RazinAleks/SO-Python_QA-API_USAGE_class · Datasets at Hugging Face

4,605,243

2011-01-05T14:37:00.000

2

1

0

python,web,yahoo

0

4,605,394

0

6

0

true

1

0

Phisical architecture of web application can be different from the logical one visible through browser. Basically it is achieved by putting front web server (think of apache with mod_proxy, but it can be any other moder web server supporting reverse proxying) and mounting web application servers (java/python/whatever) to different paths (like /app1 for java app, /app1/subapp for python app, /app2 for php app). Of course those applications work independently by default, so if you want to pass some data between you have to establish some communication between (direct socket-to-socket or indirect with some messaging middleware or database). In general it is very broad topic, so if you're interested, try with some basic keywords: application servers, load balancing, reverse proxy, url rewriting.

4

0

I was watching the tutorials for python and the guy told that he coded the Address books and spell checker for yahoo mail in python. Now initially i was thinking that if i build the website then i have to use one language either php or java or asp or anything. But i am confused how can we make make separate modules in diff languages and combine to make one website Any ideas

Is it possible to use different technologies in one website

1

1.2

1

0

99

4,605,243

2011-01-05T14:37:00.000

0

1

0

python,web,yahoo

0

4,605,290

0

6

0

false

1

0

I know in Ruby on Rails, you can execute bash commands. Example: puts ls

4

0

I was watching the tutorials for python and the guy told that he coded the Address books and spell checker for yahoo mail in python. Now initially i was thinking that if i build the website then i have to use one language either php or java or asp or anything. But i am confused how can we make make separate modules in diff languages and combine to make one website Any ideas

Is it possible to use different technologies in one website

1

0

1

0

99

4,605,243

2011-01-05T14:37:00.000

1

0

python,web,yahoo

0

4,605,266

0

6

0

false

1

0

You can use any language to provide a web service, so you can for example provide a REST/SOAP web service that returns JSON or XML. The web service can be written in any language, and the language used to interact with the web service can be any language, as all languages nowadays have JSON and XML parsers. You can setup different subdomains to be used by different servers and setup those applications in any language you'd like.

4

0

I was watching the tutorials for python and the guy told that he coded the Address books and spell checker for yahoo mail in python. Now initially i was thinking that if i build the website then i have to use one language either php or java or asp or anything. But i am confused how can we make make separate modules in diff languages and combine to make one website Any ideas

Is it possible to use different technologies in one website

1

0.033321

1

0

99

4,613,251

2011-01-06T09:02:00.000

3

0

python,django,data-structures

0

4,613,300

0

2

0

true

1

0

You don't need a table per stock symbol, you just need one of the fields in the table to be the stock symbol. The table might be called StockPrices and its fields might be ticker_symbol - the stock ticker symbol time - the time of the stock quote price - the price of the stock at that time As long as ticker_symbol is an indexed field you can do powerful queries like SELECT time,price FROM StockPrices WHERE ticker_symbol='GOOG' ORDER BY time DESC and they will be very efficient. You can also store as many symbols as you like in this table. You could add other tables for dividends, volume information and such. In all cases you probably have a composite key of ticker_symbol and time.

1

0

I'm developing a web app that uses stock data. The stock data can be stored in: Files DB The structure of the data is simple: there's a daily set and a weekly set. If files are used, then I can store a file per symbol/set, such as GOOGLE_DAILY and GOOGLE_WEEKLY. Each set includes a simple list of (Date, open/hight/low/close, volume, dividend) fields. But how can I do it with DB? Should I use relational or other db? I thought about using 2 tables per each symbol, but that would generate thousands of tables, which doesn't feel right. Thanks.

Help needed with db structure

0

1.2

1

0

81

4,619,392

2011-01-06T20:15:00.000

0

python,mysql,virtual-machine

0

4,621,472

0

3

0

false

0

Do you want it synced in realtime? Why not just connect the guest's mysql process to the host?

2

1

0

Im setting a VM. Both host and VM machine have Mysql. How do keep the VM Mysql sync'd to to the host Mysql. Host is using MYsql 5.5 on XP. VM is Mysql 5.1 on Fedora 14. 1) I could DUMP to "shared," Restore. Not sure if this will work. 2) I could network Mysql Host to Mysql VM. Not how to do this How would I do this with python 2.7? I dont want them in sync after set-up phase. But, maybe sync some tables or SP occasionly on-rewrites. After I build out Linux Env. I would like to be able to convert V2P and have a dual-boot system.

How to Sync MySQL with python?

0

1

0

2,319

4,619,392

2011-01-06T20:15:00.000

1

0

python,mysql,virtual-machine

0

4,619,503

0

3

0

true

0

You can use mysqldump to make snapshots of the database, and to restore it to known states after tests. But instead or going into the complication of synchronizing different database instances, it would be best to open the host machine's instance to local network access, and have the applications in the virtual machine access that as if it was a remote server. Overall performance should improve too. Even if you decide to run different databases for the host and the guest, run then both on the host's MySQL instance. Performance will be better, configuration management will be easier, and the apps in the guest will be tested against a realistic deployment environment.

2

1

0

Im setting a VM. Both host and VM machine have Mysql. How do keep the VM Mysql sync'd to to the host Mysql. Host is using MYsql 5.5 on XP. VM is Mysql 5.1 on Fedora 14. 1) I could DUMP to "shared," Restore. Not sure if this will work. 2) I could network Mysql Host to Mysql VM. Not how to do this How would I do this with python 2.7? I dont want them in sync after set-up phase. But, maybe sync some tables or SP occasionly on-rewrites. After I build out Linux Env. I would like to be able to convert V2P and have a dual-boot system.

How to Sync MySQL with python?

0

1.2

1

0

2,319

4,621,447

2011-01-07T00:28:00.000

3

0

1

0

1

python,string,mkdir

0

4,621,460

0

3

0

false

0

construct your paths with os.path, then it's platform agnostic and you'll avoid these issues. For example, mkdir(os.path.join(r"C:\", "6")) or os.path.join(r"D:\", "main", "folder", "red", "34")

1

0

I had a bad problem with these two: "\" and "/" in Windows, obviously :\ I need to replace all \ occurrence in /, so I can use replace() because doesn't work with this "\6" for example. What I have to do? I want "only" use mkdir() to replicate a structure of folders (without files) from one location to another. So I use mainly os.walk() and mkdir(); everything work well till is found a folder named with numeber. Infact mkdir can do this: mkdir("C:\folder") and also mkdir("C:\newfolder") but NOT mkdir("C:\6") for example, because it would mkdir("C:/6"). But I don't know how to pass to it a path with slash and not backslash, because, as I said, I don't write manually the path, but come from "dirname" of os.walk(). I know that exist os.path.normcase and os.path.normpath, but they convert forward slashes to backward slashes. I need "only" to replicate a structure of folders, and unfortunately, many folders are named with number....What can I do? Thank You Very Much P.S.: Path are not simple like example... a more realistic example could be "D:\main\folder\blue\sky\34"

From backslash to slash (to create folders named with number)

0

0.197375

1

0

5,295

4,622,988

2011-01-07T06:18:00.000

2

0

python,algorithm

0

4,623,782

0

4

0

false

0

Make a dict {graticule: [users]} (a "graticule" is a block of 1 degree latitude x 1 degree longitude; so you can basically just round the values). To find nearby users, first get users from the same and adjacent graticules (since the target could be near an edge), then filter them with a basic bounding-box test (i.e. what are the minimum longitude/latitude that are possible for someone within the desired radius), then do a detailed test (if you need accuracy then you are in for some more complex math than just Pythagoras).

1

4

0

I have a python program sitting in server side managing user location informations, each friend has a pair of (longtitude, latitude), given a (longtitude, latitude) point, how I can find the nearby(say within 5KM) friends efficiently? I have 10K users online... Thanks. Bin

algorithm to find the nearby friends?

0

0.099668

1

0

1

2,000

4,625,835

2011-01-07T13:18:00.000

2

0

python,django,oracle,django-models,model

0

6,583,775

0

1

true

1

0

The solution was to add an index.

1

2

0

I work with Oracle Database and lastest Django but when i use the default user model is the query very slow what can i do?

how can i optimize a django oracle connection?

0

1.2

1

0

305

4,625,844

2011-01-07T13:19:00.000

-3

0

1

0

python,google-app-engine,jquery

0

4,625,942

0

3

0

false

0

I believe you need to create a route for the app engine, and call that route with jQuery. --EDIT-- The below turns out to be really really untrue, so don't mind it!!! I'm not going to remove it 'cause that would be lame. I have done some work with the Python SDK and tiny bit with the Java SDK, and doing so I felt the Python SDK was falling behind. More experienced programmers seem to disagree, hence this edit. Have to warn you though, Google is focussing more on the Java platform than the Python platform; very often extra work is involved to achieve the same results as with Java, and sometimes things are simply unsupported. What is your focus here? To learn Python or to learn Python with GAE?

1

0

i am learning python with GAE and for interface use jquery so i want to know calling python function using jquery.

how to call python function using jquery?

0

-0.197375

1

0

1,919

4,630,723

2011-01-07T22:07:00.000

4

0

1

0

python,random

0

4,630,743

0

5

0

false

0

To guarantee that there will be the same number of zeros and ones you can generate a list containing n/2 zeros and n/2 ones and shuffle it with random.shuffle. For small n, if you aren't happy that the result passes your acceptance criteria (e.g. not too many consecutive equal numbers), shuffle again. Be aware that doing this reduces the randomness of the result, not increases it. For larger n it will take too long to find a result that passes your criteria using this method (because most results will fail). Instead you could generate elements one at a time with these rules: If you already generated 4 ones in a row the next number must be zero and vice versa. Otherwise, if you need to generate x more ones and y more zeros, the chance of the next number being one is x/(x+y).

2

1

0

Here's the problem: I try to randomize n times a choice between two elements (let's say [0,1] -> 0 or 1), and my final list will have n/2 [0] + n/2 [1]. I tend to have this kind of result: [0 1 0 0 0 1 0 1 1 1 1 1 1 0 0, until n]: the problem is that I don't want to have serially 4 or 5 times the same number so often. I know that I could use a quasi randomisation procedure, but I don't know how to do so (I'm using Python).

Using Python for quasi randomization

0

0.158649

1

0

588

4,630,723

2011-01-07T22:07:00.000

1

0

1

0

python,random

0

4,630,745

0

5

0

false

0

Having 6 1's in a row isn't particularly improbable -- are you sure you're not getting what you want? There's a simple Python interface for a uniformly distributed random number, is that what you're looking for?

2

1

0

Here's the problem: I try to randomize n times a choice between two elements (let's say [0,1] -> 0 or 1), and my final list will have n/2 [0] + n/2 [1]. I tend to have this kind of result: [0 1 0 0 0 1 0 1 1 1 1 1 1 0 0, until n]: the problem is that I don't want to have serially 4 or 5 times the same number so often. I know that I could use a quasi randomisation procedure, but I don't know how to do so (I'm using Python).

Using Python for quasi randomization

0

0.039979

1

0

588

4,638,806

2011-01-09T11:07:00.000

0

1

python,pydot

0

4,844,143

0

1

0

true

0

1

I found out that writing the string in unicode representation shows mathematical symbols as edges... For example you can write node = pydot.Node("ε",shape = "ellipse", style="filled", fillcolor="turquoise") Using this we get epsilon as label of the node.... Similarly we can get rest of the mathematical symbols....

1

0

I am having problem with drawing in pydot. The problem lies in defining the layout of the nodes created. Currently everything is drawn vertically and is not spread. This gives me the problem of going down to see the nodes created. Is there any way I can define the nodes to be created horizontally whenever they are very large in number?? Also I want to display mathematical symbols in the labels. But I have not been able to find how to do that. If anyone knows please do tell how I can write epsilon and lambda in the labels from one node to another.... Thanks a lot...

changing layout and inserting mathematical symbols with pydot

0

1.2

1

0

419

4,643,247

2011-01-10T02:33:00.000

1

0

1

0

python,wxpython

0

4,643,279

0

3

1

false

0

1

I suggest both, script for all platforms and frozen binary for lazy windows users. To answer your latest question, you don't compile python. Python is an interpreted language, it gets compiled on the fly when run. A python frozen binary is actually the python interpreter with your script hardcoded in it. And frozen binaries are windows-only, AFAIK. Besides, Unix and MacOS (usually) come with python pre-installed.

