height = this.scrollHeight + 'px'; }, false); } expandTextarea('txtarea');</code></pre> <pre class="snippet-code-css lang-css prettyprint-override"><code>body { padding:50px; } textarea { /* margin:0px 0px; this is redundant anyways since its specified below*/ padding-top:10px; padding-bottom:25px; /* increased! */ /* height:16px; */ /* line-height:16px; */ width:100%; /* changed from 96 to 100% */ display:block; /* margin:0px auto; not needed since i have width 100% now */ }</code></pre> <pre class="snippet-code-html lang-html prettyprint-override"><code> <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" integrity="sha384-1q8mTJOASx8j1Au+a5WDVnPi2lkFfwwEAa8hDDdjZlpLegxhjVME1fgjWPGmkzs7" crossorigin="anonymous"> <textarea id="txtarea" spellcheck="false" placeholder="Statusku..."></textarea></code></pre> </div> </div>

3,988,995

How can I filter a dictionary using LINQ and return it to a dictionary from the same type

I have the following dictionary: <pre><code>Dictionary<int,string> dic = new Dictionary<int,string>(); dic[1] = "A"; dic[2] = "B"; </code></pre> I want to filter the dictionary's items and reassign the result to the same variable: <pre><code>dic = dic.Where (p => p.Key == 1); </code></pre> How can I return the result as a dictionary from the same type [<code><int,string></code>] ? I tried <code>ToDictionary</code>, but it doesn't work.

3,989,017

1

null

2010-10-21 15:13:39.973 UTC

13

2021-11-17 22:48:13.843 UTC

null

8,239,061

null

322,355

null

1

110

c#|linq|dictionary|linq-to-objects

76,814

<code>ToDictionary</code> is the way to go. It does work - you were just using it incorrectly, presumably. Try this: <pre><code>dic = dic.Where(p => p.Key == 1) .ToDictionary(p => p.Key, p => p.Value); </code></pre> Having said that, I assume you really want a different <code>Where</code> filter, as your current one will only ever find one key...

18,547,855

Permission Denied when writing log file

I'm using ubuntu 13.04. I'm running uwsgi using <code>sudo service uwsgi start</code> I've configured log file in django as <code>/home/shwetanka/logs/mysite/mysite.log</code> But I'm getting this error - <pre><code>ValueError: Unable to configure handler 'file': [Errno 13] Permission denied: '/home/shwetanka/logs/mysite/mysite.log' </code></pre> How do I fix it? This should not happen when I run uwsgi as sudo.

18,547,916

2

0

null

2013-08-31 11:54:22.777 UTC

5

2015-08-16 08:49:04.203 UTC

null

390,230

null

1

22

django|ubuntu|uwsgi

50,986

You need to fix permissions with the <code>chmod</code> command, like this: <code>chmod 775 /home/shwetanka/logs/mysite/mysite.log</code>. Take a look at the owner of the file with <code>ls -l /home/shwetanka/logs/mysite/mysite.log</code> and make it writable to <code>uwsgi</code>. If the file isn't owned by <code>uwsgi</code>, you'll have to use the <code>chown</code> command. Take a look at the username under which your service is running with <code>ps aux | grep 'uwsgi'</code>. If the security isn't so important to you at the moment, use <code>chmod 777 /home/shwetanka/logs/mysite/mysite.log</code> and that's it. But that's not the way how this is done. The safest way to do this would be to check the owner and the group of the file and then change them if necessary and adjust the permissions accordingly. Let's give an example. If I have a file in <code>/home/shwetanka/logs/mysite/mysite.log</code> and the command <code>ls -l /home/shwetanka/logs/mysite/mysite.log</code> gives the following output: <pre><code>-rw-rw-r-- 1 shwetanka shwetanka 1089 Aug 26 18:15 /home/shwetanka/logs/mysite/mysite.log </code></pre> it means that the owner of the file is <code>shwetanka</code> and the group is also <code>shwetanka</code>. Now let's read the <code>rwx</code> bits. First group is related to the file owner, so <code>rw-</code> means that the file is readable and writable by the owner, readable and writeable by the group and readable by the others. You must make sure that the owner of the file is the service that's trying to write something to it or that the file belongs to group of the service or you'll get a <code>permission denied</code> error. Now if I have a username <code>uwsgi</code> that's used by the USWGI service and want the above file to be writable by that service, I have to change the owner of the file, like this: <code>chown uwsgi /home/shwetanka/logs/mysite/mysite.log</code>. Since the write bit for the owner (the first <code>rwx</code> group) is already set to <code>1</code>, that file will now be writable by the UWSGI service. For any further questions, please leave a comment.

8,650,007

Regular expression for twitter username

I need a javascript regular expression to match twitter usernames. The username is entered by the user while signing up, so I don't want to distract them with too many error notifications. Because of that, I need the expression to match valid usernames regardles if they have the @ before the username or not. Twitter usernames can contain latin characters, underscores and numbers, and the only limitation is the can be up to 15 characters long. ( but I need the regex to match 16 characters as well, in case someone enters the @ before the username ).

8,650,024

10

1

null

2011-12-27 22:37:07.307 UTC

7

2022-01-02 17:53:41.43 UTC

null

1,104,197

null

1

37

javascript|regex

34,256

This should do: <code>^@?(\w){1,15}$</code>