Q_Id
int64 2.93k
49.7M
| CreationDate
stringlengths 23
23
| Users Score
int64 -10
437
| Other
int64 0
1
| Python Basics and Environment
int64 0
1
| System Administration and DevOps
int64 0
1
| DISCREPANCY
int64 0
1
| Tags
stringlengths 6
90
| ERRORS
int64 0
1
| A_Id
int64 2.98k
72.5M
| API_CHANGE
int64 0
1
| AnswerCount
int64 1
42
| REVIEW
int64 0
1
| is_accepted
bool 2
classes | Web Development
int64 0
1
| GUI and Desktop Applications
int64 0
1
| Answer
stringlengths 15
5.1k
| Available Count
int64 1
17
| Q_Score
int64 0
3.67k
| Data Science and Machine Learning
int64 0
1
| DOCUMENTATION
int64 0
1
| Question
stringlengths 25
6.53k
| Title
stringlengths 11
148
| CONCEPTUAL
int64 0
1
| Score
float64 -1
1.2
| API_USAGE
int64 1
1
| Database and SQL
int64 0
1
| Networking and APIs
int64 0
1
| ViewCount
int64 15
3.72M
|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
3,403,168 | 2010-08-04T06:40:00.000 | 0 | 0 | 0 | 0 | 0 | python,escaping,html-entities | 0 | 3,405,525 | 0 | 4 | 0 | false | 1 | 0 | You shouldn't use an XML parser to parse data that isn't XML. Find an HTML parser instead, you'll be happier in the long run. The standard library has a few (HTMLParser and htmllib), and BeautifulSoup is a well-loved third-party package. | 1 | 1 | 0 | 0 | I'm scraping a html page, then using xml.dom.minidom.parseString() to create a dom object.
however, the html page has a '&'. I can use cgi.escape to convert this into & but it also converts all my html <> tags into <> which makes parseString() unhappy.
how do i go about this? i would rather not just hack it and straight replace the "&"s
thanks | need to selectively escape html entities (&) | 0 | 0 | 1 | 0 | 1 | 576 |
3,409,226 | 2010-08-04T19:41:00.000 | 2 | 1 | 0 | 1 | 0 | python,eclipse,intellisense,pydev | 0 | 3,409,335 | 0 | 3 | 0 | false | 0 | 0 | I'm using eclipse 3.6 and pydev with python 2.6 and it's the best one I've tested up to now. I didn't try 3.5 so not sure if it's the same as yours but I think it autocompletes well compared to others I tried but I didn't try any of the paid ones. | 3 | 0 | 0 | 0 | Does anyone know how to get an intellisense like functionality (better than default) in eclipse for python development? I am using Eclipse 3.5 with aptana and pydev and the interpreter is python 2.5.2 | How do you get Intellisense for Python in Eclipse/Aptana/Pydev? | 0 | 0.132549 | 1 | 0 | 0 | 3,548 |
3,409,226 | 2010-08-04T19:41:00.000 | 3 | 1 | 0 | 1 | 0 | python,eclipse,intellisense,pydev | 0 | 3,409,439 | 0 | 3 | 0 | false | 0 | 0 | You are probably never going to get something as good as intellisense for python. Due to the dynamic nature of python, it is often impossible to be able to know the type of some variables.
And if you don't know their types, you can't do auto-complete on things like class members.
Personally, I think the auto-complete in PyDev is pretty good, given the nature of python. It isn't as good as for Java and probably won't be, but it sure beats not having anything.
Having said that, I haven't tried if PyDev is able to use the parameter types you can specify in python 3.x. Otherwise, that might be an improvement that could make life a little easier.
Update: Got curious and did a quick test, Looks like optional type information in python 3 is not used by PyDev. | 3 | 0 | 0 | 0 | Does anyone know how to get an intellisense like functionality (better than default) in eclipse for python development? I am using Eclipse 3.5 with aptana and pydev and the interpreter is python 2.5.2 | How do you get Intellisense for Python in Eclipse/Aptana/Pydev? | 0 | 0.197375 | 1 | 0 | 0 | 3,548 |
3,409,226 | 2010-08-04T19:41:00.000 | 0 | 1 | 0 | 1 | 0 | python,eclipse,intellisense,pydev | 0 | 9,141,159 | 0 | 3 | 0 | false | 0 | 0 | In Aptana I added the reference to the .egg file to the system PYTHONPATH in Preferences menu. I am not sure if this works for every library out there.
Preferences --> PyDev --> Interpreter Python --> Libraries tab on the right. | 3 | 0 | 0 | 0 | Does anyone know how to get an intellisense like functionality (better than default) in eclipse for python development? I am using Eclipse 3.5 with aptana and pydev and the interpreter is python 2.5.2 | How do you get Intellisense for Python in Eclipse/Aptana/Pydev? | 0 | 0 | 1 | 0 | 0 | 3,548 |
3,411,131 | 2010-08-05T01:30:00.000 | 1 | 0 | 0 | 0 | 0 | python,django,path,django-manage.py,devserver | 1 | 3,411,300 | 0 | 2 | 0 | true | 1 | 0 | manage.py imports settings.py from the current directory and pass settings as parameter to execute_manager. You probably defined project root in settings.py. | 1 | 0 | 0 | 0 | I recently moved a django app from c:\Users\user\django-projects\foo\foobar to c:\Python25\Lib\site-packages\foo\foobar (which is on the python path). I started a new app in the django-projects directory, and added foo.foobar to the INSTALLED_APPS setting. When I try to run the dev server (manage.py runserver) for my new app, I get the error ImportError: No module named foobar.
Looking through the traceback, it's looking in the c:\Users\user\django-projects\foo\..\foo\foobar for the foobar app. I checked my PATH and PYTHONPATH environment variables, and neither point to c:\Users\user\django-projects\foo and It doesn't show up in sys.path when I run the python interpreter.
I'm guessing I somehow added c:\Users\user\django-projects\foo to django's path sometime along the development of foo but I don't remember how I did it.
So, with all that lead up, my question is "how do I make manage.py look in c:\Python25\Lib\site-packages instead of c:\Users\user\django-projects\foo?"
Thanks,
Lexo | Where does django dev server (manage.py runserver) get its path from? | 0 | 1.2 | 1 | 0 | 0 | 2,351 |
3,423,510 | 2010-08-06T11:58:00.000 | 0 | 1 | 0 | 0 | 0 | python,comparison,md5 | 0 | 3,423,577 | 0 | 3 | 0 | false | 0 | 0 | You can log in using ssh and make a md5 hash for the file remotely and a md5 hash for the current local file. If the md5s are matching the files are identicaly, else they are different. | 2 | 2 | 0 | 0 | I have the following problem: I have a local .zip file and a .zip file located on a server. I need to check if the .zip file on the server is different from the local one; if they are not I need to pull the new one from the server. My question is how do I compare them without downloading the file from the server and comparing them locally?
I could create an MD5 hash for the zip file on the server when creating the .zip file and then compare it with the MD5 of my local .zip file, but is there a simpler way? | Comparing local file with remote file | 1 | 0 | 1 | 0 | 0 | 4,055 |
3,423,510 | 2010-08-06T11:58:00.000 | 0 | 1 | 0 | 0 | 0 | python,comparison,md5 | 0 | 3,423,559 | 0 | 3 | 0 | false | 0 | 0 | I would like to know how you intend to compare them locally, if it were the case. You can apply the same logic to compare them remotely. | 2 | 2 | 0 | 0 | I have the following problem: I have a local .zip file and a .zip file located on a server. I need to check if the .zip file on the server is different from the local one; if they are not I need to pull the new one from the server. My question is how do I compare them without downloading the file from the server and comparing them locally?
I could create an MD5 hash for the zip file on the server when creating the .zip file and then compare it with the MD5 of my local .zip file, but is there a simpler way? | Comparing local file with remote file | 1 | 0 | 1 | 0 | 0 | 4,055 |
3,427,795 | 2010-08-06T21:05:00.000 | 3 | 0 | 1 | 0 | 0 | .net,python,language-agnostic,naming-conventions | 0 | 3,427,822 | 0 | 12 | 0 | false | 0 | 0 | I'd recommend purchasing a copy of "Clean Code" by Robert C. Martin. It is full of great suggstions ranging from naming conventions to how to write easy-to-understand functions and much more. Definitely worth a read. I know it influenced my coding style since reading it. | 7 | 4 | 0 | 1 | as you can probably tell from my previous posts i have horrific naming conventions. do you know of any tutorials dealing with how to name stuff? | are there tutorials on how to name variables? | 0 | 0.049958 | 1 | 0 | 0 | 509 |
3,427,795 | 2010-08-06T21:05:00.000 | 2 | 0 | 1 | 0 | 0 | .net,python,language-agnostic,naming-conventions | 0 | 3,427,834 | 0 | 12 | 0 | false | 0 | 0 | Have you read Code Complete? He does a full treatise on this in the book. Definitely the best naming strategy I've seen in print... And it's easy to find like 1000 programmers at the drop of a hat who name this one of the top 5 resources for programmers and program design.
Just my $.05 | 7 | 4 | 0 | 1 | as you can probably tell from my previous posts i have horrific naming conventions. do you know of any tutorials dealing with how to name stuff? | are there tutorials on how to name variables? | 0 | 0.033321 | 1 | 0 | 0 | 509 |
3,427,795 | 2010-08-06T21:05:00.000 | 3 | 0 | 1 | 0 | 0 | .net,python,language-agnostic,naming-conventions | 0 | 3,427,856 | 0 | 12 | 0 | false | 0 | 0 | There are many different views on the specifics of naming conventions, but the overall gist could be summed up as:
Each variable name should be relevant
to whatever data is stored in the
variable.
Your naming scheme should be consistent.
So a major no-no would be
single letter variables (some people
use i and j for indexing loops, which
is OK because every programmer knows
what they are. Nevertheless, I prefer
'idx' instead of 'i'). Also out are
names like 'method1', it means nothing
- it should indicate what the variable holds.
Another (less common) convention is the 'Hungarian' notation where the data type is prefixed to the variable name such as 'int i_idx'. This is quite useless in modern, object oriented programming languages. Not to mention a blatant violation of the DRY principle.
The second point, consistency, is just as important. camelCase, UpperCamelCase, whatever - just don't switch between them for no reason.
You'll find that naming conventions vary from language to language and often, a company will have their own rules on naming.
Its a worthwhile investment to properly name your variables because when you come to maintain your code much later on and you have forgotten what everything means, it will pay dividends. | 7 | 4 | 0 | 1 | as you can probably tell from my previous posts i have horrific naming conventions. do you know of any tutorials dealing with how to name stuff? | are there tutorials on how to name variables? | 0 | 0.049958 | 1 | 0 | 0 | 509 |
3,427,795 | 2010-08-06T21:05:00.000 | 1 | 0 | 1 | 0 | 0 | .net,python,language-agnostic,naming-conventions | 0 | 3,428,775 | 0 | 12 | 0 | false | 0 | 0 | It's not clear if your question relates to Python naming conventions.