1

3

0

I have a wxPython application that is almost done & I would like to place it in my portfolio. I have to consider when someone attempts to run my app that they may not have Python, or wxPython, so if they just click the main script/python file its not going to run, right? How should I distribute my app (how do you distribute ur apps) so that it can be run & also so that it could be run on the 3 major OS's (Unix, Windows, MacOSX)? I know of py2exe for releasing under windows, but what can I use for Unix & MacOSX to compile the program? Whats the easiest way?

Releasing a wxPython App: Give out scripts or compile in Exe, etc?

0

0.066568

1

0

1,685

4,651,172

2011-01-10T20:27:00.000

24

0

python,django,django-templates

0

4,651,237

0

4

0

false

1

0

{{ data.0 }} should work. Let's say you wrote data.obj django tries data.obj and data.obj(). If they don't work it tries data["obj"]. In your case data[0] can be written as {{ data.0 }}. But I recommend you to pull data[0] in the view and send it as separate variable.

1

137

0

This may be simple, but I looked around and couldn't find an answer. What's the best way to reference a single item in a list from a Django template? In other words, how do I do the equivalent of {{ data[0] }} within the template language?

Reference list item by index within Django template?

1

0

132,262

4,651,239

2011-01-10T20:33:00.000

2

0

1

0

python,scheduler

0

4,651,287

0

2

0

false

0

That's not the best solution. It's no guarantee you are locked out for more than one second. You should stick to 0.5 second resolution (or worse if no lives depend on it) and fire the event whenever it is at or past the due time, and keep a flag per event if it has been fired. Then it will always be fired at exactly once, and as close to the target time as achievable.

1

0

I'm creating an alarm clock in python and have a simple question: My alarm clock's resolution needs to be down to the second. Currently I have a thread that wakes every 0.5 seconds, and checks whether its time to start making noise. My only concern is that somehow the system gets completely overloaded at some point and the alarm does not sound because the alarm clock thread was still sleeping during the second it was supposed to check the time. So my question is, would checking every 0.05 seconds be better? Or is there a way to register an event handler with python for a specific time, so I dont have to keep checking the time myself.

Simple alarm clock and checking time every second

1

0.197375

1

0

1,365

4,652,472

2011-01-10T22:56:00.000

28

0

1

0

python,vim

0

4,661,417

0

3

0

true

0

To best answer your initial question: "How to install python syntax support in Vim": There is no need to install anything! If you have not made any modifications (e.g. no configuration changes for vim in ~/.vimrc) try the following: Open a Python file with vim type the following command :syntax on You should now have VIM properly highlight your Python file. To avoid having to re-type those command over and over again, I would suggest you keep a configuration file for VIM. This is usually located in your home directory, if there is not one there already, create a ~/.vimrc file and add the syntax on directive there to have VIM automatically highlight your Python files. If you need to know more about structure/installation of plugins, then Senthil's answer is better suited :)

2

14

0

I recently started programming in python and have fallen in love with Vim over the past few weeks. I know want to use Vim as my primary editor for python files. I know there are python plugins for Vim, but I am very confused as to where/how I can install these. I don't really understand where Vim is installed. I'm running the latest version of Mac OS X Snow Leopard. Any help would be greatly appreciated. Thanks!

How to install python syntax support for Vim on Mac OSX?

1

1.2

1

0

21,812

4,652,472

2011-01-10T22:56:00.000

0

1

0

python,vim

0

36,414,972

0

3

0

false

0

for mac os x, the vimrc file is located in /usr/share/vim directory edit the vimdc file with any text editor. Add the syntax on to the last line of the file. Then next time you start a file you can see color. This is a system wide setting. In other linux flavor it may be located in /etc/ you can find this file by find /etc -name vimdc. The edit will affect all the users on the machine. These setting can overwritten by the $HOME/.vimrc file. In your home you may also have a .vim directory. To check that you have these, do ls -a in your home directory.

2

14

0

I recently started programming in python and have fallen in love with Vim over the past few weeks. I know want to use Vim as my primary editor for python files. I know there are python plugins for Vim, but I am very confused as to where/how I can install these. I don't really understand where Vim is installed. I'm running the latest version of Mac OS X Snow Leopard. Any help would be greatly appreciated. Thanks!

How to install python syntax support for Vim on Mac OSX?

1

0

1

0

21,812

4,656,923

2011-01-11T11:06:00.000

0

1

0

python,events,google-app-engine,login,hook

0

4,663,607

0

2

0

false

1

0

I'm using Python on GAE (so it may be different for Java) but have seen no documentation about such a hook for a user logging in. If you used one of the session management frameworks you'd probably get some indication for that, but otherwise I do this kind of house keeping on my opening page itself which requires login. (What do you want to do about an already logged in user returning to your site a few days later... that is, do you really want to record logins or the start time of a visit/session??) If I wanted to do this but with multiple landing pages, and without using a session framework, I'd use memcache to do a quick check on every page request and then only write to the datastore when a new visit starts.

1

7

0

Every time a user logs in to the application, I want to perform a certain task, say, record the time of login. So I wanted to know if a hook is fired on login by default? If yes, how can I make my module respond to it. Edit - Assume there are multiple entry points in the application to login.

Login hook on Google Appengine

0

1

0

345

4,680,693

2011-01-13T13:44:00.000

0

1

python,security,apache,root,privileges

0

4,710,807

0

2

0

true

1

0

Hello You can easily create web applications in Python using WSGI-compliant web frameworks such as CherryPy2 and templating engines such as Genshi. You can use the 'subprocess' module to manadge external commands...

2

3

0

I received a project recently and I am wondering how to do something in a correct and secure manner. The situation is the following: There are classes to manage linux users, mysql users and databases and apache virtual hosts. They're used to automate the addition of users in a small shared-hosting environnement. These classes are then used in command-line scripts to offer a nice interface for the system administrator. I am now asked to build a simple web interface to offer a GUI to the administrator and then offer some features directly to the users (change their unix password and other daily procedures). I don't know how to implement the web application. It will run in Apache (with the apache user) but the classes need to access files and commands that are only usable by the root user to do the necessary changes (e.g useradd and virtual hosts configuration files). When using the command-line scripts, it is not a problem as they are run under the correct user. Giving permissions to the apache user would probably be dangerous. What would be the best technique to allow this through the web application ? I would like to use the classes directly if possible (it would be handier than calling the command line scripts like external processes and parsing output) but I can't see how to do this in a secure manner. I saw existing products doing similar things (webmin, eBox, ...) but I don't know how it works. PS: The classes I received are simple but really badly programmed and barely commented. They are actually in PHP but I'm planning to port them to python. Then I'd like to use the Django framework to build the web admin interface. Thanks and sorry if the question is not clear enough. EDIT: I read a little bit about webmin and saw that it uses its own mini web server (called miniserv.pl). It seems like a good solution. The user running this server should then have permissions to modify the files and use the commands. How could I do something similar with Django? Use the development server? Would it be better to use something like CherryPy?

Modify system configuration files and use system commands through web interface

0

1.2

1

0

474

4,680,693

2011-01-13T13:44:00.000

0

1

python,security,apache,root,privileges

0

4,684,335

0

2

0

false

1

0

You can use sudo to give the apache user root permission for only the commands/scripts you need for your web app.

2

3

0

I received a project recently and I am wondering how to do something in a correct and secure manner. The situation is the following: There are classes to manage linux users, mysql users and databases and apache virtual hosts. They're used to automate the addition of users in a small shared-hosting environnement. These classes are then used in command-line scripts to offer a nice interface for the system administrator. I am now asked to build a simple web interface to offer a GUI to the administrator and then offer some features directly to the users (change their unix password and other daily procedures). I don't know how to implement the web application. It will run in Apache (with the apache user) but the classes need to access files and commands that are only usable by the root user to do the necessary changes (e.g useradd and virtual hosts configuration files). When using the command-line scripts, it is not a problem as they are run under the correct user. Giving permissions to the apache user would probably be dangerous. What would be the best technique to allow this through the web application ? I would like to use the classes directly if possible (it would be handier than calling the command line scripts like external processes and parsing output) but I can't see how to do this in a secure manner. I saw existing products doing similar things (webmin, eBox, ...) but I don't know how it works. PS: The classes I received are simple but really badly programmed and barely commented. They are actually in PHP but I'm planning to port them to python. Then I'd like to use the Django framework to build the web admin interface. Thanks and sorry if the question is not clear enough. EDIT: I read a little bit about webmin and saw that it uses its own mini web server (called miniserv.pl). It seems like a good solution. The user running this server should then have permissions to modify the files and use the commands. How could I do something similar with Django? Use the development server? Would it be better to use something like CherryPy?

Modify system configuration files and use system commands through web interface

0

1

0

474

4,683,639

2011-01-13T18:17:00.000

2

0

1

0

python,ocaml

0

4,684,135

0

6

0

false

0

You can execute commands using Sys.command, so you can just do Sys.command "python foo.py", assuming python is in your path and foo.py is in the current directory.

2

3

0

I wanted to ask if you could call in a program written in Ocaml a program written in python , and if the answer is yes how do I do?

Call a program written in python in a program written in Ocaml

0

0.066568

1

0

849

4,683,639

2011-01-13T18:17:00.000

-1

0

1

0

python,ocaml

0

4,683,673

0

6

0

false

0

It depends on your exact requirements, but you can use pythons os.system() to execute an program in the same way you would call it from the command line. That should be a good starting point.

2

3

0

I wanted to ask if you could call in a program written in Ocaml a program written in python , and if the answer is yes how do I do?

Call a program written in python in a program written in Ocaml

0

-0.033321

1

0

849

4,690,890

2011-01-14T12:10:00.000

0

1

python,multithreading,network-programming,urllib2,mechanize

1

4,691,668

0

2

0

false

0

You could possibly be creating more threads than you expect - monitor the result of threading.active_count() to test this. If possible try to rule out the VPN at your end (or post the relevant guts of the code so we can test it). (Nettiquete) If you're not doing so already, only use network.http.max-connections-per-server threads per monitored site/host. (For reference) urlopen returns a file-like object - use .close() or del on this object or the socket will be sat in a CLOSE_WAIT state until a timeout. Hopefully these points are, well, pointers.

1

2

0

I'm writing a python script checking/monitoring several server/websites status(response time and similar stuff), it's a GUI program and I use separate thread to check different server/website, and the basic structure of each thread is using an infinite while loop to request that site every random time period(15 to 30 seconds), once there's changes in website/server each thread will start a new thread to do a thorough check(requesting more pages and similar stuff). The problem is, my internet connection always got blocked/jammed/messed up after several hours running of this script, the situation is, from my script side I got urlopen error timed out each time it's requesting a page, and from my FireFox browser side I cannot open any site. But the weird thing is, the moment I close my script my Internet connection got back on immediately which means now I can surf any site through my browser, so it must be the script causing all the problem. I've checked the program carefully and even use del to delete any connection once it's used, still get the same problem. I only use urllib2, urllib, mechanize to do network requests. Anybody knows why such thing happens? How do I debug this problem? Is there a tool or something to check my network status once such situation occurs? It's really bugging me for a while... By the way I'm behind a VPN, does it have something to do with this problem? Although I don't think so because my network always get back on once the script closed, and the VPN connection never drops(as it appears) during the whole process. [Updates:] Just found more info about this problem, when my program brings down the internet connection, well, it's not totally "down", I mean, I cannot open any site in my browser or always get urlopen error timed out, but I still can get reply using "ping google.com" in cmd line. And when I manually dropped the VPN connection then redial, without closing my program it starts to work again and also I can surf the net through my browser. Why this happening?

My python program always brings down my internet connection after several hours running, how do I debug and fix this problem?

0

1

0

1

643

4,694,706

2011-01-14T18:45:00.000

3

0

1

0

python,pygtk,twisted,amqp,deferred

0

4,695,170

0

1

0

true

0

On the server side, how do I defer the response inside one of the servers pb methods? Easy. Return the Deferred from the remote_ method. Done.