If so, for starters I would try to follow just these simple rules:
ClassName - upper case for class names
variable_name - lower case and underscore for variables (I try to keep them at two words maximum) | 7 | 4 | 0 | 1 | as you can probably tell from my previous posts i have horrific naming conventions. do you know of any tutorials dealing with how to name stuff? | are there tutorials on how to name variables? | 0 | 0.016665 | 1 | 0 | 0 | 509 |
3,427,795 | 2010-08-06T21:05:00.000 | 5 | 0 | 1 | 0 | 0 | .net,python,language-agnostic,naming-conventions | 0 | 3,428,433 | 0 | 12 | 0 | false | 0 | 0 | A bad convention followed fully is better than a combination of different good "conventions" (which aren't conventions at all any more, if they aren't kept to).
However, a convention that is making something less clear than if it had been ignored, should be ignored.
Those are the only two I would state as any sort of rule. Beyond that convention preferences are a matter of opinions quickly turning into rants. The rest of this post is exactly that, and shouldn't be read as anything else.
For collections, use natural language plurals. In English, this means data, schemata, children, indices, criteria, formulae (and indeed foci, geese, feet, men, women, teeth) not made-up words like datums schemas, childs, indexes, criterions, formulas (and likewise focuses, gooses, foots, mans, womans, tooths, believe it or not I've actually seen some of those in use). Camel-casing and abbreviatiating does enough damage to English as it is, without doing more. Okay, I've never seen datums, but I have seen the meta-plural datas. Sweet Aradia, why?
That said, use American English for names, even if you use a different dialect of English. Most coders with such dialects have learnt to think of "color" as a word for colours in a computer context by the age of 12, and the principle applies more widely. If we can deal with "color" (one of Webster's worse bastardisations) we can deal with -ize and -ization (-ise and -isation is a pseudo-French 18th C affectation anyway, the Americans are the traditionalists on this one).
Similarly, if you aren't sure how to spell a word that you are using as the whole or part of a name, look it up (google it and see what google says). Somebody may spend a long time distracted by your misspelling that is so liberally distributed throughout running code as to make fixing it daunting.
Hungarian is bad (in many modern languages, though in some it has its place) but the principle is good. If you can tell a const, static, instance, local and parameter variable from each other in a split-second, that's good. If you can tell something of the intent immediately, that's good too.
Related to that, _ before public variables makes them non CLR compiant. That's actually a good thing for private variables (if you make them public for a quick experiment, and forget to fix the visibility, the compiler will warn you).
Remember Postel's Law, "be conservative in what you do, be liberal in what you accept from others". One example of this is to act as if you are using a case-sensitive langauge, even if you're using a case-insensitive one. A related one is to be more of a stickler in public names than private ones. Yet another is to pay more attention to following conventions well than to complaining about those who don't. | 7 | 4 | 0 | 1 | as you can probably tell from my previous posts i have horrific naming conventions. do you know of any tutorials dealing with how to name stuff? | are there tutorials on how to name variables? | 0 | 0.083141 | 1 | 0 | 0 | 509 |
3,427,795 | 2010-08-06T21:05:00.000 | 4 | 0 | 1 | 0 | 0 | .net,python,language-agnostic,naming-conventions | 0 | 3,428,164 | 0 | 12 | 0 | true | 0 | 0 | All the answers here are quite valid. Most important: be consistent.
That said, here are my rules (C#):
camelCase identifiers -- I personally
find this much easier to read than
underscores
Public properties start
with a capital letter
Something I
should never touch starts with an
underscore -- example, the backing
field to a property should only be
touched from the property. If I have
underscores elsewhere, I know I'm
wrong
Apps Hungarian where
appropriate -- ints describing row
IDs perhaps could be named
rowSelected, rowNextUnread, et
cetera. This is different than
Systems Hungarian, which would mark
them as ints such as iSelected,
iNextUnread. Systems Hungarian
doesn't add much if anything, where
Apps Hungarian gives information the
type doesn't: it tells me adding
rowItemsPerPage and colSelected is a
meaningless operation, even though it
compiles just fine. | 7 | 4 | 0 | 1 | as you can probably tell from my previous posts i have horrific naming conventions. do you know of any tutorials dealing with how to name stuff? | are there tutorials on how to name variables? | 0 | 1.2 | 1 | 0 | 0 | 509 |
3,427,795 | 2010-08-06T21:05:00.000 | 1 | 0 | 1 | 0 | 0 | .net,python,language-agnostic,naming-conventions | 0 | 3,428,577 | 0 | 12 | 0 | false | 0 | 0 | Can I make a shameless plug for the "Names" chapter in my book, "A Sane Approach to Database Design" ? I'm specifically talking about names for things in databases, but most of the same considerations apply to variables in programs. | 7 | 4 | 0 | 1 | as you can probably tell from my previous posts i have horrific naming conventions. do you know of any tutorials dealing with how to name stuff? | are there tutorials on how to name variables? | 0 | 0.016665 | 1 | 0 | 0 | 509 |
3,429,887 | 2010-08-07T09:23:00.000 | 3 | 1 | 0 | 0 | 0 | python,android,eclipse,workspace,eclipse-pdt | 0 | 3,430,003 | 0 | 2 | 0 | true | 1 | 0 | The plug-ins are stored in the Eclipse installation, not in the workspace folder. So one solution would be to different Eclipse installations for every task, in this case only the required plug-ins would load (and the others not available), on the other hand, you have to maintain at least three parallel Eclipse installations.
Another solution is to disable plug-in activation on startup: in Preferences/General/Startup and Shutdown you can disable single plug-ins not loading. The problem with this approach is, that this only helps to not load plug-ins, but its menu and toolbar contributions will be loaded. | 1 | 4 | 0 | 0 | I use Eclipse for programming in PHP (PDT), Python and sometimes Android. Each of this programming languages requires to run many things after Eclipse start.
Of course I do not use all of them at one moment, I have different workspace for each of those. Is there any way, or recommendation, how to make Eclipse to run only neccessary tools when opening defined workspace?
e.g.:
I choose /workspace/www/, so then only PDT tools will run
I choose /workspace/android/, so then only Android tools and buttons in toolbars will appears
Do I have to manually remove all unneccessary things from each of the workspace? Or it is either possible to remove all? | How to organize Eclipse - Workspace VS Programming languages | 1 | 1.2 | 1 | 0 | 0 | 741 |
3,433,559 | 2010-08-08T08:09:00.000 | 2 | 0 | 1 | 0 | 0 | python,time | 0 | 67,426,999 | 0 | 4 | 0 | false | 0 | 0 | If the non-block feature is not needed, just use time.sleep(5) which will work anywhere and save your life. | 2 | 57 | 0 | 0 | I want to know how to call a function after a certain time. I have tried time.sleep() but this halts the whole script. I want the script to carry on, but after ???secs call a function and run the other script at the same time | Python Time Delays | 0 | 0.099668 | 1 | 0 | 0 | 55,176 |
3,433,559 | 2010-08-08T08:09:00.000 | 5 | 0 | 1 | 0 | 0 | python,time | 0 | 3,434,738 | 0 | 4 | 0 | false | 0 | 0 | If you want a function to be called after a while and not to stop your script you are inherently dealing with threaded code. If you want to set a function to be called and not to worry about it, you have to either explicitly use multi-threading - like em Mark Byers's answr, or use a coding framework that has a main loop which takes care of function dispatching for you - like twisted, qt, gtk, pyglet, and so many others. Any of these would require you to rewrite your code so that it works from that framework's main loop.
It is either that, or writing some main loop from event checking yourself on your code -
All in all, if the only thing you want is single function calls, threading.Timer is the way to do it. If you want to use these timed calls to actually loop the program as is usually done with javascript's setTimeout, you are better of selecting one of the coding frameworks I listed above and refactoring your code to take advantage of it. | 2 | 57 | 0 | 0 | I want to know how to call a function after a certain time. I have tried time.sleep() but this halts the whole script. I want the script to carry on, but after ???secs call a function and run the other script at the same time | Python Time Delays | 0 | 0.244919 | 1 | 0 | 0 | 55,176 |
3,445,867 | 2010-08-10T03:43:00.000 | 2 | 0 | 0 | 0 | 0 | python,binding,tkinter | 0 | 3,445,919 | 0 | 1 | 0 | false | 0 | 1 | Tkinter, on its own, cannot grab keystrokes that (from the OS's/WM's viewpoint) were directed to other, unrelated windows -- you'll need to instruct your window manager, desktop manager, or "operating system", to direct certain keystrokes differently than it usually does. So, what platform do you need to support for this functionality? Each platform has different ways to perform this kind of functionality, of course. | 1 | 1 | 0 | 0 | I made a GUI with Tkinter, now how do I make it so when a key command will execute a command even if the Tkinter window is not in focus? Basically I want it so everything is bound to that key command.
Example:
Say I was browsing the internet and the focus was on my browser, I then type Ctrl + U. An event would then run on my program. | Key commands in Tkinter | 0 | 0.379949 | 1 | 0 | 0 | 515 |
3,450,525 | 2010-08-10T15:19:00.000 | 0 | 0 | 0 | 0 | 0 | python,event-handling,wxpython | 0 | 3,451,727 | 0 | 3 | 0 | false | 0 | 1 | In your init or OnInit method, do some kind of check to see if the program should run the startup process on startup (i.e. check a config file or some such). If yes, call the "scan" method using wx.CallAfter or wx.CallLater or call it after you Show() the frame. | 2 | 0 | 0 | 0 | OK, I'm trying to explain what I want to achieve in another way. Here's an example:
Say if it's an anti virus program, and user can choose between two ways to run the program, choice one, automatically start to scan disks for virus when the program starts up, choice two, hit the start button to make the program scan disks for virus after the program starts up any time the user wants. So, as a wxpython beginner, I know how to bind wx.EVT_BUTTON to let scanning start after the user hit the start button, but I don't know how to make the scanning start once the program starts up. I wonder if there's a program_start event I can bind? Hope you guys can help me out. Thanks! | Is there a wxpython event like program_start? | 0 | 0 | 1 | 0 | 0 | 372 |
3,450,525 | 2010-08-10T15:19:00.000 | 1 | 0 | 0 | 0 | 0 | python,event-handling,wxpython | 0 | 3,450,557 | 0 | 3 | 0 | false | 0 | 1 | Why don't you run it just in module code? This way it will be run only once, because code in module is run only once per program instance. | 2 | 0 | 0 | 0 | OK, I'm trying to explain what I want to achieve in another way. Here's an example:
Say if it's an anti virus program, and user can choose between two ways to run the program, choice one, automatically start to scan disks for virus when the program starts up, choice two, hit the start button to make the program scan disks for virus after the program starts up any time the user wants. So, as a wxpython beginner, I know how to bind wx.EVT_BUTTON to let scanning start after the user hit the start button, but I don't know how to make the scanning start once the program starts up. I wonder if there's a program_start event I can bind? Hope you guys can help me out. Thanks! | Is there a wxpython event like program_start? | 0 | 0.066568 | 1 | 0 | 0 | 372 |
3,452,729 | 2010-08-10T19:35:00.000 | 6 | 1 | 1 | 0 | 0 | python,ruby,perl,comparison | 0 | 3,454,618 | 0 | 3 | 0 | false | 0 | 0 | I'm learning Python (and it's my first programming language so don't be too intense with your reasons) and I wanted to know how it stacks up to other scripting languages, like Perl and Ruby. What is Python better in comparison to other scripting languages, and what is it worse for?
IMO.
I have tried Python 2.x for some time and went back to the Perl and C++.
What is good about Python. Python features better portability and has modern GUI libraries. Standard library in some places is also very very nice (I esp. liked random). Execution speed of arithmetic expressions beats that of Perl.
What is bad about Python. Poor documentation. No warnings, no typing whatsoever combined with weak typing/language's dynamic nature is a hell. Learning easy - using hard, mainly due to immature optimizer driving the need to think about performance edge cases quite early in the development cycle. (That some times reminded me of the Pascal.) OO is a mess at the moment: distinct features and differences between old-style and new-style classes are not spelled out very well; libraries do not mention what type of classes they do define.
Poor documentation probably should be highlighted. There are piles of standard functions but their purpose in life isn't really specified nor decent examples are given. And better half of those standard functions in Perl land would have been sitting somewhere in the perldoc perlguts. Anyhow, looking up stuff is much faster with Google.
Lack of warnings and lack of typing (and that compared to the weak Perl's use warnings/use strict and sub prototypes) is what in the end drove me back. Partially it is because that I write code faster than I can read it thus I like to rely on the compiler/interpreter to tell me where I might have wrote something I haven't really meant.
Also excuse me, but I would throw that at Python again: using indentation to denote code structure is kind'a kinky. I do not mind it per se and for short functions it is very nice. But after one week I have found that I do read Python code slower (compared to C++ or Perl) in greater part because I have to always extra check whether the statement really closed or it still goes on. If code doesn't fit one screen, it becomes a chore to always press PgDown/PgUp just to check. Never before I were that appreciative of the {}s.
All considered, Python is at the moment a mess. Worthy contender I do keep an eye on, but not mature enough for my daily needs. If I were making decision about learning Python now, I would have instead waited for Python 3.x to mature. Many things one would learn now with Python 2.x might be useless in Python 3.x. And Python 3.x is at the moment isn't very useful since many libraries were not yet ported to it.
P.S. Most bogus part I have encountered is the function pointers. I have discovered them sooner than I needed them by writing start_time = time.time and time_elapsed = time.time() - start_time. Half hour later when script finished instead of results I was presented with nice interpreter exception telling me that I cannot subtract function object. And the half hour was due to the standard for loop, as tutorials have taught me. Optimizations I have looked up later (range vs. xrange, manual loop unrolling) made the script run in less than one minute. | 1 | 1 | 0 | 0 | I'm learning Python (and it's my first programming language so don't be too intense with your reasons) and I wanted to know how it stacks up to other scripting languages, like Perl and Ruby. What is Python better in comparison to other scripting languages, and what is it worse for? | How does Python stack up to other scripting languages? | 0 | 1 | 1 | 0 | 0 | 1,331 |
3,462,951 | 2010-08-11T21:21:00.000 | 0 | 0 | 0 | 0 | 0 | python,django | 0 | 3,463,019 | 0 | 2 | 0 | false | 1 | 0 | Not all sequences of bytes are valid for ex. UTF-8, maybe you should check this? | 1 | 0 | 0 | 0 | The file is uploaded through a Django form. The contents of the file need to be saved into a models.TextField(), for editors to review it before publication.
I am already checking UploadedFile.content_type. I have considered using a regular input field, but as the text is going to be quite long, it would be unwieldy for users to cut and paste. | In Python, how do I check that a file is a text file? | 0 | 0 | 1 | 0 | 0 | 114 |
3,465,295 | 2010-08-12T06:41:00.000 | 4 | 1 | 0 | 1 | 1 | python,command,packaging,distutils | 0 | 3,466,094 | 0 | 2 | 0 | true | 0 | 0 | I wouldn't have any check at all. Document that your library requires this command, and if the user tries to use whatever part of your library needs it, an exception will be raised by whatever runs the command. It should still be possible to import your library and use it, even if only a subset of functionality is offered.
(PS: commands is old and broken and shouldn't be used in new code. subprocess is the hot new stuff.) | 1 | 3 | 0 | 0 | I'm looking for the most elegant way to notify users of my library that they need a specific unix command to ensure that it will works...
When is the bet time for my lib to raise an error:
Installation ?
When my app call the command ?
At the import of my lib ?
both?
And also how should you detect that the command is missing (if not commands.getoutput("which CommandIDependsOn"): raise Exception("you need CommandIDependsOn")).
I need advices. | How to depends of a system command with python/distutils? | 0 | 1.2 | 1 | 0 | 0 | 629 |
3,469,551 | 2010-08-12T15:52:00.000 | 1 | 0 | 1 | 0 | 0 | python,django,virtualenv,pip | 1 | 3,470,317 | 0 | 1 | 0 | true | 1 | 0 | it seems that the pip process quit prematurely due to a package in requirements that could not be found. this left things in limbo, stuck in the temp-like "build" folder before having a chance to complete the process which gets them into the proper "site-packages" location. | 1 | 4 | 0 | 0 | i am setting up a virtualenv for django deployment. i want an isolated env without access to the global site-packages. i used the option --no-site-packages, then installed a local pip instance for that env.
after using pip and a requirements.txt file i noticed that most packages were installed in a "build" folder that is not in sys.path so i am getting an error such as
"no module named django.conf"
i also installed virtualenvwrapper after the base virtualenv package.
as far i as i can recall i have not seen a "build" folder before, and am curious why these packages weren't simply installed in my local env's site-packages folder. how should i go about pointing to that build folder and why does it exist?
thanks | virtualenv, sys.path and site-packages | 1 | 1.2 | 1 | 0 | 0 | 1,443 |
3,479,728 | 2010-08-13T18:35:00.000 | 3 | 0 | 0 | 1 | 0 | python,security,bash,scripting,embedding | 0 | 3,479,760 | 0 | 7 | 0 | false | 0 | 0 | It always better and better style to use Python functions to do this kind of stuff. With Python it's not that hard to write a script in an OS-independent way instead of using bash. | 3 | 8 | 0 | 0 | I was wondering whether or not it is considered a good style to call bash commands within a Python script using os.system(). I was also wondering whether or not it is safe to do so as well.
I know how to implement some of the functionality I need in Bash and in Python, but it is much simpler and more intuitive to implement it in Bash. However, I feel like it is very hackish to write os.system("bash code").
Specifically, I want to move all files that end with a certain extension to a directory.
In bash: *mv .ext /path/to/destination
In Python (Pseudocode):
for file in directory:
if file.endswith("ext"):
move file to destination
In this case, what should I do? | Is it good style to call bash commands within a Python script using os.system("bash code")? | 0 | 0.085505 | 1 | 0 | 0 | 3,091 |
3,479,728 | 2010-08-13T18:35:00.000 | 1 | 0 | 0 | 1 | 0 | python,security,bash,scripting,embedding | 0 | 3,479,763 | 0 | 7 | 0 | false | 0 | 0 | It's not idea, since it makes your script a lot less portable. A native python script can run on any unix or windows machine that has the proper python libraries installed. When you add shell commands into the mix, you break that, and suddenly are locked down to a much narrower subset.
Sometimes you don't have a choice, but if it's something as simple as that, writing the code natively in python would make a lot more sense, and also be faster to boot (since the python process won't have to spawn a new shell just to execute the one command). | 3 | 8 | 0 | 0 | I was wondering whether or not it is considered a good style to call bash commands within a Python script using os.system(). I was also wondering whether or not it is safe to do so as well.
I know how to implement some of the functionality I need in Bash and in Python, but it is much simpler and more intuitive to implement it in Bash. However, I feel like it is very hackish to write os.system("bash code").
Specifically, I want to move all files that end with a certain extension to a directory.
In bash: *mv .ext /path/to/destination
In Python (Pseudocode):
for file in directory:
if file.endswith("ext"):
move file to destination
In this case, what should I do? | Is it good style to call bash commands within a Python script using os.system("bash code")? | 0 | 0.028564 | 1 | 0 | 0 | 3,091 |
3,479,728 | 2010-08-13T18:35:00.000 | 1 | 0 | 0 | 1 | 0 | python,security,bash,scripting,embedding | 0 | 3,479,838 | 0 | 7 | 0 | false | 0 | 0 | The quoting issues alone suggest that a pure Python solution is preferable. | 3 | 8 | 0 | 0 | I was wondering whether or not it is considered a good style to call bash commands within a Python script using os.system(). I was also wondering whether or not it is safe to do so as well.
I know how to implement some of the functionality I need in Bash and in Python, but it is much simpler and more intuitive to implement it in Bash. However, I feel like it is very hackish to write os.system("bash code").
Specifically, I want to move all files that end with a certain extension to a directory.
In bash: *mv .ext /path/to/destination
In Python (Pseudocode):
for file in directory:
if file.endswith("ext"):
move file to destination
In this case, what should I do? | Is it good style to call bash commands within a Python script using os.system("bash code")? | 0 | 0.028564 | 1 | 0 | 0 | 3,091 |
3,483,675 | 2010-08-14T14:11:00.000 | 0 | 0 | 0 | 0 | 0 | python,event-handling,wxpython | 0 | 41,389,878 | 0 | 2 | 0 | false | 0 | 1 | In the __init__( ) for your main frame put this:
wx.CallAfter( func_name ) | 2 | 0 | 0 | 0 | I'm working on a GUI program in which I already bind a start button with one event, and when I click the start button, the event runs as I like. My question is, if I want my program to start the event immediately after the GUI program starts, which means the start button is immediately being "clicked" once the program starts, how do I do it? | How to make a event run immediately after a GUI program starts in wxpython? | 0 | 0 | 1 | 0 | 0 | 205 |
3,483,675 | 2010-08-14T14:11:00.000 | 1 | 0 | 0 | 0 | 0 | python,event-handling,wxpython | 0 | 3,483,688 | 0 | 2 | 0 | true | 0 | 1 | In the main frame constructor set a one-shot timer with interval 0 that fires the event. | 2 | 0 | 0 | 0 | I'm working on a GUI program in which I already bind a start button with one event, and when I click the start button, the event runs as I like. My question is, if I want my program to start the event immediately after the GUI program starts, which means the start button is immediately being "clicked" once the program starts, how do I do it? | How to make a event run immediately after a GUI program starts in wxpython? | 0 | 1.2 | 1 | 0 | 0 | 205 |
3,486,384 | 2010-08-15T05:54:00.000 | 3 | 0 | 1 | 0 | 0 | python | 0 | 46,546,045 | 0 | 8 | 0 | false | 0 | 0 | Most of previous examples will raise an exception in case your string is not long enough.