1

2

0

Background: I have a gtk client that uses twisted and perspective broker to perform remote object execution and server/client communication. This works great for me and was a breeze to start working with. I have amqp (Message Queue/MQ) services that I also need to communicate from the client. I have a security model in place around the client and server through twisted, and I don't want the clients to talk to the Message Queue Server directly, nor do I want another dependency on amqp libraries for the clients. Ideally I would like the client to send a request to the server through perspective broker, the Perspective Broker Server to send an amqp request to another server on behalf of the client, and the client to receive an acknowledgment when the PB server receives a response from the Message Queue Server. Question: On the server side, how do I defer the response inside one of the servers pb methods? More importantly what's the most efficient way to connect an outgoing request back to an incoming request and still preserve the Twisted event driven paradigms?

Python Twisted - Prospective Broker and Server-Side Deffereds

0

1.2

1

0

323

4,697,623

2011-01-15T01:55:00.000

3

0

1

python,multithreading,network-programming,urllib2,python-multithreading

1

4,697,664

0

1

0

true

1

0

Are you sure you are closing TCP sessions after each request? Try to check netstat information from time to time and if you'll see that the number of active/established sessions is rising it means that you have some problems in your script. Yes, usually you can ping even if you are out of free TCP sockets.

1

0

It's a GUI program I wrote in python checking website/server status running on my XP SP3, multi threads are used to check different site/server. After several hours running, the program starts to get urlopen error timed out all the time, and this always happens right after a POST request from a server(not a certain one, might be A or B or C), and it's also not the first POST request causing the problem, normally after several hours running and it happens to make a POST request at an unknown moment, all you get from then on is urlopen error timed out. I'm still able to ping but cannot browse any site, once the program closed everything's fine. It's definitely the program causing this problem, well I just don't know how to debug/check what the problem is, also don't know if it's from OS side or my program wasting too many resources/connections(are you still able to ping when too many connections used?), would anybody please help me out?

Able to ping but cannot browse after several hours running of my python program

0

1.2

1

0

1

204

4,707,192

2011-01-16T18:27:00.000

7

0

python,django,forms

0

11,547,550

0

5

0

false

1

0

NOTE: There are three questions here. For the first two questions, see the fuller answer by AndiDog. I'm only answering the third question here: Q. What widget method is responsible for going from the user's input back to the data model? A. The value_from_datadict method -- it's sort of the inverse of a widget's render method. This method is presumably what the Django docs on widgets are referring to when it says "The widget handles the rendering of the HTML, and the extraction of data from a GET/POST dictionary that corresponds to the widget." There's nothing further on this point in the docs, but you can see how it works from the code for the built-in widgets.

1

63

0

1

I am having a difficult time finding documentation on how to write a custom widget. My questions are: If I build a custom widget, can it be used equivalently for the admin interface or for normal forms? If I want to allow the user to edit a list of items, what widget should I subclass? What methods of the widget do I need to override/implement? What widget method is responsible for going from the user's input back to the data model? Thanks.

Django: How to build a custom form widget?

0

1

0

51,410

4,709,968

2011-01-17T04:07:00.000

3

0

1

python,c,unix

0

4,709,984

0

4

0

false

0

No portable API exists to do this in Unix. Most filesystems don't index files inside directories by their mtime (or ctime), so even if it did it probably wouldn't be any faster than doing it yourself.

1

4

0

I'm trying to find out the latest file in a huge filesystem. One way to do this is to go through all directories - one at a time, read its contents, select the latest file etc. The obvious drawback is I have to get all the files in a specific directory. I was wondering whether there was a 'magic' call in Python [1] which Unix supports to get just the latest file in a directory. [1]. My application is in Python, but if a readymade solution doesnt exist in stdlib, please provide C (lanuage) alternatives using system calls. I'm willing to write a C-extension and make this work. Thanks update: I suppose I should offer an explanation on why an inotify type solution wont work for me. I was simply looking for a system call using Python/C which could give me the latest file. Yes, one could have inotify (or a similar overarching setup) which monitors FS changes but given a random directory how do I find the latest file is the essence of the question.

Find the most recent file in a directory without reading all the contents of it

0

0.148885

1

0

1,636

4,718,588

2011-01-17T22:23:00.000

0

1

0

1

0

python,progress-bar,tar

0

4,718,870

0

5

0

false

0

How are you adding files to the tar file? Is is through "add" with recursive=True? You could build the list of files yourself and call "add" one-by-one, showing the progress as you go. If you're building from a stream/file then it looks like you could wrap that fileobj to see the read status and pass that into addfile. It does not look like you will need to modify tarfile.py at all.

1

4

0

Is there any library to show progress when adding files to a tar archive in python or alternativly would be be possible to extend the functionality of the tarfile module to do this? In an ideal world I would like to show the overall progress of the tar creation as well as an ETA as to when it will be complete. Any help on this would be really appreciated.

Python tarfile progress

0

1

0

3,242

4,719,836

2011-01-18T02:01:00.000

1

0

1

python,sql,django,sqlite

0

4,724,461

0

4

0

false

0

Use a parameterized query and Use a transaction.

2

6

0

I have a .sql file containing thousands of individual insert statements. It takes forever to do them all. I am trying to figure out a way to do this more efficiently. In python the sqlite3 library can't do things like ".read" or ".import" but executescript is too slow for that many inserts. I installed the sqlite3.exe shell in hopes of using ".read" or ".import" but I can't quite figure out how to use it. Running it through django in eclipse doesn't work because it expects the database to be at the root of my C drive which seems silly. Running it through the command line doesn't work because it can't find my database file (unless I'm doing something wrong) Any tips? Thanks!

Python and sqlite3 - adding thousands of rows

0

0.049958

1

0

1,859

4,719,836

2011-01-18T02:01:00.000

2

0

1

python,sql,django,sqlite

0

13,787,939

0

4

0

false

0

In addition to running the queries in bulk inside a single transaction, also try VACUUM and ANALYZEing the database file. It helped a similar problem of mine.

2

6

0

I have a .sql file containing thousands of individual insert statements. It takes forever to do them all. I am trying to figure out a way to do this more efficiently. In python the sqlite3 library can't do things like ".read" or ".import" but executescript is too slow for that many inserts. I installed the sqlite3.exe shell in hopes of using ".read" or ".import" but I can't quite figure out how to use it. Running it through django in eclipse doesn't work because it expects the database to be at the root of my C drive which seems silly. Running it through the command line doesn't work because it can't find my database file (unless I'm doing something wrong) Any tips? Thanks!

Python and sqlite3 - adding thousands of rows

0

0.099668

1

0

1,859

4,720,073

2011-01-18T02:52:00.000

1

0

1

0

python,loops,time,permutation,while-loop

0

4,720,112

0

3

0

false

0

There's a very hacky way to do this by using time.asctime(). You store the asctime before entering the while loop and somewhere in the loop itself. Calculate the time difference between the stored time and the current time and if that difference is 10 seconds, then update the stored time to the current time and print that it's been running. However, that's a very hacky way to do it as it requires some twisted and boring math. If your aim is to check the runtime of a specific algorithm, then you're better off using the timeit module Hope this Helps

1

7

0

i have a loop that runs for up to a few hours at a time. how could I have it tell me how long it has been at a set interval? just a generic...question EDIT: it's a while loop that runs permutations, so can i have it print the time running every 10 seconds?

python -> time a while loop has been running

0

0.066568

1

0

9,699

4,720,363

2011-01-18T04:00:00.000

0

1

0

python,time,brute-force,combinations

0

4,720,383

0

3

0

false

0

How long as in time? from time import time on top, at the start of the program do start = time(). at the nameerror part do print time() - start please be a bit more specific

1

0

i decided to write a brute force function to show people how vulnerable a password is. right now, i can show them the list it goes through to find the password, but how do i tell them how long it took? here's the code: #!/usr/bin/python import itertools lower_a = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'] upper_a = ['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'] num = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9'] alllet = [] alllet = lower_a + upper_a# + num pwd = raw_input("What pwd?\t\t") try: for r in range(1, len(pwd)+1): for s in itertools.product(alllet, repeat=r): print ''.join(s) if ''.join(s) == pwd: raise NameError() except KeyboardInterrupt: print "Hey! You stopped me!" except NameError: print "DONE! CRACKED!" print "\n\nPassword is:\t" + ''.join(s) + "\n\n"

python -> password safety program

0

1

0

521

4,731,352

2011-01-19T03:00:00.000

0

python,django,django-models,django-settings,django-fixtures

0

4,731,825

0

2

0

false

1

0

The easiest way is to use manage.py testserver [fixture ...] If this is a staging (rather than dev) deployment, though, you may not want to use django's builtin server. In that case, a quick (if hacky) way of doing what you're after is to have the fixtures in an app (called, for example, "undeployed") that is only installed in your non-production settings.

1

2

0

I have an initial_data fixture that I want to load everytime except for production. I already have different settings file for production and non-production deployments. Any suggestions on how to accomplish this? Clarification: I do not want test fixtures. Basically, I just need the fixture to be loaded based on a setting change of some sort. I'll be digging into the Django code to see if I could figure out an elegant way to accomplish this.

Have different initial_data fixtures for different stages (testing v. production)

0

1

0

490

4,737,814

2011-01-19T16:24:00.000

0

1

0

python,string

0

4,738,130

0

3

0

false

0

No 3: If your string is s: max((j-i,s[i:j]) for i in range(len(s)-1) for j in range(i+2,len(s)+1) if s[i:j]==s[j-1:i-1:-1])[1] will return the answer.

1

2

0

I'm new to Python and am currently reading a chapter on String manipulation in "Dive into Python." I was wondering what are some of the best (or most clever/creative) ways to do the following: 1) Extract from this string: "stackoverflow.com/questions/ask" the word 'questions.' I did string.split(/)[0]-- but that isn't very clever. 2) Find the longest palindrome in a given number or string 3) Starting with a given word (i.e. "cat")-- find all possible ways to get from that to another three- letter word ("dog"), changing one letter at a time such that each change in letters forms a new, valid word. For example-- cat, cot, dot, dog

Python: Clever ways at string manipulation

0

1

0

975

4,743,497

2011-01-20T04:40:00.000

0

1

0

1

python,coding-style,conventions

0

4,743,712

0

4

0

false

0

Python actually gives you the choice to package your code in the way you see fit. The analogy between Python and Java is that a file i.e., the .py file in Python is equivalent to a package in Java as in it can contain many related classes and functions. For good examples, have a look in the Python built-in modules. Just download the source and check them out, the rule of thumb I follow is when you have very tightly coupled classes or functions you keep them in a single file else you break them up.

3

30

0

In Java, this question is easy (if a little tedious) - every class requires its own file. So the number of .java files in a project is the number of classes (not counting anonymous/nested classes). In Python, though, I can define multiple classes in the same file, and I'm not quite sure how to find the point at which I split things up. It seems wrong to make a file for every class, but it also feels wrong just to leave everything in the same file by default. How do I know where to break a program up?

When should a Python script be split into multiple files/modules?

0

1

0

8,928

4,743,497

2011-01-20T04:40:00.000

3

0

1

0

1

python,coding-style,conventions

0

4,744,148

0

4

0

false

0

As I see it, this is really a question about reuse and abstraction. If you have a problem that you can solve in a very general way, so that the resulting code would be useful in many other programs, put it in its own module. For example: a while ago I wrote a (bad) mpd client. I wanted to make configuration file and option parsing easy, so I created a class that combined ConfigParser and optparse functionality in a way I thought was sensible. It needed a couple of support classes, so I put them all together in a module. I never use the client, but I've reused the configuration module in other projects. EDIT: Also, a more cynical answer just occurred to me: if you can only solve a problem in a really ugly way, hide the ugliness in a module. :)

3

30

0

In Java, this question is easy (if a little tedious) - every class requires its own file. So the number of .java files in a project is the number of classes (not counting anonymous/nested classes). In Python, though, I can define multiple classes in the same file, and I'm not quite sure how to find the point at which I split things up. It seems wrong to make a file for every class, but it also feels wrong just to leave everything in the same file by default. How do I know where to break a program up?

When should a Python script be split into multiple files/modules?