Another approach is to use
'yourstring'.ljust(100)[:100].strip().
This will give you first 100 chars.
You might get a shorter string in case your string last chars are spaces. | 1 | 121 | 0 | 0 | Can seem to find a substring function in python.
Say I want to output the first 100 characters in a string, how can I do this?
I want to do it safely also, meaning if the string is 50 characters it shouldn't fail. | Output first 100 characters in a string | 0 | 0.07486 | 1 | 0 | 0 | 174,305 |
3,487,507 | 2010-08-15T13:16:00.000 | 0 | 1 | 1 | 0 | 0 | python,unit-testing,readability | 1 | 3,488,720 | 0 | 3 | 0 | false | 0 | 0 | It feels like there maybe some room for breaking your method into smaller pieces. Ones focused on dealing with parsing input and formatting output, could be separate from the actual clustering logic. This way tests around your clustering methods would be fewer and dealing with easily understood and testable data structures like dicts and lists. | 2 | 4 | 0 | 0 | I have a function that performs a hierarchical clustering on a list of input vectors. The return value is the root element of an object hierarchy, where each object represents a cluster. I want to test the following things:
Does each cluster contain the correct elements (and maybe other properties as well)?
Does each cluster point to the correct children?
Does each cluster point to the correct parent?
I have two problems here. First, how do I specify the expected output in a readable format. Second, how do I write a test-assertion accepts isomorphic variants of the expected data I provide? Suppose one cluster in the expected hierarchy has two children, A and B. Now suppose that cluster is represented by an object with the properties child1 and child2. I do not care whether child1 corresponds to cluster A or B, just that it corresponds to one of them, and that child2 corresponds to the other. The solution should be somewhat general because I will write several tests with different input data.
Actually my main problem here is to find a way to specify the expected output in a readable and understandable way. Any suggestions? | Writing unittests for a function that returns a hierarchy of objects | 1 | 0 | 1 | 0 | 0 | 72 |
3,487,507 | 2010-08-15T13:16:00.000 | 2 | 1 | 1 | 0 | 0 | python,unit-testing,readability | 1 | 3,487,617 | 0 | 3 | 0 | true | 0 | 0 | If there are isomorphic results, you should probably have a predicate that can test for logical equivalence. This would likely be good for your code unit as well as helping to implement the unit test.
This is the core of Manoj Govindan's answer without the string intermediates and since you aren't interested in string intermediates (presumably) then adding them to the test regime would be an unnecessary source of error.
As to the readability issue, you'd need to show what you consider unreadable for a proper answer to be given. Perhaps the equivalence predicate will obviate this. | 2 | 4 | 0 | 0 | I have a function that performs a hierarchical clustering on a list of input vectors. The return value is the root element of an object hierarchy, where each object represents a cluster. I want to test the following things:
Does each cluster contain the correct elements (and maybe other properties as well)?
Does each cluster point to the correct children?
Does each cluster point to the correct parent?
I have two problems here. First, how do I specify the expected output in a readable format. Second, how do I write a test-assertion accepts isomorphic variants of the expected data I provide? Suppose one cluster in the expected hierarchy has two children, A and B. Now suppose that cluster is represented by an object with the properties child1 and child2. I do not care whether child1 corresponds to cluster A or B, just that it corresponds to one of them, and that child2 corresponds to the other. The solution should be somewhat general because I will write several tests with different input data.
Actually my main problem here is to find a way to specify the expected output in a readable and understandable way. Any suggestions? | Writing unittests for a function that returns a hierarchy of objects | 1 | 1.2 | 1 | 0 | 0 | 72 |
3,489,183 | 2010-08-15T20:47:00.000 | 0 | 0 | 1 | 0 | 0 | python,timezone | 0 | 71,177,623 | 0 | 8 | 0 | false | 0 | 0 | Working with the latest version of tzlocal which is 4.1 as of today, tzlocal.get_localzone().key produces the following error: AttributeError: '_PytzShimTimezone' object has no attribute 'key'. But tzlocal.get_localzone().zone works lovely. | 1 | 24 | 0 | 0 | In a Python project I'm working on, I'd like to be able to get a "human-readable" timezone name of the form America/New_York, corresponding to the system local timezone, to display to the user. Every piece of code I've seen that accesses timezone information only returns either a numeric offset (-0400) or a letter code (EDT) or sometimes both. Is there some Python library that can access this information, or if not that, convert the offset/letter code into a human-readable name?
If there's more than one human-readable name corresponding to a particular timezone, either a list of the possible results or any one of them is fine, and if there is no human-readable name corresponding to the current time zone, I'll take either an exception or None or [] or whatever.
A clarification: I don't remember exactly what I had in mind when I originally wrote this question, but I think what I really wanted was a way to turn a timezone into a human-readable name. I don't think this question was meant to focus on how to get the system local timezone specifically, but for the specific use case I had in mind, it just happened that the local timezone was the one I wanted the name for. I'm not editing the bit about the local timezone out of the question because there are answers focusing on both aspects. | How can I get a human-readable timezone name in Python? | 0 | 0 | 1 | 0 | 0 | 22,635 |
3,489,520 | 2010-08-15T22:25:00.000 | 0 | 0 | 0 | 0 | 0 | python,gtk | 0 | 3,489,566 | 0 | 3 | 0 | false | 0 | 1 | Given the widget w, what does w.get_name() return? If None, that means the widget has no name property. Maybe you want gtk.glade.get_widget_name(w) instead? (I'm not sure if the name property of the widget and the name for it in the Glade XML from which it was created are the same thing...). | 1 | 10 | 0 | 0 | How do I get a widget's "name"?
When I define a GUI using Glade, I can "name" the widgets of the window but how do I recover that property when I have a widget object instance?
I've tried get_property(), get_name() and $widget.name to no avail.
Update: I am using GtkBuilder file format (i.e. XML format).
Resolution: a fix I have used: use the set_property("name", name) method on the widget just after getting it from GtkBuilder. | Python GTK+ widget name | 0 | 0 | 1 | 0 | 0 | 4,906 |
3,493,244 | 2010-08-16T12:51:00.000 | 0 | 0 | 0 | 0 | 0 | python,mobile-website,turbogears | 0 | 3,562,868 | 0 | 4 | 0 | false | 1 | 0 | The simplest version of a "mobile site" is simply CSS. Display a simplified version of the site to USERAGENTS that are identified as mobile. | 1 | 1 | 0 | 0 | Is it possible to develop mobile versions of webpages using Turbogears? Can someone please show me an example and how it is done? | Can I use Turbogears to develop mobile sites? | 1 | 0 | 1 | 0 | 0 | 254 |
3,498,587 | 2010-08-17T01:00:00.000 | 2 | 0 | 1 | 1 | 0 | python,file | 0 | 3,498,742 | 0 | 2 | 0 | true | 0 | 0 | You can specify the path to the file in either a complete way (e.g. 'c:/wher/ever/the.txt'), also known as "absolute" because it's taken exactly as you specify it, or a partial one (e.g., just "the.txt", or "ever/the.txt", or "../ever/the.txt", and so on), also known as "relative" because it's taken relatively to the current working directory of your process. If you don't know that working directory, an absolute path is usually simplest to find and specify.
So, find out where the file lives (e.g. c:/wher/ever) and use that absolute path (with "rightside up slashes", instead of windows-style backslashes, as I just explained in another answer) to open the file in question. | 1 | 2 | 0 | 0 | I'm trying to open a file with Python, but I'm unsure how to find the correct filename to use. | How do you find the filename that you pass to open()? | 0 | 1.2 | 1 | 0 | 0 | 965 |
3,498,904 | 2010-08-17T02:28:00.000 | 0 | 0 | 1 | 0 | 0 | python,windows,validation | 0 | 3,498,920 | 0 | 2 | 0 | false | 0 | 0 | I would really urge you not to do this. As you said, whatever you do will be broken, and you may actually cause more copies of your software to be pirated by including this barrier. Asking your users nicely not to steal may do better...
That said, implementing this in a way that discourages the most casual piracy is easy: just have the program send a serial number encrypted with the server's public key to your validation script, and have the server return a version of the number encrypted using its private key. Instant validation. Yes, this server could be written in Python easily. | 2 | 0 | 0 | 0 | I have been working on a huge project for work for a while now, and it is almost done. However, in an effort to prevent the program was being pirated (I already know there is pretty much no method that can't be cracked ), the software needs to be able to validate. I'm not exactly sure how to do this. Could some sort of software validation server be written in Python? How would the software communicate with the server? Would the softwre check each time it is launched to see if it is valid? The program requires internet access to run anyway, so checking for validation at each launch might not be so bad.
I am programming in Python 2.6 on Windows 7. Any help would be great! | Software Validation Server in Python? | 0 | 0 | 1 | 0 | 0 | 228 |
3,498,904 | 2010-08-17T02:28:00.000 | 2 | 0 | 1 | 0 | 0 | python,windows,validation | 0 | 3,498,935 | 0 | 2 | 0 | true | 0 | 0 | The software, when starting, should launch an https (so it can't just be sniffed easily;-) request to your server, identifying itself (however it is that you choose to identify, e.g. a serial number or whatever), and the server's response will tell it what to do (run normally, or terminate, or ask the user to register -- whatever).
Of course, any competent hacker will find and disable the part of your code where you're sending the request and dispatching on the answer, but then you already do know that everything can easily be cracked;-).
A less-easily crackable approach would be to keep some crucial part of the functionality on your server, so that the client's basically useless (or at least less useful) if it hasn't checked in with your server and obtained a token to be used in other "functionality requests" during a session.
Hard to tell, without knowing a lot more about your app, if there are bits and pieces of functionality in your app that lend themselves well to this treatment, but for example you could delegate in this way any kind of cryptographic functionality (encrypting, decrypting, signing, ...) -- if only your server knows the secret/private keys to be used for such purposes, and only performs the functionality for application sessions that have properly registered and been authorized, suddenly it's become very hard for even a good hacker to work around your registration and authorization system. | 2 | 0 | 0 | 0 | I have been working on a huge project for work for a while now, and it is almost done. However, in an effort to prevent the program was being pirated (I already know there is pretty much no method that can't be cracked ), the software needs to be able to validate. I'm not exactly sure how to do this. Could some sort of software validation server be written in Python? How would the software communicate with the server? Would the softwre check each time it is launched to see if it is valid? The program requires internet access to run anyway, so checking for validation at each launch might not be so bad.