0

0.148885

1

0

8,928

4,743,497

2011-01-20T04:40:00.000

2

0

1

0

1

python,coding-style,conventions

0

4,743,655

0

4

0

false

0

In Java ... every class requires its own file. On the flipside, sometimes a Java file, also, will include enums or subclasses or interfaces, within the main class because they are "closely related." not counting anonymous/nested classes Anonymous classes shouldn't be counted, but I think tasteful use of nested classes is a choice much like the one you're asking about Python. (Occasionally a Java file will have two classes, not nested, which is allowed, but yuck don't do it.)

3

30

0

In Java, this question is easy (if a little tedious) - every class requires its own file. So the number of .java files in a project is the number of classes (not counting anonymous/nested classes). In Python, though, I can define multiple classes in the same file, and I'm not quite sure how to find the point at which I split things up. It seems wrong to make a file for every class, but it also feels wrong just to leave everything in the same file by default. How do I know where to break a program up?

When should a Python script be split into multiple files/modules?

0

0.099668

1

0

8,928

4,752,451

2011-01-20T20:52:00.000

1

0

python,string,content-type

0

4,752,526

0

4

0

false

0

If the file is downloaded from a webserver, you should have a content-type to look at, however you are at the mercy of the webserver whether or not it truly describes the type of the file. Another alternative would be to use a heuristic to guess the file type. This can often be done by looking at the first few bytes of the file

2

0

I receive some data as a string. I need to write the data to a file, but the problem is that sometimes the data is compressed/zipped and sometimes it's just plain text. I need to determine the content-type so I know whether to write it to a .txt file or a .tgz file. Any ideas on how to accomplish this? Can I use mime type somehow even though my data is a string, not a file? Thanks.

How to determine content type of a string

0

0.049958

1

0

2,383

4,752,451

2011-01-20T20:52:00.000

1

0

python,string,content-type

0

4,752,565

0

4

0

true

0

Both gzip and zip use distinct headers before compressed data, rather unlikely for human-readable strings. If the choice is only between these, you can make a faster check than mimetypes would provide.

2

0

I receive some data as a string. I need to write the data to a file, but the problem is that sometimes the data is compressed/zipped and sometimes it's just plain text. I need to determine the content-type so I know whether to write it to a .txt file or a .tgz file. Any ideas on how to accomplish this? Can I use mime type somehow even though my data is a string, not a file? Thanks.

How to determine content type of a string

0

1.2

1

0

2,383

4,758,855

2011-01-21T12:36:00.000

3

0

1

0

python,path,working-directory

0

4,758,914

0

3

0

false

0

You'd typically use os.listdir('.') for this purpose. If you need a standard module, the variable os.curdir is available.

1

0

I want to use the function os.listdir(path) to get a list of files from the directory I'm running the script in, but how do I say the current directory in the "path" argument?

How do I refer to the current directory in functions from the Python 'os' module?

0

0.197375

1

0

6,837

4,763,965

2011-01-21T21:27:00.000

3

0

1

0

python,scope

0

4,764,004

0

6

0

true

0

This is not how nonlocal works. It doesn't provide dynamic scoping (which is just a huge PITA waiting to happen and even more rarely useful than your average "evil" feature). It just fixes up lexical scoping. Anyway, you can't do what you have in mind (and I would say that this is a good thing). There's not even a dirty but easy hack (and while we're at it: such hacks are not discouraged because they generally perform a bit worse!). Just forget about it and solve the real problem properly (you didn't name it, so we can't say anything on this). The closest you could get is defining some object that carries everything you want to share and pass that around explicitly (e.g. make a class and use self, as suggested in another answer). But that's relatively cumbersome to do everywhere, and still hackery (albeit better than dynamic scoping, because "explicit is better than implicit").

1

8

0

Say, I have some scope with variables, and a function called in this scope wants to change some immutable variables: def outer(): s = 'qwerty' n = 123 modify() def modify(): s = 'abcd' n = 456 Is it possible somehow to access the outer scope? Something like nonlocal variables from Py3k. Sure I can do s,n = modify(s,n) in this case, but what if I need some generic 'injection' which executes there and must be able to reassign to arbitrary variables? I have performance in mind, so, if possible, eval & stack frame inspection is not welcome :) UPD: It's impossible. Period. However, there are some options how to access variables in the outer scope: Use globals. By the way, func.__globals__ is a mutable dictionary ;) Store variables in a dict/class-instance/any other mutable container Give variables as arguments & get them back as a tuple: a,b,c = innerfunc(a,b,c) Inject other function's bytecode. This is possible with byteplay python module.

Accessing the outer scope in Python 2.6

1

1.2

1

0

11,146

4,777,262

2011-01-23T23:25:00.000

1

0

1

0

python,django,installation

0

4,777,646

0

3

0

false

1

0

Get him to set up a virtual machine on his Mac, using VMWare Fusion or Parallels, running the same operating system that you currently use for your back end. If he prefers developing using Mac tools he can do still that by sharing his local changes to the virtual machine via a shared directory.

2

1

0

Hey everyone, I am expanding my team and I have recently added an additional front end engineer on my site. I am currently using django to run my site but my site is using a lot of plugins, namely: django-celery, django-mailer, django-notification, and django-socialregistration. Let me describe my situation: He is using Mac OS X, and I have no experience in installing stuff on mac os X or configuration on that platform I believe that getting my backend to run on his computer might be somewhat troublesome, i.e. I have to install a bunch of plugins (which are not available on pip or easy_install as they are the latest version) and I have also made heavy modification to django-socialregistration which I am currently using by symlinking to the modified code in my repos in my python path I tried to look into solutions like pip and easy_install but I have not been able to get them to install code from github I think the easiest way is to get my backend working on his computer and then he just commiting to the repos. Any ideas how I can make this easy?

Easiest way to share work between backend and front end

0

0.066568

1

0

181

4,777,262

2011-01-23T23:25:00.000

0

1

0

python,django,installation

0

4,777,381

0

3

0

false

1

0

An alternative, if that's possible, would be to set up a testing/development environment on a machine with an OS you're familiar with, then install something like Dropbox on his local machine where he can develop the frontend code, and install Dropbox on that other environment with the backend components. Dropbox would sync his local changes to that testing environment for him to run the code on. That way, he would be able to use that environment to test his code, you wouldn't need to set up a backend on his machine (or keep it up to date) and you'd still be getting the same functionality. Again, if that's an option.

2

1

0

Hey everyone, I am expanding my team and I have recently added an additional front end engineer on my site. I am currently using django to run my site but my site is using a lot of plugins, namely: django-celery, django-mailer, django-notification, and django-socialregistration. Let me describe my situation: He is using Mac OS X, and I have no experience in installing stuff on mac os X or configuration on that platform I believe that getting my backend to run on his computer might be somewhat troublesome, i.e. I have to install a bunch of plugins (which are not available on pip or easy_install as they are the latest version) and I have also made heavy modification to django-socialregistration which I am currently using by symlinking to the modified code in my repos in my python path I tried to look into solutions like pip and easy_install but I have not been able to get them to install code from github I think the easiest way is to get my backend working on his computer and then he just commiting to the repos. Any ideas how I can make this easy?

Easiest way to share work between backend and front end

0

1

0

181

4,789,021

2011-01-25T01:09:00.000

0

python,django,django-authentication

0

50,211,377

0

13

0

false

1

0

User.objects.filter(username='tom', groups__name='admin').exists() That query will inform you user : "tom" whether belong to group "admin " or not

2

179

0

I created a custom group in Django's admin site. In my code, I want to check if a user is in this group. How do I do that?

In Django, how do I check if a user is in a certain group?

0

1

0

149,841

4,789,021

2011-01-25T01:09:00.000

11

0

python,django,django-authentication

0

32,197,405

0

13

0

false

1

0

If a user belongs to a certain group or not, can be checked in django templates using: {% if group in request.user.groups.all %} "some action" {% endif %}

2

179

0

I created a custom group in Django's admin site. In my code, I want to check if a user is in this group. How do I do that?

In Django, how do I check if a user is in a certain group?

0

1

0

149,841

4,791,815

2011-01-25T09:35:00.000

5

0

1

0

python,multithreading,ubuntu-9.10

0

4,794,288

0

1

0

false

0

Short answer: Just make the def run() end. So, if you are waiting for data from a socket, do it with timeout, then if timeout occur just break the while that you should have, and the thread will be killed. You can check from main thread if a thread is alive with isAlive() method.

1

7

0

I'm writing a multi threaded Python app that makes many TCP connections to servers. Each connection is done on a separate thread. Sometimes the thread hangs for a long time which I don't want. How can I get the thread to kill itself after some given time period? From the main thread how can I determine that the child thread killed itself? If possible I would appreciate a snippet of code showing how to do this. Thanks. Update The system is Ubuntu 9:10

Python: how can I get a thread to kill itself after a timeout?

0

0.761594

1

0

8,125

4,793,250

2011-01-25T12:03:00.000

-2

0

1

0

1

python,pyqt4,xmpppy

1

50,261,727

0

2

0

false

0

1

when a python script .py has any error it shows in console but when you run python .exe file it genrates .exe.log file when error accured.so go to your folder and see that there is a .exe.log file is there showing errors.

1

0

I have made an application using Python and recently i found that i can use py2exe to make executables for windows. The problem is that a library i am using (xmpppy) produces this error DeprecationWarning: the md5 module is deprecated; use hashlib instead and when i try to run the executable a dialog appears saying this See the logfile 'C:\Python26\P2E\MyApp\dist\MyApp.exe.log' for details any ideas how to fix that?

PyQt4 - "See the log file for details" error

1

-0.197375

1

0

974

4,800,858

2011-01-26T02:16:00.000

4

0

1

0

python,data-structures

0

4,800,884

0

3

0

false

0

If you have uniform types of numbers & if speed is your primary goal (and you want to use python), use a Numpy array.

1

4

0

If I have a list with say 10 million objects, how do I filter the list quickly. It takes about 4-5 seconds for a complete iteration thru a list comprehension. Are there any efficient data structures or libraries for this in python? Or is python not suited for large sets of data?

Filtering / iterating through very large lists in python

0

0.26052

1

0

6,918

4,801,216

2011-01-26T03:40:00.000

2

0

iphone,python,cocoa,restful-authentication,web2py

0

4,809,129

0

2

0

true

1

0

I think you should post it to web2py group on google groups. [email protected]

1

2

0

I want to configure a simple webapplication to support an iphone app to connect with it in RESTFUL ways. Initially have a user login session enabled from the iphone to the web app. I'd like the iphone app to send a NSURL call to the webapp, with user and password and have the webapp respond if the suer exists or not. Pretty simple. And I want to do it with web2py. Is this possible? Any clues?

can web2py support RESTful api calls? if so any pointers on how to build one?I

1

1.2

1

0

990

4,802,134

2011-01-26T07:10:00.000

0

wxpython,textctrl

0

4,807,514

0

1

0

false

0

1

If all you're doing is showing one file, then all you need is one TextCtrl. I would give the widget the wx.TE_MULTILINE style and add it to a sizer with an EXPAND flag: sizer.Add(myTxtCtrl, 0, wx.EXPAND) Then the user can see the file and you can save the data with a Save button or menu item. The handler for that would basically just grab the text control's contents using it's GetValue() method.

1

0

I am trying to build my first wx application I have a browse button in my panel, the user adds his file. i do some processing on the file. Now i want to show the information in a TextCtrl so that the user may modify it. Then i need to write it in a file. But I dont know how many TextCtrl box is needed before processing the file. Using the browse button event i have got the file, extracted the information also. But i dont know how to show the information back to the user. any suggestion is appreciated.

wxPython: TextCtrl problem

0

1

0

439

4,806,911

2011-01-26T16:17:00.000

8

0

1

0

python,string,comparison

0

4,809,303

0

8

0

false

0

Python and just about every other computer language use the same principles as (I hope) you would use when finding a word in a printed dictionary: (1) Depending on the human language involved, you have a notion of character ordering: 'a' < 'b' < 'c' etc (2) First character has more weight than second character: 'az' < 'za' (whether the language is written left-to-right or right-to-left or boustrophedon is quite irrelevant) (3) If you run out of characters to test, the shorter string is less than the longer string: 'foo' < 'food' Typically, in a computer language the "notion of character ordering" is rather primitive: each character has a human-language-independent number ord(character) and characters are compared and sorted using that number. Often that ordering is not appropriate to the human language of the user, and then you need to get into "collating", a fun topic.

2

82

0

I'm wondering how Python does string comparison, more specifically how it determines the outcome when a less than < or greater than > operator is used. For instance if I put print('abc' < 'bac') I get True. I understand that it compares corresponding characters in the string, however its unclear as to why there is more, for lack of a better term, "weight" placed on the fact that a is less thanb (first position) in first string rather than the fact that a is less than b in the second string (second position).

How are strings compared?

0

1

0

132,841

4,806,911

2011-01-26T16:17:00.000

0

1

0

python,string,comparison

0

69,465,704

0

8

0

false

0

The comparison uses lexicographical ordering For Python 3: Convert it into Unicode to get its order or number that is being used as "weightage" here For Python 2: Use ASCII to get its order or number that is being used as "weightage" here People already answered it in detail, I am leaving it here for anyone who is in a hurry :)

2

82

0

I'm wondering how Python does string comparison, more specifically how it determines the outcome when a less than < or greater than > operator is used. For instance if I put print('abc' < 'bac') I get True. I understand that it compares corresponding characters in the string, however its unclear as to why there is more, for lack of a better term, "weight" placed on the fact that a is less thanb (first position) in first string rather than the fact that a is less than b in the second string (second position).

How are strings compared?

0

1

0

132,841

4,807,957

2011-01-26T17:46:00.000

4

0

1

0

python,google-app-engine,expando

0

4,812,503

0

1

0

true

1

0

All properties are automatically indexed for simple queries. Simple queries, in this case, are those that either: Use only equality filters, with no sort orders or inequality filters. Have an inequality filter or sort order on a single field, with no other filters. If you want to do more complex queries - such as ones that mix inequality and equality filters, only then do you need to build a custom index. It's not possible to build custom indexes at runtime. If you want to use expandos, you need to make sure that you restrict the queries you execute to those that are satisfiable under one of the situations above.

1

3

0

The google app engine python sdk offers an Expando type object which can be used for adding dynamic properties to an object that can be persisted to the datastore. The app engine also requires that for any property on which the objects need to be searched or sorted, an index must be created before uploading the app to google's servers. This is really strange because it means that i am supposed to know before hand what properties my users will create on my objects. If i knew that in advance, why would i not define them as static properties in my existing model? Does anyone know how to automatically create indexes for dynamic properties of Expando models after uploading to the app engine? If not, can anyone tell me why does the gae tout Expando as dynamic construct when it can not let you create new properties that can be searched on or sorted by, only properties that arent searchable or sortable.

Automatic indexes for expando properties in the google app engine for python

1

1.2

1

0

663

4,818,342

2011-01-27T15:33:00.000

2

0

1

0

python,pdf,ms-word

0

4,819,159

0

3

0

false

0

Install a PDF printer driver like CutePDF. Use COM automation to run MS Word; open the file, fill in the data, print the file as a PDF. Alternatively: convert the Word file into a PDF form; use ReportLab to fill in the form. Alternatively: print the Word file to a PDF file; use ReportLab to overlay text on the file.

1

4

0

I need to fill in a document and then try and convert it into a PDF. Any idea how I can do this?

Convert Word doc to PDF - Python

0

0.132549

1

0

13,293

4,822,860

2011-01-27T22:48:00.000

-1

0

python,proxy,urllib2

0

4,823,009

0

1

0

true

0

ProxyHandler can use a different proxy for different protocols (HTTP, etc.) but I don't think it will help you. You should be able to write your own class for your needs without much difficulty.

1

0

Hello I'm have a task - create script, what will walk in internet and change proxy from list. I'm see in module urllib2: ProxyHandler and HTTPPasswordMgr, but manual is poor. 1. In documentation ProxyHandler get dict with many proxy-server, how to I'm can select from list and use for url_open? 2. HTTPPasswordMgr have method add_password, but for what it? How to it will select auth-data for proxy, for what it have: realm? 3. How to right use multiple proxy in urllib2? I'm think only create a list with all my proxy and create new 'opener' for each request. Thanks

How to use multiple proxy in urllib2?

0

1.2

1

0

1

1,084

4,826,686

2011-01-28T09:36:00.000

1

0

python,bash,shell

0

4,826,733

0

3

0

false

0

You can use os.system or subprocess.Popen or subprocess.call but when using subprocess methods make sure you use shell=True. And executing it via system call in all these methods is blocking. The python script will complete and then go the next step.

1

5

0

Will it continue the code after it's run? Or will it stop at that line until the script is done?

Inside python code, how do I run a .sh script?

0

0.066568

1

0

32,061

4,826,896

2011-01-28T09:59:00.000

1

0

c++,python,optimization,interaction

0

4,827,083

0

5

0

false

0

1

Firstly, just to be pedantic, there are no C++ scripts in normal use. C++ compiles, ultimately, to machine code, and the C++ program is properly referred to as a "program" and not a "script". But to answer your question, you could indeed set up the C++ program to stay in memory, where it listens for connections and sends responses to your Python script. You'd want to study Unix IPC, particularly sockets. Another way to approach it would be to incorporate what the C++ program does into your Python script, and forget about C++ altogether.

1

0

I am trying to optimize the interaction between two scripts I have. Two things I thought of are the c++ program not terminating unless you manually kill it, or generating all info in python before feeding it to c++. Explanation of the problem: What the scripts do: C++ program (not made by me, and I can't program in c++ very well): takes a 7 number array and returns a single number, simple. Python script (mine, and I can program a bit in python): generates those 7 number arrays, feeds them to the c++ program, waits for an answer and adds it to a list. It then makes the next array. In theory, this works. However, as it is right now, it opens and closes the c++ program for each call. For one array that is no problem, but I'm trying to upscale to 25k arrays, and in the future to 6+ million arrays. Obviously it is then no longer feasible to open/close it each time, especially since the c++ program first has to load a 130mb VCD file to function. Two options I thought of myself were to generate all arrays first in python, then feed them to the c++ program and then analyze all results. However, I wouldn't know how to do this with 6M arrays. It is not important however that the results I get back are in the same order as the arrays I feed in. Second option I thought of was to make the c++ program not quit after each call. I can't program in c++ though so I don't know if this is possible, keeping it 'alive' so you can just feed arrays into it at times and get an answer. (Note: I cannot program in anything else than python, and want to do this project in python. The c++ program cannot be translated to python for speed reasons.) Thanks in advance, Max.

Python and C++ script interaction

0

0.039979

1

0

2,200

4,834,533

2011-01-29T01:33:00.000

1

0

1

0

python,module,egg

0

6,228,872

0

1

false

0

Note that you have 2 different site-packages locations; one is /usr/lib/python2.5/site-packages and the other is /usr/local/FOLDER/lib/python2.5/site-packages. The egg in the latter location is being preferred over the egg in the first location when the latter location comes first in your PYTHON_PATH. In iPython, you can check the python path by printing import sys; sys.path; install the new egg in the second location to have iPython use it, or remove the old egg from that location altogether. If you do this manually, don't forget to update the .pth file in the affected site-packages directory.

1

0

I've updated a Python egg that is only being used locally. The update proceeded correctly and installed into /usr/lib/python2.5/site-packages/eggName-UpdatedVersionNumber-py2.5.egg However, when I open iPython and try to import the egg, I still get the old version. Running egg_name.__file__ gives me: /usr/local/FOLDER/lib/python2.5/site-packages/eggName-OldVersionNumber-py2.5.egg/egg/__init__.pyc Running easy_install --upgrade EGG shows: ... EGG UpdatedVersionNumber is already the active version in easy-install.pth\ Any idea on how to get the system to call the new version installed at /usr/lib/python2.5/site-packages/...?

How to get iPython to use Updated Egg/Module

0

0.197375

1

0

593

4,836,450

2011-01-29T10:49:00.000

1

0

1

python

1

4,851,152

0

1

0

false

0

Hi I dnt know y the error occurs but when i directed the print statements from my script to another file this error did not come and my script ran successfully Example: Myscript.py > test.log

1

2

0

I am running a Python script which downloads PDF files from the FTP. The script when run manually works perfectly but when i put it in crontab in my ubuntu machine and execute it i get a an error [Errno 32] Broken pipe. Any idea why this happens and how do i handle this?

[Errno 32]Broken pipe in Python Script in Crontab

0

0.197375

1

0

1,316

4,838,504

2011-01-29T18:04:00.000

7

0

1

0

python,list

0

4,838,530

0

6

0

false

0

The items[:100] other mentioned gives you a new list which contains the first 100 items of items. If you want to modify the list in-place, either use items[:] = items[:100] (slice assignment) or while len(items) > 100: items.pop()use del items[100:] as proposed by Ned Batchelder.

1

47

0

If I have a list and want to truncate it so it is no more than 100 items, how do I do this?

How do I truncate a list?

0

1

0

58,602

4,840,182

2011-01-29T23:41:00.000

15

0

1

0

python

0

9,478,011

0

4

0

false

0

If you're willing to build and install the entire python package, this is how I would go about it: Edit the setup() function in setup.py to contain a parameter named scripts and set its argument as the location of the file(s) you wish to run from anywhere. e.g. setup(name='myproject',author='',author_email='',scripts=['bin/myscript.py']) Within the directory that contains setup.py, create a bin directory by typing mkdir bin Add myscript.py to this newly-created bin directory (and make sure it's executable!) cd into the directory that contains setup.py again, and install the entire python package by typing python setup.py install Once the package is installed, you should be able to run myscript.py from anywhere on the system!

1

81

0

I can't figure out how to make setup.py add a scrip to the the user's /bin or /usr/bin or whatever. E.g., I'd like to add a myscript.py to /usr/bin so that the user can call myscript.py from any directory.

setup.py and adding file to /bin/

0

1

0

48,656

4,841,732

2011-01-30T07:33:00.000

3

0

1

0

1

python,python-2.x

0

4,842,269

0

5

0

false

0

There is no quantity 1/2 anywhere. Python does not represent rational numbers with a built-in type - just integers and floating-point numbers. 1 is divided by 2 - following the integer division rules - resulting in 0. float(0) is 0.

1

14

0

I want to convert 1/2 in python so that when i say print x (where x = 1/2) it returns 0.5 I am looking for the most basic way of doing this, without using any split functions, loops or maps I have tried float(1/2) but I get 0... can someone explain me why and how to fix it? Is it possible to do this without modifying the variable x= 1/2 ?

Convert fraction to decimal in Python

1

0.119427

1

0

52,481

4,854,486

2011-01-31T18:18:00.000

2

0

user-interface,redirect,event-handling,wxpython,stdin

0

4,854,744

0

1

true

0

1

When you type, the input comes from the GUI event mechanism, not from stdin. You asked how to get the "keyboard stdin", and the answer to that is the same as for any other type of program: you read it (but it will almost certainly be empty). It's important to realize that the GUI probably doesn't have a stdin if it was started by double-clicking on an icon on the desktop. And no, you can't "redirect keyboard inputs to [your] child process", if I understand your question. Stdin really has absolutely nothing to do with GUIs at all. How keyboard input is read via a GUI is completely disconnected from stdin.

1

0

I am quite confused about the stdin and the key_events of GUI widget. Usually in my mind, I thought stdin is the ordinary way to get the keyboard input for a process. E.g., If I have a process, then I could use stdin to have the keyboard inputs. And this is usually used to make I/O direction for the subprocess to get keyboard inputs. E.g., I could make subprocess.Popen(stdin=PIPE) On the other hand for GUI, I am using wx.TexCtrl or py.Shell.shell, to catch the key events, like inputs. So I am quite confused here, if I have a GUI or pyShell running, when I am typing via the keyboard, is it via the stdin or via the GUI key event catching system? If via the GUI key events system, how can I get the keyboard stdin? Can I still simply redirect the keyboard inputs to my child process (inside the GUI) as the ordinary non-GUI programming? Thanks a lot for any comments.

key_events of GUI widget and stdin

0

1.2

1

0

405

4,862,346

2011-02-01T12:08:00.000

1

0

1

0

python,shell,latex

0

4,862,410

0

7

0

false

0

Not much of a python man myself. But in a pinch, assuming you're on linux, you could periodically shell out and "ls -lrt /path/to/directory" (get the directory contents and sort by last modified), and compare the results of the last two calls for a difference. If so, then there was a change. Not very detailed, but gets the job done.