I am programming in Python 2.6 on Windows 7. Any help would be great! | Software Validation Server in Python? | 0 | 1.2 | 1 | 0 | 0 | 228 |
3,501,215 | 2010-08-17T09:51:00.000 | 0 | 0 | 0 | 0 | 0 | python,opengl,svg,cairo,rsvg | 0 | 37,703,846 | 0 | 3 | 1 | false | 0 | 1 | I had to do the same (changing element color for instance), and had to modify rsvg library because all those nice features exist but they are hidden. You have to make a new interface to link to the nice features. | 1 | 3 | 0 | 0 | I render a huge SVG file with a lot of elements with Cairo, OpenGL and rsvg. I draw svg on cairo surface via rsvg and create an OpenGL texture to draw it. Everything is fine. And now I have to interact with elements from SVG. For example, I want to guess an element by coordinates. And I want to change the background of some path in SVG. In the case of changing background I think, I can change SVG DOM and somehow re-render a part of SVG. But in the case of hit testing elements I'm totally embarrassed.
So, is there some python library to interact with SVG? Is it possible to stay with cairo and rsvg and how can I implement it myself? Or is there a better way to render SVG in OpenGL and interact with it in python? All I want is load SVG, manipulate its DOM and render it | SVG interaction in python with cairo, opengl and rsvg | 1 | 0 | 1 | 0 | 0 | 3,978 |
3,504,522 | 2010-08-17T16:05:00.000 | 2 | 0 | 0 | 0 | 0 | python,image,pyqt,selection,pixel | 0 | 3,543,483 | 0 | 3 | 0 | false | 0 | 1 | First you have to draw the image. You can do this my making a QLabel widget and call setPixmap. You need to convert your QImage to QPixmap before doing this (you can use QPixmap.fromImage(img)).
You can get mouse clicks by subclassing the QImage and intercepting mousePressEvent. Look up the pixel value with QImage.pixel(). | 1 | 9 | 0 | 0 | I would like to know how i can select a pixel with a mouse click in an image (QImge) and get pixel position and value.
Thanks | Pyqt get pixel position and value when mouse click on the image | 0 | 0.132549 | 1 | 0 | 0 | 19,296 |
3,507,451 | 2010-08-17T22:22:00.000 | 0 | 0 | 1 | 0 | 0 | python,multithreading,r | 0 | 3,507,504 | 0 | 6 | 0 | false | 0 | 0 | If I remember correctly (but I might be wrong here) one of the main purposes of Ada95 was parallel processing. Funny language, that was.
Jokes aside I'm not quite sure how good performance wise it would be (but seeing you are using Python now then it shouldn't be that bad) but I'd suggest Java since the basics of multithreading are quite simple there (but making a well written, complex multithreaded application is rather hard). Heard the Concurrency library is also quite nice, I haven't tried it out myself yet, though. | 2 | 6 | 0 | 0 | Right now, I use a combination of Python and R for all of my data processing needs. However, some of my datasets are incredibly large and would benefit strongly from multithreaded processing.
For example, if there are two steps that each have to performed on a set of several millions of data points, I would like to be able to start the second step while the first step is still being run, using the part of the data that has already been processed through the first step.
From my understanding, neither Python nor R is the ideal language for this type of work (at least, I don't know how to implement it in either language). What would be the best language/implementation for this type of data processing? | Recommended language for multithreaded data work | 0 | 0 | 1 | 0 | 0 | 657 |
3,507,451 | 2010-08-17T22:22:00.000 | 1 | 0 | 1 | 0 | 0 | python,multithreading,r | 0 | 3,507,522 | 0 | 6 | 0 | false | 0 | 0 | On the Python side, your best bet is probably to separate the two steps in two different processes. There are a couple of modules that help you to achieve that. You would couple the two processes through pipes. In order to pass arbitrary data through the pipe, you need to serialize and deserialize it. The pickle module would be a good candidate for this.
If you want to jump ship, languages like Erlang, Haskell, Scala or Clojure have probably the concurrency features you are looking for, but I don't know how well they would integrate with R or some other statistical package that suits you. | 2 | 6 | 0 | 0 | Right now, I use a combination of Python and R for all of my data processing needs. However, some of my datasets are incredibly large and would benefit strongly from multithreaded processing.
For example, if there are two steps that each have to performed on a set of several millions of data points, I would like to be able to start the second step while the first step is still being run, using the part of the data that has already been processed through the first step.
From my understanding, neither Python nor R is the ideal language for this type of work (at least, I don't know how to implement it in either language). What would be the best language/implementation for this type of data processing? | Recommended language for multithreaded data work | 0 | 0.033321 | 1 | 0 | 0 | 657 |
3,507,732 | 2010-08-17T23:20:00.000 | 3 | 1 | 0 | 0 | 0 | python,arduino | 0 | 3,507,854 | 0 | 3 | 0 | false | 0 | 0 | Encode them into binary strings with Python's struct module. I don't know if arduino wants them little-endian or big-endian, but, if its docs aren't clear about this, a little experiment should easily settle the question;-). | 1 | 1 | 0 | 0 | I need to send integers greater than 255? Does anyone know how to do this? | Sending integer values to Arduino from PySerial | 0 | 0.197375 | 1 | 0 | 0 | 14,924 |
3,516,560 | 2010-08-18T20:49:00.000 | 1 | 0 | 1 | 0 | 0 | python,c | 0 | 6,150,403 | 0 | 7 | 0 | false | 0 | 0 | As someone who has worked with Java for over 12 years, I found that picking up a problem and solving it in a new language is the best way to learn. I don't believe in reading - it wastes a huge amount of time, and you can easily end up reading for too long.
My advice is to find a problem and set off to solve it with Python. You will learn alot in the process.
Good luck | 3 | 18 | 0 | 1 | I've got a good grasp on C, my first programming language. I know a reasonable number of tricks and techniques and have written quite a few programs, mostly for scientific stuff. Now I'd like to branch out and understand OOP, and Python seems like a good direction to go.
I've seen several questions on how to learn Python, but most of them were from folks who were looking to start programming for the first time. I don't need a tutorial that will tell me what a string is, but I do need one that can tell me how to make a string in Python. Any help on some good sources to look through? Bonus points if the source is free :) | Coming from C, how should I learn Python? | 0 | 0.028564 | 1 | 0 | 0 | 22,778 |
3,516,560 | 2010-08-18T20:49:00.000 | 1 | 0 | 1 | 0 | 0 | python,c | 0 | 3,517,315 | 0 | 7 | 0 | false | 0 | 0 | Diveintopython, official docs, "Learning python" by Mark Lutz(4th edition) is one of the best books. | 3 | 18 | 0 | 1 | I've got a good grasp on C, my first programming language. I know a reasonable number of tricks and techniques and have written quite a few programs, mostly for scientific stuff. Now I'd like to branch out and understand OOP, and Python seems like a good direction to go.
I've seen several questions on how to learn Python, but most of them were from folks who were looking to start programming for the first time. I don't need a tutorial that will tell me what a string is, but I do need one that can tell me how to make a string in Python. Any help on some good sources to look through? Bonus points if the source is free :) | Coming from C, how should I learn Python? | 0 | 0.028564 | 1 | 0 | 0 | 22,778 |
3,516,560 | 2010-08-18T20:49:00.000 | 32 | 0 | 1 | 0 | 0 | python,c | 0 | 3,516,905 | 0 | 7 | 0 | true | 0 | 0 | I knew C before I knew Python. No offence intended, but I don't think that your C knowledge is that big a deal. Unless you read very, very slowly, just set out to learn Python. It won't take that long to skim through the material you're familiar with, and it's not as if a Python tutorial aimed at C programmers will make you a better Python programmer - it might teach you things in a different order, is all, and raise some specific things that you would do in C but that you should not do in Python.
Strings in Python actually are somewhat different from strings in C, and they're used differently. I strongly recommend learning them "from scratch", rather than thinking about them in terms of their differences from C strings. For one thing, in Python 2 it's best not to use Python's "string" class to represent strings: there's a separate unicode string class and for practical Python apps (pretty much anything involving user data), you need that. (Python 3 fixes this, making the str class a unicode string). You need to establish a good working practice for unicode/byte data and decode/encode.
A common mistake when learning a second programming language, is to think "I know how to program, I just need to translate what I do in C into Python". No, you don't. While it's true that an algorithm can be basically the same in different languages, the natural way to do a particular thing can be completely different in different languages. You will write better Python code if you learn to use Python idiomatically, than if you try to write Python like a C programmer. Many of the "tricks" you know that make sense in C will be either pointless or counter-productive in Python. Conversely many things that you should do happily in a typical Python program, like allocating and freeing a lot of memory, are things that in C you've probably learned to think twice about. Partly because the typical C program has different restrictions from the typical Python program, and partly because you just have to write more code and think harder to get that kind of thing right in C than you do in Python.
If you're learning the language because you urgently need to program a system/platform which has Python but doesn't have C, then writing Python programs that work like C programs is a reasonable interim measure. But that probably doesn't apply to you, and even if it did it's not the ultimate goal.
One thing you might be interested to look at because of your C experience, is the Python/C API. Python is great for many things, but it doesn't result in the fastest possible computational core of scientific apps [neither does C, probably, but let's not go into FORTRAN for now ;-)]. So if you're aiming to continue with scientific programming through your move in Python, and your programs are typically memory-bus- and CPU-bound doing immense amounts of number-crunching (billions of ops), then you might like to know how to escape into C if you ever need to. Consider it a last resort, though.
You do need to understand Python reasonably well before the Python/C API makes much sense, though.
Oh yes, and if you want to understand OOP in general, remember later on to take a look at something like Java, Objective-C, C++, or D. Python isn't just an OO language, it's a dynamic OO language. You might not realise it from comparing just C with Python, but dynamic vs static types is a completely independent issue from the OOP-ness of Python. Python objects are like hashtables that allow you to attach new fields willy-nilly, but objects in many other OO languages store data in ways which are much more like a C struct. | 3 | 18 | 0 | 1 | I've got a good grasp on C, my first programming language. I know a reasonable number of tricks and techniques and have written quite a few programs, mostly for scientific stuff. Now I'd like to branch out and understand OOP, and Python seems like a good direction to go.
I've seen several questions on how to learn Python, but most of them were from folks who were looking to start programming for the first time. I don't need a tutorial that will tell me what a string is, but I do need one that can tell me how to make a string in Python. Any help on some good sources to look through? Bonus points if the source is free :) | Coming from C, how should I learn Python? | 0 | 1.2 | 1 | 0 | 0 | 22,778 |
3,517,841 | 2010-08-19T00:33:00.000 | 1 | 0 | 0 | 0 | 0 | python,qt,networking,pyqt,thin | 0 | 3,517,886 | 0 | 2 | 0 | true | 0 | 1 | Your desire to send "app logic" from the server to the client without sending "code" is inherently self-contradictory, though you may not realize that yet -- even if the "logic" you're sending is in some simplified ad-hoc "language" (which you don't even think of as a language;-), to all intents and purposes your Python code will be interpreting that language and thereby execute that code. You may "sandbox" things to some extent, but in the end, that's what you're doing.