1

6

0

I have a program that create files in a specific directory. When those files are ready, I run Latex to produce a .pdf file. So, my question is, how can I use this directory change as a trigger to call Latex, using a shell script or a python script? Best Regards

Check if the directory content has changed with shell script or python

0

0.028564

1

0

4,757

4,869,315

2011-02-01T23:46:00.000

3

0

1

0

python,bash,osx-snow-leopard,twisted,.bash-profile

0

4,869,690

0

4

0

true

0

You'll need to install Twisted into your Python 2.7 installation somehow. The "2.6" in that path should be a hint that you shouldn't be trying to tell Python 2.7 about it. Among other things: Extension modules are not compatible between python versions. You may get a segfault if you try to use them. Bytecode formats are not compatible between python versions. Python will fall back to parsing '.py' files, which is slower. If you're using an operating system that ships with Python 2.6, there is a good chance that the version of Twisted included is not compatible with Python 2.7, since Python 2.7 may not have been out yet when it was released.

3

1

0

I have a new MacBook Pro running OS X 10.6.6 / Snow Leopard -- which ships with Python 2.6, although I have installed 2.7.1 Unfortunately, this doesn't seem to see the Twisted install in the 2.6/Extras/lib/python/twisted directory, as I find I'm unable to import modules that I can see are present in that directory. "which python" returns "/Library/Frameworks/Python.framework/Versions/2.7/bin/python" and running python returns the same: "Python 2.7.1 (r271:86882M, Nov 30 2010, 10:35:34)" I have added the twisted directory (absolute) to sys.path, and I have added it to .bash_profile, which now consists of the following: PATH="/Library/Frameworks/Python.framework/Versions/2.7/bin:${PATH}" PATH=$PATH:/System/Library/Frameworks/Python.framework/Versions/2.6/Extras/lib/python/twisted export PATH Any ideas how I can get 2.7.1 to see the Twisted install? Or am I trying to do something that just can't be done? thanks.

Python 2.7.1 can't see Twisted

0

1.2

1

0

2,965

4,869,315

2011-02-01T23:46:00.000

2

0

1

0

python,bash,osx-snow-leopard,twisted,.bash-profile

0

4,869,359

0

4

0

false

0

Create an environment using virtualenv. Install Twisted in your newly created environment using pip.

3

1

0

I have a new MacBook Pro running OS X 10.6.6 / Snow Leopard -- which ships with Python 2.6, although I have installed 2.7.1 Unfortunately, this doesn't seem to see the Twisted install in the 2.6/Extras/lib/python/twisted directory, as I find I'm unable to import modules that I can see are present in that directory. "which python" returns "/Library/Frameworks/Python.framework/Versions/2.7/bin/python" and running python returns the same: "Python 2.7.1 (r271:86882M, Nov 30 2010, 10:35:34)" I have added the twisted directory (absolute) to sys.path, and I have added it to .bash_profile, which now consists of the following: PATH="/Library/Frameworks/Python.framework/Versions/2.7/bin:${PATH}" PATH=$PATH:/System/Library/Frameworks/Python.framework/Versions/2.6/Extras/lib/python/twisted export PATH Any ideas how I can get 2.7.1 to see the Twisted install? Or am I trying to do something that just can't be done? thanks.

Python 2.7.1 can't see Twisted

0

0.099668

1

0

2,965

4,869,315

2011-02-01T23:46:00.000

3

0

1

0

python,bash,osx-snow-leopard,twisted,.bash-profile

0

4,869,332

0

4

0

false

0

You'll have to install twisted using python 2.7. Also, python doesn't look up what's in the PATH variable for imports, it looks in PYTHONPATH. But just putting your python 2.6 folder in your pythonpath isn't a very good solution.

3

1

0

I have a new MacBook Pro running OS X 10.6.6 / Snow Leopard -- which ships with Python 2.6, although I have installed 2.7.1 Unfortunately, this doesn't seem to see the Twisted install in the 2.6/Extras/lib/python/twisted directory, as I find I'm unable to import modules that I can see are present in that directory. "which python" returns "/Library/Frameworks/Python.framework/Versions/2.7/bin/python" and running python returns the same: "Python 2.7.1 (r271:86882M, Nov 30 2010, 10:35:34)" I have added the twisted directory (absolute) to sys.path, and I have added it to .bash_profile, which now consists of the following: PATH="/Library/Frameworks/Python.framework/Versions/2.7/bin:${PATH}" PATH=$PATH:/System/Library/Frameworks/Python.framework/Versions/2.6/Extras/lib/python/twisted export PATH Any ideas how I can get 2.7.1 to see the Twisted install? Or am I trying to do something that just can't be done? thanks.

Python 2.7.1 can't see Twisted

0

0.148885

1

0

2,965

4,876,799

2011-02-02T16:08:00.000

0

python,web-scraping,scrapy

0

4,889,635

0

2

0

false

1

0

Why don't you want to add all the links to 50 pages? Are the URLs of the pages consecutive like www.site.com/page=1, www.site.com/page=2 or are they all distinct? Can you show me the code that you have now?

2

1

0

I have recently started to work with Scrapy. I am trying to gather some info from a large list which is divided into several pages(about 50). I can easily extract what I want from the first page including the first page in the start_urls list. However I don't want to add all the links to these 50 pages to this list. I need a more dynamic way. Does anyone know how I can iteratively scrape web pages? Does anyone have any examples of this? Thanks!

Recursive use of Scrapy to scrape webpages from a website

1

0

1

0

1

1,171

4,876,799

2011-02-02T16:08:00.000

1

0

python,web-scraping,scrapy

0

4,940,212

0

2

0

false

1

0

use urllib2 to download a page. Then use either re (regular expressions) or BeautifulSoup (an HTML parser) to find the link to the next page you need. Download that with urllib2. Rinse and repeat. Scapy is great, but you dont need it to do what you're trying to do

2

1

0

I have recently started to work with Scrapy. I am trying to gather some info from a large list which is divided into several pages(about 50). I can easily extract what I want from the first page including the first page in the start_urls list. However I don't want to add all the links to these 50 pages to this list. I need a more dynamic way. Does anyone know how I can iteratively scrape web pages? Does anyone have any examples of this? Thanks!

Recursive use of Scrapy to scrape webpages from a website

1

0.099668

1

0

1

1,171

4,877,959

2011-02-02T17:53:00.000

2

0

1

0

python,linux,pyqt4

0

4,878,854

0

1

0

false

0

1

PyQt4 and Qt are cross-platform. If you write cross-platform code, you don't need to develop on any specific OS. Testing on different platforms from time to time is a good idea, but good cross-platform code will usually just work. Don't use any Windows-specific features, Windows-specific code. In particular, don't use subprocess unless calling shell commands is part of your app, use os.path instead of writing paths yourself, don't hardcode any paths, verify that each library that you're using is cross-platform, and you'd be fine. And when you're testing on Linux, test on actual Linux. Cygwin is another, different platform. You can try using a virtual machine with VirtualBox. P.S. You might also look at Nokia's new PySide which has more liberal license than PyQt4 and supports most of what PyQt4 supports with nearly the same interface. It's a bit young, but by the time you complete your application, it would probably be more common.

1

0

I am trying to use PyQt4. I have downloaded its LINUX version and trying to install it with Cygwin(because I have windows on my PC and I want to use linux, therefore I am using Cygwin). I don't know how to install it ? please guide me . There is no such file like setup.py, install....what should I do??

pyqt4 on Linux environment

0

0.379949

1

0

526

4,880,818

2011-02-02T22:45:00.000

0

1

0

python,rpm,rhel5

0

4,935,001

0

3

0

false

0

If you are on RHEL then you could seriously consider using the yum APIs instead of rpm-python directly ... the API is much easier to use.

1

0

1

Trying to learn how to use the rpm-python module (i.e. "import rpm" on RHEL5). I can't find any tutorials that are complete or recent. Specifically regarding how to install and manage rpm's on a system. Anyone?

Where is the most authoritative/complete source of documentation on rpm-python module?

0

1

0

658

4,883,541

2011-02-03T07:41:00.000

1

0

1

python

0

4,883,551

0

2

0

false

0

you have to start the process as root. You can run "sudo yourscript.py" as your normal user account or log in as root or run "su -" to become root and then run your script. Your script cannot obtain root privileges after it starts running. That's just not how unix/linux systems work.

1

0

hi everybody i wanna take a dir from one directory and os doesn't allow me to do this work(for example /etc/openvpn in linux) and i know i should be root but i don't know how can i do this with python.

access denied in python

0

0.099668

1

0

757

4,898,066

2011-02-04T12:39:00.000

0

python,http,xmlhttprequest

0

4,898,364

0

3

0

false

1

0

There's absolutely no need to write your own web server. Plenty of options exist, including lightweight ones like nginx. You should use one of those, and either your own custom WSGI code to receive the request, or (better) one of the microframeworks like Flask or Bottle.

1

0

I am currently working on a project to create simple file uploader site that will update the user of the progress of an upload. I've been attempting this in pure python (with CGI) on the server side but to get the progress of the file I obviously need send requests to the server continually. I was looking to use AJAX to do this but I was wondering how hard it would be to, instead of changing to some other framerwork (web.py for instance), just write my own web server for receiving the XML HTTP Requests? My main problem is that sending the request is done from HTML and Javascript so it all seems like magic trickery at the moment. Can anyone advise me as to the best way to go about receiving these requests on the server? EDIT: It seems that a framework would be the way to go. Would web.py be a good route to take?

Creating a python web server to recieve XML HTTP Requests

0

1

0

1

1,735

4,909,306

2011-02-05T19:57:00.000

2

1

0

java,python,templates,web-frameworks

0

4,909,342

0

4

0

false

1

0

It may sound strange, but there's no need to know "how web development is performed in Python" to start doing it. In fact, working with language/framework/etc is a single most reliable way to get understanding of it. You won't gain a lot from one-page summaries. Also, comparing it with Java isn't likely to help. There's no point in doing "Java-style development in Python". If you want to benefit, you'll need to clear your mind and do everything "Python-way". As to what Python framework to choose, Django seems like like a good starting point. It's very popular, which means you won't be left without tutorials/documentation/help. PS Short version: just do it.

2

6

0

I am thinking in starting a personal pet web project to experiment with different things and extend my knowledge. I use Java a lot at work (for web applications :D) and was thinking in making my own in Python since I kinda like this language but never passed the simple scripts stages. I want to step up a gear regarding Python (using 2.6.5) and don't know what to expect or what framework to choose from: Django, Pylons, web2py etc. I also don't know how much these frameworks will offer me and how much will I have to write from scratch. I could use a comparison with Java if somebody can provide me with. I'm thinking at filter functionalities such as sitemesh, custom tags like JSTL; In Python, can I write clean pages of HTML with tags in them or write a lot of print statements (something like servlets did in Java etc? I don't know exactly how to phrase this question. I actually need a presentation of how web development is performed in Python, at what level, and what the web frameworks bring to the table. Can you share from your experience? TIA!

Python web frameworks vs Java web frameworks (how is web development in Python done?)

0

0.099668

1

0

5,940

4,909,306

2011-02-05T19:57:00.000

3

1

0

java,python,templates,web-frameworks

0

6,586,407

0

4

0

false

1

0

hi try bottle python framework (bottle.paws.de / bottlepy.org) its really nice to use blistering fast and gets out of your way + the best thing about it is that its one single file to import, i recently migrated from PHP and i have to tell you am so ... loving it!

2

6

0

I am thinking in starting a personal pet web project to experiment with different things and extend my knowledge. I use Java a lot at work (for web applications :D) and was thinking in making my own in Python since I kinda like this language but never passed the simple scripts stages. I want to step up a gear regarding Python (using 2.6.5) and don't know what to expect or what framework to choose from: Django, Pylons, web2py etc. I also don't know how much these frameworks will offer me and how much will I have to write from scratch. I could use a comparison with Java if somebody can provide me with. I'm thinking at filter functionalities such as sitemesh, custom tags like JSTL; In Python, can I write clean pages of HTML with tags in them or write a lot of print statements (something like servlets did in Java etc? I don't know exactly how to phrase this question. I actually need a presentation of how web development is performed in Python, at what level, and what the web frameworks bring to the table. Can you share from your experience? TIA!