To avoid hijackings and other tricks, instead, use HTTPS and validate the server's cert in your client: that will protect you from all the problems you're worrying about (if somebody can edit the app enough to defeat the HTTPS cert validation, they can edit it enough to make it run whatever code they want, without any need to send that code from a server;-).
Once you're using https, having the server send Python modules (in source form if you need to support multiple Python versions on the clients, else bytecode is fine) and the client thereby save them to disk and import / reload them, will be just fine. You'll basically be doing a variant of the classic "plugins architecture" where the "plugins" are in fact being sent from the server (instead of being found on disk in a given location). | 1 | 0 | 0 | 0 | Here is what I would like to do, and I want to know how some people with experience in this field do this:
With three POST requests I get from the http server:
widgets and layout
and then app logic (minimal)
data
Or maybe it's better to combine the first two or all three. I'm thinking of using pyqt. I think I can load .ui files. I can parse json data. I just think it would be rather dangerous to pass code over a network to be executed on the client. If someone can hijack the connection, or can change the apps setting to access a bogus server, that is nasty.
I want to do it this way because it keeps all the clients up-to-date. It's sort of like a webapp but simpler because of Qt. Essentially the "thin" app is just a minimal compiled python file that loads data from a server.
How can I do this without introducing security issues on the client? Is https good enough? Is there a way to get pyqt to run in a sandbox of sorts?
PS. I'm not stuck on Qt or python. I do like the concept though. I don't really want to use Java - server or client side. | how to implement thin client app with pyqt | 0 | 1.2 | 1 | 0 | 1 | 1,647 |
3,540,288 | 2010-08-22T05:23:00.000 | 1 | 0 | 1 | 0 | 0 | python | 0 | 3,540,307 | 0 | 11 | 0 | false | 0 | 0 | Seek to a random position, read a line and discard it, then read another line. The distribution of lines won't be normal, but that doesn't always matter. | 1 | 51 | 0 | 0 | Is there a built-in method to do it? If not how can I do this without costing too much overhead? | How do I read a random line from one file? | 0 | 0.01818 | 1 | 0 | 0 | 98,440 |
3,552,928 | 2010-08-24T01:22:00.000 | 3 | 1 | 0 | 0 | 0 | python,timeout,mechanize | 0 | 3,553,063 | 0 | 3 | 0 | false | 0 | 0 | If you're using Python 2.6 or better, and a correspondingly updated version of mechanize, mechanize.urlopen should accept a timeout=... optional argument which seems to be what you're looking for. | 1 | 15 | 0 | 0 | How do i set a timeout value for python's mechanize? | how do i set a timeout value for python's mechanize? | 0 | 0.197375 | 1 | 0 | 0 | 9,833 |
3,556,027 | 2010-08-24T11:41:00.000 | 0 | 1 | 0 | 1 | 0 | python,user-interface,bash | 0 | 3,556,046 | 0 | 4 | 0 | false | 0 | 0 | basically, all bash does is start other programs (and do symbolic math on the command line). So no, you're going to have to involve some other program. | 1 | 3 | 0 | 0 | I have some bash scripts, some simple ones to copy, search, write lines to files and so on.
I am an Ubuntu. and I've searched in google, but it seems that everybody is doing that on python.
I could do these on python, but since I am not a python programmer, I just know the basics.
I have no idea of how calling a sh script from a GUI written on python.
If someone has a link or something to say, please drop a line.
regards,
Mario | Is there a way of having a GUI for bash scripts? | 0 | 0 | 1 | 0 | 0 | 2,093 |
3,557,949 | 2010-08-24T15:11:00.000 | 0 | 0 | 1 | 1 | 0 | python,python-install | 0 | 3,558,004 | 0 | 2 | 0 | false | 0 | 0 | There has to be a way, but what some people do is provide batch files that set up the environment before invoking Python. That's what BZR does, anyway. If you can write that batch file somewhere that's already normally in the path, so much the better.
If you're just worried about invoking Python, the normal Python installer does file associations, so you can work it that way. | 1 | 1 | 0 | 0 | I'm creating one-click python installer (integrated with my application). Is there any way to force Python MSI installer to add python's path to SYSTEM PATH variable?
I'm using MSI installer because it is very easy to specify (using command line) how it should interact with the user. | add Python path to PATH system variable automatically under Windows | 0 | 0 | 1 | 0 | 0 | 1,668 |
3,559,457 | 2010-08-24T17:55:00.000 | 1 | 1 | 1 | 0 | 0 | python,multithreading,tornado,gil | 0 | 3,562,109 | 0 | 1 | 0 | false | 0 | 0 | The first thing I would check for would be to ensure that you're properly exiting threads. It's very hard to figure out what's going on with just your description to go from, but you use the word "monotonically," which implies that CPU use is tied to time rather than to load.
You may very well be running into threading limits of Python, but it should vary up and down with load (number of active threads,) and CPU usage (context switching costs) should reduce as those threads exit. Is there some reason for a thread, once created, to live forever? If that's the case, prioritize that rearchitecture. Otherwise, short term would be to figure out why CPU usage is tied to time and not load. It implies that each new thread has a permanent, irreversible cost in your system - meaning it never exits. | 1 | 8 | 0 | 0 | I'm just starting to work on a tornado application that is having some CPU issues. The CPU time will monotonically grow as time goes by, maxing out the CPU at 100%. The system is currently designed to not block the main thread. If it needs to do something that blocks and asynchronous drivers aren't available, it will spawn another thread to do the blocking operation.
Thus we have the main thread being almost totally CPU-bound and a bunch of other threads that are almost totally IO-bound. From what I've read, this seems to be the perfect way to run into problems with the GIL. Plus, my profiling shows that we're spending a lot of time waiting on signals (which I'm assuming is what __semwait_signal is doing), which is consistent with the effects the GIL would have in my limited understanding.
If I use sys.setcheckinterval to set the check interval to 300, the CPU growth slows down significantly. What I'm trying to determine is whether I should increase the check interval, leave it at 300, or be scared with upping it. After all, I notice that CPU performance gets better, but I'm a bit concerned that this will negatively impact the system's responsiveness.
Of course, the correct answer is probably that we need to rethink our architecture to take the GIL into account. But that isn't something that can be done immediately. So how do I determine the appropriate course of action to take in the short-term? | How do I determine the appropriate check interval? | 0 | 0.197375 | 1 | 0 | 0 | 765 |
3,568,371 | 2010-08-25T16:54:00.000 | 3 | 1 | 0 | 0 | 0 | python | 0 | 3,568,664 | 0 | 4 | 0 | false | 0 | 0 | You have a few options:
As Radomir mentioned, Cython might be a good choice: it's essentially a restricted Python with type declarations, automatically translated into C then compiled for execution.
If you want to use pure C, you can write a Python extension module using the Python C API. This is a good way to go if you need to manipulate Python data structures in your C code. Using the Python C API, you write in C, but with full access to the Python types and methods.
Or, you can write a pure C dll, then invoke it with ctypes. This is a good choice if you don't need any access to Python data structures in your C code. With this technique, your C code only deals with C types, and your Python code has to understand how to use ctypes to get at that C data. | 1 | 0 | 0 | 0 | i have prepared a project in python language ie a TEXT TO SPEECH synthesizer. Which took a total on 1500 lines of code.
But there few parts of code due to which it is taking so much time to run the code, i want to replace that parts of code in C/c++ lang so that it runs faster.
So i want to know how can i run these parts of code in C++ or improve its speed in any other way??
please suggest, | how to replicate parts of code in python into C to execution faster? | 0 | 0.148885 | 1 | 0 | 0 | 106 |
3,571,233 | 2010-08-26T00:22:00.000 | 2 | 0 | 0 | 0 | 0 | python,selenium,browser-automation | 0 | 3,573,288 | 0 | 3 | 0 | true | 1 | 0 | There's a Selenium.getHtmlSource() method in Java, most likely it is also available in Python. It returns the source of the current page as string, so you can do whatever you want with it | 1 | 3 | 0 | 1 | I'm not sure how to find this information, I have found a few tutorials so far about using Python with selenium but none have so much as touched on this.. I am able to run some basic test scripts through python that automate selenium but it just shows the browser window for a few seconds and then closes it.. I need to get the browser output into a string / variable (ideally) or at least save it to a file so that python can do other things on it (parse it, etc).. I would appreciate if anyone can point me towards resources on how to do this. Thanks | Selenium with Python, how do I get the page output after running a script? | 0 | 1.2 | 1 | 0 | 1 | 4,318 |
3,577,652 | 2010-08-26T17:18:00.000 | 2 | 0 | 0 | 0 | 0 | python,xml | 0 | 3,577,694 | 0 | 2 | 0 | false | 0 | 0 | BeautifulSoup is your best bet in this case. I suggest profiling before ruling out BeautifulSoup altogether. | 1 | 4 | 0 | 0 | A sever I can't influence sends very broken XML.
Specifically, a Unicode WHITE STAR would get encoded as UTF-8 (E2 98 86) and then translated using a Latin-1 to HTML entity table. What I get is â 98 86 (9 bytes) in a file that's declared as utf-8 with no DTD.
I couldn't configure W3C tidy in a way that doesn't garble this irreversibly. I only found how to make lxml skip it silently. SAX uses Expat, which cannot recover after encountering this. I'd like to avoid BeautifulSoup for speed reasons.
What else is there? | How to parse broken XML in Python? | 0 | 0.197375 | 1 | 0 | 1 | 1,950 |
3,586,071 | 2010-08-27T16:05:00.000 | 4 | 0 | 0 | 0 | 0 | python,user-interface,pygtk,gettext,glade | 0 | 3,588,790 | 0 | 1 | 0 | true | 0 | 1 | You should be able to create a *.pot file from a *.glade file using intltool-extract --type=gettext/glade foo.glade, and intltool supposedly knows what is translatable.
Also, I suggest you look into GtkBuilder if you didn't do that already (you can save GtkBuilder interface files from recent Glade 3 versions, and you won't need the extra libglade anymore). | 1 | 7 | 0 | 0 | I have made an application using Glade and Python and I would like to make several localizations.
I know how to localize strings that are in the Python code, I just encapsule all the strings that are supposed to be localized with _() and than specify the translation of the string in a .po file.
But how do I tell a string that is built with Glade that it should be localizable (for example labels, menu items, button labels, ...)?
I am using gettext for the localization.
Thank you, Tomas | Localization of GUI built with Glade and Python (Gtk) | 0 | 1.2 | 1 | 0 | 0 | 1,203 |
3,594,631 | 2010-08-29T12:04:00.000 | 0 | 0 | 1 | 0 | 0 | python,network-programming | 0 | 3,594,735 | 0 | 2 | 0 | true | 0 | 0 | To receive messages (e.g. the UDP package suggested by the other poster or an http request), the clients would have to run a basic server on the client machine. You could use the Python xmlrpc module for example. However, a local firewall may block the inward communication.
The easiest solution, if the number of clients is moderate, will be to frequently poll the database for changes: add a column "last modification time" to your drawing table and have the clients check this field. This way the clients can find out whether they need to reload the drawing without wasting too many resources.
Edit: The last modification field could either be actively updated by the client that made a change to the drawing, or automatically updated by a database trigger. | 2 | 1 | 0 | 0 | I am new to network programming but old to Python. I have a simple blotter program that is to be used on multiple client computers. The blotter works two ways, it can show and update the information in the database. To avoid any blotters showing old data, how can I make all blotters re-fetch information from the database as soon as another blotter has updated some data in the database?
I would rather like to avoid complexity in setting up some client-server protocol. Is it possible to create some form of client-only protocol where a simple refresh message is passed along straight to the other blotters when they need to update their information? | Keeping multiple clients showing up-to-date information in Python? | 1 | 1.2 | 1 | 0 | 0 | 177 |
3,594,631 | 2010-08-29T12:04:00.000 | 0 | 0 | 1 | 0 | 0 | python,network-programming | 0 | 3,594,712 | 0 | 2 | 0 | false | 0 | 0 | You could use triggers. When an information is updated send a signal (is up to you choose how, maybe just an udp packet) to all blotters that will update their information consequentially. Postgresql could be scripted using python. | 2 | 1 | 0 | 0 | I am new to network programming but old to Python. I have a simple blotter program that is to be used on multiple client computers. The blotter works two ways, it can show and update the information in the database. To avoid any blotters showing old data, how can I make all blotters re-fetch information from the database as soon as another blotter has updated some data in the database?
I would rather like to avoid complexity in setting up some client-server protocol. Is it possible to create some form of client-only protocol where a simple refresh message is passed along straight to the other blotters when they need to update their information? | Keeping multiple clients showing up-to-date information in Python? | 1 | 0 | 1 | 0 | 0 | 177 |
3,604,357 | 2010-08-30T21:28:00.000 | 0 | 0 | 1 | 0 | 0 | python,user-interface,gtk | 0 | 3,604,511 | 0 | 3 | 0 | false | 0 | 1 | You mean a widget to filter a large collection into multiple subsets / views?
I would guess you have to implement this yourself - a list of options on the left and filtered results on the right, I don't know of any existing (gtk) widgets. | 1 | 1 | 0 | 0 | I'm trying to write a simple GTD-style todo list app with python and gtk to learn python. I want a container that can select an individual list from a lot of choices. It would be something like the list of notebooks area in tomboy. Not a combobox.
As you can probably tell I'm a beginner and the terminology is probably off.
Can you please tell me what it is I'm looking for and an overview of how to implement it? | Python PyGTK. What's this component? | 0 | 0 | 1 | 0 | 0 | 256 |
3,606,743 | 2010-08-31T07:07:00.000 | 0 | 0 | 1 | 1 | 0 | python,google-app-engine,ssl | 0 | 3,606,827 | 0 | 3 | 0 | false | 0 | 0 | Why don't you provide the complete path to python executable. That should work.
C:\"Python2.5.2"\python.exe setup.py install | 1 | 1 | 0 | 0 | I'm running GAE SDK on a Windows Vista laptop. It keeps reminding me to install the SSL module. I've been having great difficulty on how to do that.
I've downloaded the SSL module.
I've done 'python setup.py install' in cmd, but it just says "python is not recognized as an internal..."
I've added C:\Python2.5.2 to my PATH.
Still the same message "python is not recognized as an internal or external command..."
What else should I do? | Installing Python SSL module on Windows Vista | 0 | 0 | 1 | 0 | 0 | 530 |
3,607,020 | 2010-08-31T07:46:00.000 | 3 | 0 | 1 | 0 | 0 | python,vba | 0 | 3,627,197 | 0 | 4 | 0 | false | 0 | 0 | It is matter of taste. If you use modules your 'program' will be more procedural oriented. If you choose classes it will be more or less object oriented. I'm working with Excel for couple of months and personally I choose classes whenever I can because it is more comfortable to me. If you stop thinking about objects and think of them as Components you can use them with elegance. The main reason why I prefer classes is that you can have it more that one. You can't have two instances of module. It allows me use encapsulation and better code reuse.
For example let's assume that you like to have some kind of logger, to log actions that were done by your program during execution. You can write a module for that. It can have for example a global variable indicating on which particular sheet logging will be done. But consider the following hypothetical situation: your client wants you to include some fancy report generation functionality in your program. You are smart so you figure out that you can use your logging code to prepare them. But you can't do log and report simultaneously by one module. And you can with two instances of logging Component without any changes in their code. | 4 | 5 | 0 | 0 | My first "serious" language was Java, so I have comprehended object-oriented programming in sense that elemental brick of program is a class.
Now I write on VBA and Python. There are module languages and I am feeling persistent discomfort: I don't know how should I decompose program in a modules/classes.
I understand that one module corresponds to one knowledge domain, one module should ba able to test separately...
Should I apprehend module as namespace(c++) only? | Module vs object-oriented programming in vba | 0 | 0.148885 | 1 | 0 | 0 | 4,745 |
3,607,020 | 2010-08-31T07:46:00.000 | 3 | 0 | 1 | 0 | 0 | python,vba | 0 | 3,607,773 | 0 | 4 | 0 | true | 0 | 0 | I don't do VBA but in python, modules are fundamental. As you say, the can be viewed as namespaces but they are also objects in their own right. They are not classes however, so you cannot inherit from them (at least not directly).
I find that it's a good rule to keep a module concerned with one domain area. The rule that I use for deciding if something is a module level function or a class method is to ask myself if it could meaningfully be used on any objects that satisfy the 'interface' that it's arguments take. If so, then I free it from a class hierarchy and make it a module level function. If its usefulness truly is restricted to a particular class hierarchy, then I make it a method.
If you need it work on all instances of a class hierarchy and you make it a module level function, just remember that all the the subclasses still need to implement the given interface with the given semantics. This is one of the tradeoffs of stepping away from methods: you can no longer make a slight modification and call super. On the other hand, if subclasses are likely to redefine the interface and its semantics, then maybe that particular class hierarchy isn't a very good abstraction and should be rethought. | 4 | 5 | 0 | 0 | My first "serious" language was Java, so I have comprehended object-oriented programming in sense that elemental brick of program is a class.
Now I write on VBA and Python. There are module languages and I am feeling persistent discomfort: I don't know how should I decompose program in a modules/classes.
I understand that one module corresponds to one knowledge domain, one module should ba able to test separately...
Should I apprehend module as namespace(c++) only? | Module vs object-oriented programming in vba | 0 | 1.2 | 1 | 0 | 0 | 4,745 |
3,607,020 | 2010-08-31T07:46:00.000 | 1 | 0 | 1 | 0 | 0 | python,vba | 0 | 3,607,379 | 0 | 4 | 0 | false | 0 | 0 | VBA also allows the use of classes. Unfortunately, those classes don't support all the features of a full-fleged object oriented language. Especially inheritance is not supported.
But you can work with interfaces, at least up to a certain degree.
I only used modules like "one module = one singleton". My modules contain "static" or even stateless methods. So in my opinion a VBa module is not namespace. More often a bunch of classes and modules would form a "namespace". I often create a new project (DLL, DVB or something similar) for such a "namespace". | 4 | 5 | 0 | 0 | My first "serious" language was Java, so I have comprehended object-oriented programming in sense that elemental brick of program is a class.
Now I write on VBA and Python. There are module languages and I am feeling persistent discomfort: I don't know how should I decompose program in a modules/classes.
I understand that one module corresponds to one knowledge domain, one module should ba able to test separately...
Should I apprehend module as namespace(c++) only? | Module vs object-oriented programming in vba | 0 | 0.049958 | 1 | 0 | 0 | 4,745 |
3,607,020 | 2010-08-31T07:46:00.000 | 1 | 0 | 1 | 0 | 0 | python,vba | 0 | 3,607,193 | 0 | 4 | 0 | false | 0 | 0 | Idioms of languages are different and thats the reason a problem solved in different languages take different approaches.
"C" is all about procedural decomposition.
Main idiom in Java is about "class or Object" decomposition. Functions are not absent, but they become a part of exhibited behavior of these classes.
"Python" provides support for both Class based problem decomposition as well as procedural based.
All of these uses files, packages or modules as concept for organizing large code pieces together. There is nothing that restricts you to have one module for one knowledge domain.
These are decomposition and organizing techniques and can be applied based on the problem at hand.
If you are comfortable with OO, you should be able to use it very well in Python. | 4 | 5 | 0 | 0 | My first "serious" language was Java, so I have comprehended object-oriented programming in sense that elemental brick of program is a class.
Now I write on VBA and Python. There are module languages and I am feeling persistent discomfort: I don't know how should I decompose program in a modules/classes.
I understand that one module corresponds to one knowledge domain, one module should ba able to test separately...
Should I apprehend module as namespace(c++) only? | Module vs object-oriented programming in vba | 0 | 0.049958 | 1 | 0 | 0 | 4,745 |
3,611,830 | 2010-08-31T17:59:00.000 | 0 | 0 | 0 | 1 | 0 | python,google-app-engine,memcached,python-memcached | 0 | 3,611,908 | 0 | 3 | 0 | false | 1 | 0 | as in comments above, I guess I could stick all data in a single memcache entry with a known key.
Still for non-static data there are scenarios where it would be useful. | 2 | 4 | 0 | 0 | I want to use all the data in my python app engine memcache. I do not know the keys in advance.
How do I go about getting all data? | how do I return all memcached values in Google App Engine? | 0 | 0 | 1 | 0 | 0 | 3,350 |
3,611,830 | 2010-08-31T17:59:00.000 | 1 | 0 | 0 | 1 | 0 | python,google-app-engine,memcached,python-memcached | 0 | 4,524,611 | 0 | 3 | 0 | false | 1 | 0 | I am using a 'well known key' called "config" where I store a list of all other keys and use that to enumerate the rest of the items. | 2 | 4 | 0 | 0 | I want to use all the data in my python app engine memcache. I do not know the keys in advance.
How do I go about getting all data? | how do I return all memcached values in Google App Engine? | 0 | 0.066568 | 1 | 0 | 0 | 3,350 |
3,612,410 | 2010-08-31T19:18:00.000 | 2 | 0 | 0 | 0 | 0 | python,python-3.x,gpu | 1 | 10,986,086 | 0 | 2 | 0 | false | 0 | 1 | Clyther is a Python package for High-Performance Computing (HPC) using, for example, video cards with multiple Graphics Packaging Units (GPUs) or (less frequently) multi-core processors. Clyther is for parallel processing of algorithms or data sets that would normally take a lot of time to process serially. Meaning, if you have a problem that can be split into many smaller problems, then Clyther is a useful package to use. Additionally, your problem must be something that can use numpy arrays.