Python web frameworks vs Java web frameworks (how is web development in Python done?)

0

0.148885

1

0

5,940

4,910,510

2011-02-05T23:48:00.000

1

0

python,algorithm,gps,gis,data-mining

0

4,919,289

0

2

0

false

0

1) Extracting trajectories I think you are in right direction. There are probably will be some noise in gps data, and random walking, you should do some smooth like splines to overcome it. 2) Mining the trajectories Is there are any business sense in similar trajectories? (This will help build distance metric and then you can use some of mahoot clustering algorithms) 1. I think point where some person stoped are more interesting so you can generate statistics for popularity of places. 2. If you need route similarity to find different paths to same start-end you need to cluster first start end location and then similare curves by (maximum distance beetween, integral distance - some of well known functional metrics)

1

10

1

0

I've got 2 questions on analyzing a GPS dataset. 1) Extracting trajectories I have a huge database of recorded GPS coordinates of the form (latitude, longitude, date-time). According to date-time values of consecutive records, I'm trying to extract all trajectories/paths followed by the person. For instance; say from time M, the (x,y) pairs are continuously changing up until time N. After N, the change in (x,y) pairs decrease, at which point I conclude that the path taken from time M to N can be called a trajectory. Is that a decent approach to follow when extracting trajectories? Are there any well-known approaches/methods/algorithms you can suggest? Are there any data structures or formats you would like to suggest me to maintain those points in an efficient manner? Perhaps, for each trajectory, figuring out the velocity and acceleration would be useful? 2) Mining the trajectories Once I have all the trajectories followed/paths taken, how can I compare/cluster them? I would like to know if the start or end points are similar, then how do the intermediate paths compare? How do I compare the 2 paths/routes and conclude if they are similar or not. Furthermore; how do I cluster similar paths together? I would highly appreciate it if you can point me to a research or something similar on this matter. The development will be in Python, but all kinds of library suggestions are welcome. Thanks in advance.

Comparing/Clustering Trajectories (GPS data of (x,y) points) and Mining the data

0

0.099668

1

0

6,451

4,910,541

2011-02-05T23:54:00.000

1

0

php,python,eclipse,configuration

0

4,910,592

0

1

0

true

0

you shouldn't have to do anything to eclipse, or any editor, if php\python is installed you can call them from the command line.

1

0

I want to run php or python scripts from eclipse that will create folders and files and give them content. I think I know what to write for the php or python code but I am having trouble on what I need to do in eclipse to run my script. I would also like to provide my script with arguments such as folder names through a prompt on the eclipse side. I think I have to do something from Run-> External Tools -> External Tools Configuration. Please Help, Thank you.

configurations eclipse

0

1.2

1

0

132

4,931,244

2011-02-08T09:10:00.000

1

0

1

0

python,bluetooth,ubuntu-10.10

0

4,931,264

0

1

0

true

0

Invoke org.bluez.Adapter.SetProperty(u'Name', u'New name here') in the /org/bluez/<pid>/<device> object path on the org.bluez D-Bus bus.

1

0

I'm using PyBluez on Ubuntu 10.10. I would like to know how is possible to change the bluetooth name of the local device in software. I couldn't find any command related..

Change Bluetooth name Python

0

1.2

1

0

1,096

4,935,257

2011-02-08T15:56:00.000

1

0

1

0

python,http,windows-services,scheduled-tasks

0

4,955,373

0

3

0

false

0

This is trivially easy with a scheduled task which is the native Windows way to schedule tasks! There's no need for cygwin or Python or anything like that. I have such a task running on my machine which pokes my Wordpress blog every few hours. The script is just a .bat file which calls wget. The task is configured to "Run whether user is logged on or not" which ensures that it runs when I'm not logged on. There's no "black cmd window". You didn't say which version of Windows you are on and if you are on XP (unlucky for you if you are) then the configuration is probably different since the scheduled task interface changed quite a bit when Vista came out.

2

1

0

I need to install on one of my Windows PC's some software that will periodically send a short HTTP POST request to my remote development server. The request is always the same and should get sent every minute. What would you recommend as the best approach for that? The things I considered are: 1. Creating a Windows service 2. Using a script in python (I have cygwin installed) 3. Scheduled task using a batch file (although I don't want the black cmd window to pop up in my face every minute) Thanks for any additional ideas or hints on how to best implement it.

How to periodically create an HTTP POST request from windows

0

0.066568

1

0

1

2,416

4,935,257

2011-02-08T15:56:00.000

2

0

1

0

python,http,windows-services,scheduled-tasks

0

4,935,443

0

3

0

false

0

If you have cygwin, you probably have cron - run a python script from your crontab.

2

1

0

I need to install on one of my Windows PC's some software that will periodically send a short HTTP POST request to my remote development server. The request is always the same and should get sent every minute. What would you recommend as the best approach for that? The things I considered are: 1. Creating a Windows service 2. Using a script in python (I have cygwin installed) 3. Scheduled task using a batch file (although I don't want the black cmd window to pop up in my face every minute) Thanks for any additional ideas or hints on how to best implement it.

How to periodically create an HTTP POST request from windows

0

0.132549

1

0

1

2,416

4,935,387

2011-02-08T16:08:00.000

1

0

1

0

python,bash,streaming,video-streaming,multimedia

0

4,935,406

0

1

0

true

0

what about trying pyffmpeg out. you should be able to get the container info from that.

1

0

I have 2 video streams (1) VLC Generated Compressed MP4 UDP stream (2) DV Uncompressed UDP Stream Both are destined to a host. At this Unix receiving host, I would like to detect type of stream coming using Bash or Python Scripting (without tcpdump, I do not have root priv.) ANY idea guys how to implement ? Thank you.

Detecting Type of Video Stream

0

1.2

1

0

281

4,937,817

2011-02-08T20:08:00.000

0

python,mongodb,pymongo

0

4,941,686

0

2

0

false

0

Does make any sense. The object id is core part of each document. Convert the BSON/JSON document to a native datastructure (depending on your implementation language) and remove _id on this level. Apart from that it does not make much sense what you are trying to accomplish.

1

0

I am having problem when I do a query to mongodb using pymongo. I do not know how to avoid getting the _id for each record. I am doing something like this, result = db.meta.find(filters, [ 'model', 'fields.parent', 'fields.status', 'fields.slug', 'fields.firm', 'fields.properties']) I do not want to iterate the cursor elements only to delete a field. Thanks, Joaquin

PYMongo: Keep returning _id in every record after quering, How can I exclude this record?

0

1

0

803

4,938,556

2011-02-08T21:17:00.000

5

0

python,r,plot,rpy2

0

4,938,599

0

2

1

true

0

1

Plot to a graphics file using jpeg(), png() or another device, then display that file on your wxWidget.

1

3

1

0

I'm writing a program in Python. The first thing that happens is a window is displayed (I'm using wxPython) that has some buttons and text. When the user performs some actions, a plot is displayed in its own window. This plot is made with R, using rpy2. The problem is that the plot usually pops up on top of the main window, so the user has to move the plot to see the main window again. This is a big problem for the user, because he's lazy and good-for-nothing. He wants the plot to simply appear somewhere else, so he can see the main window and the plot at the same time, without having to lift a finger. Two potential solutions to my problem are: (1) display the plot within a wxPython frame (which I think I could control the location of), or (2) be able to specify where on the screen the plot window appears. I can't figure out how to do either.

How do I control where an R plot is displayed, using python and rpy2?

0

1.2

1

0

757

4,941,125

2011-02-09T03:50:00.000

0

python,django,django-models

0

4,966,022

0

2

0

false

1

0

It may be more hassle to try to use multiple profiles with the simplistic configuration of UserProfile. I would suggest using UserProfile with generic foreign key, or completely ditch UserProfile and create separate models with a User foreign key. If you are going to have a lot of data attached to these extra user profiles, I would keep them in models separate from UserProfile. My personal opinion about UserProfile is that it can quickly become the dumping ground for user data that doesn't have a nice home. Don't think that you have to use UserProfile just because your data sounds like it is profile information. I don't think UserProfile was ever intended to solve all the problems. I see it as a way to make up for the fact that the code for the User model is under django code and we don't generally mess with it to add user data.

1

2

0

Assuming I have different profiles for different user types - staff, teacher,students: How do I specify AUTH_PROFILE_MODULE in order to get back the appropriate profile with get_profile?

django how to use AUTH_PROFILE_MODULE with multiple profiles?

0

1

0

1,474

4,941,162

2011-02-09T03:56:00.000

1

0

python,eclipse,matplotlib

0

5,640,511

0

1

0

true

0

import matplotlib.pyplot as mp mp.ion() mp.plot(x,y) mp.show()

1

0

I can draw matplotlib graph in command line(shell) environment, but I find that I could not draw the same graph inside the eclipse IDE. such as plot([1,2,3]) not show in eclipse, I writed show() in the end but still not show anything my matplotlib use GTKAgg as backend, I use Pydev as plugin of eclipse to develop python.

How to draw matplotlib graph in eclipse?

0

1.2

1

0

3,911

4,946,837

2011-02-09T15:21:00.000

0

1

0

c++,python,boost-python

0

4,959,254

0

2

0

true

0

Unfortunately, the standard indexing_suite from Boost.Python does not support std::set. There is a indexing_suite v2, that works on all stl containers. (http://mail.python.org/pipermail/cplusplus-sig/2009-July/014704.html) It may not have made it to the official distribution, but you can find it by asking around. (http://mail.python.org/pipermail/cplusplus-sig/2009-July/014691.html) I found it to be harder to use then the original indexing_suite, but it might fit your needs. If that does not work, you can just manually wrap std::set<std::string> like you would any other class. This will get you a std::set<std::string> into python, where you can turn it into a python set fairly easily. I think that both of those are more work then is called for though. Here is what I would do: First, wrap the function in C++ with one that has the same signature, but stuffs the returned data in to a std::vector<std::string> instead of a std::set<std::string>. expose that function rather then the original Now you have the data in python. Second, wrap the c++ function in python function that takes the data in that std::vector<std::string> and stuffs it into a python set. Yes, this is rather silly from a design aesthetics point of view, and not the most performant code in the world, but is gets you to where you are going with a minimum of code, and it is fairly robust.

2

5

0

I have some C++ methods that have std::set<std::string> as argument or return value. I would like to map this to a Python frozenset (or regular set) but there does not seem to be a straightforward way to do this. Does anyone know how one may accomplish this task.

Create and access frozenset with Boost Python

0

1.2

1

0

741

4,946,837

2011-02-09T15:21:00.000

1

0

1

0

c++,python,boost-python

0

13,380,546

0

2

0

false

0

Or you can use std::map<YourType, int> instead of std::set<YourType>, the value can be for example 0. std::map has the same insert/search time complexity as std::set, it also keeps the keys ordered, it will only bloat the memory a little. Then you can use map indexing suite and in python you can hide the difference in some wrapper class if needed. The disanvantage is that you have to modify your existing c++ code a little bit.

2

5

0

I have some C++ methods that have std::set<std::string> as argument or return value. I would like to map this to a Python frozenset (or regular set) but there does not seem to be a straightforward way to do this. Does anyone know how one may accomplish this task.

Create and access frozenset with Boost Python

0

0.099668

1

0

741

4,962,022

2011-02-10T20:02:00.000

0

1

0

python,multithreading

0

4,962,704

0

2

0

false

1

0

You can do this using any of: the thread module (if your task is a function) the threading module (if you want to write your task as a subclass of threading.Thread) the multiprocessing module (which uses a similar interface to threading) All of these are available in the Python standard library (2.6 and later), and you can get the multiprocessing module for earlier versions as well (it just wasn't packaged with Python yet).

1

2

0

Say I have a simple function, it connects to a database (or a queue), gets a url that hasn't been visited, and then fetches the HTML at the given URL. Now this process is serial, i.e. it will only fetch the html from a given url one at a time, how can I make this faster by doing this in a group of threads?

In python, is it easy to call a function multiple times using threads?

0

1

0

1,238

4,962,202

2011-02-10T20:21:00.000

1

0

1

0

python,dijkstra

0

4,962,223

0

5

0

false

0

Encapsulate that information in a Python object and you should be fine.

2

0

1

0

I need to implement Dijkstra's Algorithm in Python. However, I have to use a 2D array to hold three pieces of information - predecessor, length and unvisited/visited. I know in C a Struct can be used, though I am stuck on how I can do a similar thing in Python, I am told it's possible but I have no idea to be honest

Python - Dijkstra's Algorithm

0

0.039979

1

0

5,571

4,962,202

2011-02-10T20:21:00.000

0

1

0

python,dijkstra

0

4,962,291

0

5

0

false

0

Python is object oriented language. So think of it like moving from Structs in C to Classes of C++. You can use the same class structure in Python as well.

2

0

1

0

I need to implement Dijkstra's Algorithm in Python. However, I have to use a 2D array to hold three pieces of information - predecessor, length and unvisited/visited. I know in C a Struct can be used, though I am stuck on how I can do a similar thing in Python, I am told it's possible but I have no idea to be honest

Python - Dijkstra's Algorithm

0

1

0

5,571

4,966,509

2011-02-11T07:16:00.000

0

1

0

1

python,attributes,introspection,metaclass

0

4,967,128

0

4

0

false

0

To create attributes during runtime, just add them in self.__dict__['foo'] = 'I'm foo' in the class code.

1

0

I apologize for not giving this question a better title; the reason that I am posting it is that I don't even have the correct terminology to know what I am looking for. I have defined a class with an attribute 'spam': def SpamClass(object): def __init__(self, arg): self.spam = arg def __str__(self): return self.spam I want to create a (sub/sibling?)class that has exactly the same functionality, but with an attribute named 'eggs' instead of 'spam': def EggsClass(object): def __init__(self, arg): self.eggs = arg def __str__(self): return self.eggs To generalize, how do I create functionally-identical classes with arbitrary attribute names? When the class has complicated behavior, it seems silly to duplicate code. Update: I agree that this smells like bad design. To clarify, I'm not trying to solve a particular problem in this stupid way. I just want to know how to arbitrarily name the (non-magic) contents of an object's __dict__ while preserving functionality. Consider something like the keys() method for dict-like objects. People create various classes with keys() methods that behave according to convention, and the naming convention is a Good Thing. But the name is arbitrary. How can I make a class with a spam() method that exactly replaces keys() without manually substituting /keys/spam/ in the source? Overloading __getattr__ and friends to reference the generic attribute seems inelegant and brittle to me. If a subclass reimplements these methods, it must accommodate this behavior. I would rather have it appear to the user that there is simply a base class with a named attribute that can be accessed naively. Actually, I can think of a plausible use case. Suppose that you want a mixin class that confers a special attribute and some closely related methods that manipulate or depend upon this attribute. A user may want to name this special attribute differently for different classes (to match names in the real-world problem domain or to avoid name collisions) while reusing the underlying behavior.

creating Python classes with arbitrarily substituted attribute name

1

0

1

0

722

4,967,179

2011-02-11T09:01:00.000

0

1

0

python,pyqt

1

4,968,555

0

2

0

false

0

1

If the field's an ordinary attribute called text and your Design instance is called design, you can access (read/write) it from anywhere as design.text.

2

0

I want to read data from a text field. The name of the text field is not defined of found in the other class with methods of reading the text field. The textfield is defined in the Design class. now how do I access this field from another class, so I can read data from it. Thanks!! Edit: I have 2 Classes: FeatureImportCommonWidget(QtGui.QWidget) and MetaDataBrowser. FeatureImportCommonWidget contains a Text Field called placesGroupBox. I want to access this text field in the MetaDataBrowser Class. I tried it using "filename = get_metadata.placesGroupBox.text()", but it gives an error about placesGroupBox not being defined in the MetaDataBrowser class.

Python Referencing

0

1

0

179

4,967,179

2011-02-11T09:01:00.000

0

1

0

python,pyqt

1

17,676,533

0

2

0

false

0

1

1. if object of FeatureImportCommonWidget class is created inside of MetaDataBrowser class, you can access your text field anywhere inside MetaDataBrowser class like this: FeatureImportCommonWidgetObjectName.placesGroupBox.text() 2 if object of FeatureImportCommonWidget class is created before MetaDataBrowser class, you can pass that object as parameter to MetaDataBrowser class and then access your text field anywhere inside MetaDataBrowser class like in step 1

2

0

I want to read data from a text field. The name of the text field is not defined of found in the other class with methods of reading the text field. The textfield is defined in the Design class. now how do I access this field from another class, so I can read data from it. Thanks!! Edit: I have 2 Classes: FeatureImportCommonWidget(QtGui.QWidget) and MetaDataBrowser. FeatureImportCommonWidget contains a Text Field called placesGroupBox. I want to access this text field in the MetaDataBrowser Class. I tried it using "filename = get_metadata.placesGroupBox.text()", but it gives an error about placesGroupBox not being defined in the MetaDataBrowser class.

Python Referencing

0

1

0

179

4,980,756

2011-02-12T21:30:00.000

2

1

0

1

python,web,web-frameworks,web-scripting

0

4,980,831

0

4

0

true

1

0

The Python web frameworks have nothing to do with GUIs, and can all be used via the terminal. The benefits of a framework, as you say, are all to do with making your life easier by supplying the components you need to build a website: the main ones are database interaction through an ORM, a templating system, and URL routing. On top of that, the big frameworks also included optional extras like user authentication, administration interface, and so on. Personally I like Django, but your mileage may vary: I would say, though, that whatever you do with Python and the web will require some sort of framework, even if it's one of the absolute minimal ones like Flask which basically do just the routing part. There's simply no point in writing all this stuff from scratch when it's been done for you.

2

1

0

I've been learning python for use in ArcGIS and some other non-web applications. However, now that I've taken on building a personal website I am interested in using it for web development (as it is the only scripting language I currently know). I've noticed that there are a lot of these things called "frameworks", such as Django. From what I understand they are just a collection of packages to save you from re-inventing the wheel but I don't really know how they work. Furthermore, I do not like GUIs, if I need a framework I would like to find one that could be used through a terminal, starts out simple and can be scaled for more complexity when I'm ready. Any advice or ideas on frameworks and why I would want to use one?

I'm learning python and am interested in using it for web-scripting. What frameworkes are out there and do I need one?

0

1.2

1

0

553

4,980,756

2011-02-12T21:30:00.000

0

1

0

1

python,web,web-frameworks,web-scripting

0

4,981,185

0

4

0

false

1

0

Personnally, I don't use any framework, I write either from scratch on BaseHTTPServer, or using WSGI (with mod_wsgi). It is a bit long to write the skeleton, but I think it is faster (I mean at runtime), there is less constraints, and there is lesser to learn.

2

1

0

I've been learning python for use in ArcGIS and some other non-web applications. However, now that I've taken on building a personal website I am interested in using it for web development (as it is the only scripting language I currently know). I've noticed that there are a lot of these things called "frameworks", such as Django. From what I understand they are just a collection of packages to save you from re-inventing the wheel but I don't really know how they work. Furthermore, I do not like GUIs, if I need a framework I would like to find one that could be used through a terminal, starts out simple and can be scaled for more complexity when I'm ready. Any advice or ideas on frameworks and why I would want to use one?

I'm learning python and am interested in using it for web-scripting. What frameworkes are out there and do I need one?

0

1

0

553

4,986,467

2011-02-13T19:50:00.000

1

0

1

0

python,transactions,pickle,undo

0

4,986,678

0

2

0

true

0

Well, as you mentioned the data design is loosely coupled, so you I don't think you need to pickle it if it's in memory. Just take a copy of all the relevant variables, and the transaction.abort() would just copy them back, and transaction.commit() would then just remove the copy of the data. There are issues, but none that you don't have with the pickle solution.

2

1

0

A user can perform an action, which may trigger dependent actions (which themselves may have dependent actions) and I want to be able to cancel the whole thing if the user cancels a dependent action. The typical way I've seen this done is some variant of an undo stack and each action will need to know how to undo itself, and then if a child action is cancelled the undo's cascade their way up. Sometimes writing undo methods are tricky and there isn't always enough information in context to properly know how to undo an action in an isolated manner. I just thought of a (potentially) easier way which is to just pickle the state of the (relevant parts of) program, and then the cancel would just restore to it's former state, without needing to create separate undo logic for each action. Has anyone tried this? Any gotchas to watch out for? Any reason not to do this? Edit: The dependent actions must happen after the parent action (and even whether there are dependent actions may depend on the result of the parent action), so just checking all the dependencies before doing anything isn't an option. I guess you could say an action triggers other actions, but if one of the triggered actions cannot be performed, then none of it happened.

Using pickle for in-memory "transaction"?

0

1.2

1

0

310

4,986,467

2011-02-13T19:50:00.000

1

0

1

0

python,transactions,pickle,undo

0

4,986,707

0

2

0

false

0

You can use pickle to store your state if all elements of state are serializable (usually they are). The only reasons for not doing so: if you have to store pointers to any objects that are not saved in state, you will have problems with these pointers after performing undo operation. this method could be expensive, depending on the size of your state. Also you can use zip() to lower memory usage in exchange of raising CPU usage.

2

1

0

A user can perform an action, which may trigger dependent actions (which themselves may have dependent actions) and I want to be able to cancel the whole thing if the user cancels a dependent action. The typical way I've seen this done is some variant of an undo stack and each action will need to know how to undo itself, and then if a child action is cancelled the undo's cascade their way up. Sometimes writing undo methods are tricky and there isn't always enough information in context to properly know how to undo an action in an isolated manner. I just thought of a (potentially) easier way which is to just pickle the state of the (relevant parts of) program, and then the cancel would just restore to it's former state, without needing to create separate undo logic for each action. Has anyone tried this? Any gotchas to watch out for? Any reason not to do this? Edit: The dependent actions must happen after the parent action (and even whether there are dependent actions may depend on the result of the parent action), so just checking all the dependencies before doing anything isn't an option. I guess you could say an action triggers other actions, but if one of the triggered actions cannot be performed, then none of it happened.

Using pickle for in-memory "transaction"?

0

0.099668

1

0

310

4,994,058

2011-02-14T15:39:00.000

0

1

0

python,macos,wxpython,pyobjc

0

5,071,853

0

2

0

false

0

1

What do you need Xcode for? If you need it for the windows/gui (*.nib, *.xib files), then you should perhaps search for 'creating *.nib, *xib without Xcode'. That's only a search hint and no satisfying answer.

1

6

0

1

I'm writing a small cross-platform wxPython app, however on every platform I need to use some platform-specific API. On Mac OS it can be done using PyObjC. I'm searching for tutorial on how to use PyObjC. However, all I found so far were tutorials with Xcode. I want my app to be able to run on mac/win/lin, without changes, and I don't want to develop it in Xcode. Is there a way? UPD. To be more specific I need to access some pen-tablet events from Mac OS X and I wanted to use PyObjC for that (I don't see any other ways).

PyObjC tutorial without Xcode

0

1

0

3,791

4,994,838

2011-02-14T16:55:00.000

1

0

1

python,web-applications,turbogears2

1

5,003,413

0

2

0

false

0

Hey, I got it right somehow. The problem seems to be version mismatch between SA 0.6 & sqlautocode 0.6 Seems that they don't work in tandom. So I removed those & installed SA 0.5 Now it's working. Thanks, Vineet Deodhar.

1

2

0

I am using TG2.1 on WinXP. Python ver is 2.6. Trying to use sqlautocode (0.5.2) for working with my existing MySQL schema. SQLAlchemy ver is 0.6.6 import sqlautocode # works OK While trying to reflect the schema ---- sqlautocode mysql:\\username:pswd@hostname:3306\schema_name -o tables.py SyntaxError: invalid syntax is raised. Can someone please point out what's going wrong, & how to handle the same? Thanks, Vineet.

sqlautocode for mysql giving syntax error

0

0.099668

1

0

659