Clyther is a nice package to use if you have the problem it is intended to solve. It makes it fairly easy to write Python code to run on multiple processes.
If that's not the problem you need to solve, then Clyther probably won't help you. | 2 | 2 | 0 | 0 | I don't get what Clyther is or how to use it.
My stuff:
ATI OpenCl SDK (just dl'd)
clyther beta (just dl'd)
windows 7 pro 64 bit
active python 3.1.2
Xfxs Ati radeon 5850 video card
I downloaded the ATI OpenCl SDK and the clyther beta from sourceforge. Then I tooke the sample 'reduce' function from the sourceforge documents and pasted the code into notepad and named it clythersample.py. When I double-click the file or open it in the interactiveshell, it gives an error message on the first line.
Is naming the file .py wrong? I guess clyther is its own lqnguage and not really python? Can I write python code and in the middle of the program, write a chunk of clyther code? Will python IDEs (esp. Wing understand and debug it?) Will it work with python 3 or do I need 2.6? Is 64 bit os ok?
(I'm not a programme or technically competent, so things like its a python API for OpenCl or it had C bindings for python don't mean a whole lot). | Clyther-how to get started? | 0 | 0.197375 | 1 | 0 | 0 | 507 |
3,612,410 | 2010-08-31T19:18:00.000 | 1 | 0 | 0 | 0 | 0 | python,python-3.x,gpu | 1 | 3,612,526 | 0 | 2 | 0 | false | 0 | 1 | When you name the file .py (the file extension associated with python.exe) and double-click it, how is windows supposed to know it's supposed to run the file with CLyther?
Is naming the file .py wrong? I guess clyther is its own lqnguage and not really python?
Documentation compares it with Cython - so I suppose it's an extension to the language, i.e. they take Python and bolt more features on it.
Can I write python code and in the middle of the program, write a chunk of clyther code?
From the goals of the project, it should (like Cython) ultimately be able to accept all or most Python code. So, yes - but of course you'd have to run the whole program with CLyther.
Will python IDEs (esp. Wing understand and debug it?)
Not natively, I suppose.
Side note: The project is in a very early stage of developement (very first beta-release), so don't expect things to run smoothly right now. | 2 | 2 | 0 | 0 | I don't get what Clyther is or how to use it.
My stuff:
ATI OpenCl SDK (just dl'd)
clyther beta (just dl'd)
windows 7 pro 64 bit
active python 3.1.2
Xfxs Ati radeon 5850 video card
I downloaded the ATI OpenCl SDK and the clyther beta from sourceforge. Then I tooke the sample 'reduce' function from the sourceforge documents and pasted the code into notepad and named it clythersample.py. When I double-click the file or open it in the interactiveshell, it gives an error message on the first line.
Is naming the file .py wrong? I guess clyther is its own lqnguage and not really python? Can I write python code and in the middle of the program, write a chunk of clyther code? Will python IDEs (esp. Wing understand and debug it?) Will it work with python 3 or do I need 2.6? Is 64 bit os ok?
(I'm not a programme or technically competent, so things like its a python API for OpenCl or it had C bindings for python don't mean a whole lot). | Clyther-how to get started? | 0 | 0.099668 | 1 | 0 | 0 | 507 |
3,614,609 | 2010-09-01T02:17:00.000 | 0 | 0 | 1 | 0 | 0 | python,macos,tkinter | 0 | 3,614,650 | 0 | 2 | 0 | false | 0 | 1 | If I'm not greatly mistaken, it should pass the name of the file as the first argument to the script - sys.argv[1]. | 1 | 0 | 0 | 0 | I have a python script bundled into a application (I'm on a mac) and have the application set to be able to open .zip files. But when I say "open foo.zip with bar.py" how do I access the file that I have passed to it?
Additional info:
Using tkinter.
What's a good way to debug this, as there is no terminal to pass info to? | Python: open a file *with* script? | 0 | 0 | 1 | 0 | 0 | 310 |
3,619,990 | 2010-09-01T16:04:00.000 | 2 | 0 | 1 | 0 | 0 | python,c,installation | 0 | 3,620,269 | 0 | 2 | 0 | true | 0 | 0 | You can avoid having some one to install it independently but you can not avoid installation completely. If his computing platform differs from yours, he will have to build the extension.
What can be done is that you setup a package distribution using distutils. This way the package could be installed or built. You can include the "C" extension in your package.
For some standard platform, you can then provide binary package distribution. The user should have the ability to rebuild, if the binary package is not working out for him. | 2 | 4 | 0 | 0 | I wrote a Python extension in C, and my python program uses that extension. In order for it to work, I would have to install the extension on the user's system before my program can run. Is there a way to bypass that installation step and somehow just have the extension in my python package? The only compiled part obviously is the extension (since it's in C). | Is there a way to package a python extension written in C into a binary so I don't have to python-install it? | 0 | 1.2 | 1 | 0 | 0 | 112 |
3,619,990 | 2010-09-01T16:04:00.000 | 1 | 0 | 1 | 0 | 0 | python,c,installation | 0 | 3,621,206 | 0 | 2 | 0 | false | 0 | 0 | just put the .d compiled python dll in the same directory as your python script. then you'll be able to import it. | 2 | 4 | 0 | 0 | I wrote a Python extension in C, and my python program uses that extension. In order for it to work, I would have to install the extension on the user's system before my program can run. Is there a way to bypass that installation step and somehow just have the extension in my python package? The only compiled part obviously is the extension (since it's in C). | Is there a way to package a python extension written in C into a binary so I don't have to python-install it? | 0 | 0.099668 | 1 | 0 | 0 | 112 |
3,630,774 | 2010-09-02T20:05:00.000 | 78 | 0 | 0 | 0 | 0 | python,logging | 0 | 3,630,800 | 0 | 5 | 0 | true | 0 | 0 | logger.handlers contains a list with all handlers of a logger. | 1 | 70 | 0 | 0 | How can I remove / inspect / modify handlers configured for my loggers using the fileConfig() function?
For removing there is Logger.removeHandler(hdlr) method, but how do I get the handler in first place if it was configured from file? | logging remove / inspect / modify handlers configured by fileConfig() | 0 | 1.2 | 1 | 0 | 1 | 46,204 |
3,632,046 | 2010-09-02T23:33:00.000 | 1 | 0 | 1 | 0 | 0 | python,import,zip | 0 | 3,632,086 | 0 | 1 | 0 | true | 0 | 0 | Just insert the whole path to the zipfile, c:/what/ever/itis.zip, in your sys.path, and import themodule (assuming it's at the top "level" of the zipfile's simulated directory-tree structure). | 1 | 0 | 0 | 0 | There is a module I'd love to download, but it is only available in a zip file, how do I get such a file to work properly in python, so That I can import what I want?
This is in Windows 7 BTW. | Getting modules from a zip file? | 0 | 1.2 | 1 | 0 | 0 | 112 |
3,640,092 | 2010-09-03T22:51:00.000 | 1 | 0 | 0 | 1 | 0 | python,ctypes | 0 | 3,640,616 | 0 | 2 | 0 | false | 0 | 0 | Be aware that the operating system is going to be doing readahead for read() anyway. You're going to be blocking either in read() or write()--one or the other will bottleneck the operation--but even though you're blocking in one, that doesn't mean the other isn't taking place for you behind the scenes. That's the job of every multitasking operating system.
If you use mmap for this, you're very likely making things more complicated for the OS--making it harder for it to determine that you're really just streaming data in and out, and making it more complicated for it to do read-ahead. It may still figure it out (operating systems are very good at this), but you're probably not helping.
The only benefit in principle is avoiding the cost of a memory copy, but it doesn't sound like that's your goal here (and unless profiling clearly says otherwise, I'd strongly doubt that would help performance). | 1 | 12 | 0 | 0 | I am wondering if it is possible for the ctypes package to interface with mmap.
Currently, my module allocates a buffer (with create_string_buffer) and then passes that using byref to my libraries mylib.read function. This, as the name suggests, reads data into the buffer. I then call file.write(buf.raw) to write the data to disk. My benchmarks, however, show this to be far from optimal (time spent in file.write is time better spent in mylib.read).
I am therefore interested in knowing if ctypes can interoperate with mmap. Given an mmap.mmap instance and an offset how can I get a pointer (c_void_p) into the address space? | Python, ctypes and mmap | 1 | 0.099668 | 1 | 0 | 0 | 3,930 |
3,641,538 | 2010-09-04T08:54:00.000 | 2 | 0 | 0 | 1 | 0 | python,google-app-engine | 0 | 3,643,164 | 0 | 3 | 0 | false | 0 | 0 | Just place the package's folder in the root directory of your GAE application, easy! | 1 | 2 | 0 | 0 | I understand that if you want to include external packages you have to include them in your project. So I was wondering how do you do this?
Do people use one general script that auto imports them from a location. Maybe some kind of config file that lists all the external packages? Do you always zip the packages and use zipimporter?
Anway, I guess I am looking for a good general strategy for import external packages. I learned some already from looking at source code but extra info/examples would be super. | Google App Engine: Including external packages | 0 | 0.132549 | 1 | 0 | 0 | 506 |
3,643,500 | 2010-09-04T18:35:00.000 | -3 | 0 | 1 | 1 | 0 | python,operating-system | 0 | 8,959,919 | 0 | 11 | 0 | false | 0 | 0 | Buddy, here is the answer you have been looking for:
Writting an Operating System is not different than writting any other application, actually it is far easier than writing any other code for the reason an Operating System is an ALL-PURPOSE software or what is meant as a platform... and you know it!.
All of the previous asnwers are EXTREMELY USEFUL!, and ALL OF THE PREVIOUS INCLUDING THIS ONE WILL HELP YOU IN CODING YOUR O.S. actually in less than three months.
Please, try to be objective and get rid of negative answers (that is just mindblocking...)
A Software Developer actually CODE EVERYTHING that comes to his mind! (in my case I was a SUPERB software developer until I had a brain accident and suffered hypoxia for a considerably period... not want to talk further about it... me traumatized...)...
Let's speak clear:
If you want to build an O.S. do the following and start TODAY!:
Define if you want to write a SHELL or if you want to write a CORE O.S.;
Plan main functions of the O.S., processes, etc.;
Choose the level you want to build it on:
VERY LOW LEVEL (Assembly Language required and MEMORY, CPU, AND HARDWARE RESOURCES KNOWLEDGE REQUIRED ALSO -NOT TO BE ACQUIRED IN MERELY THREE MONTHS... OH NO!...)...
Medium Level (Here you can use the STANDARD solution, that is C programming Language!);
High Level (This is the level you may want to use Python, it means you will use ALL of the same resources and shells you operating systems offer to you, whether it is any Linux Distribution, or a UNIX(R), Windows(R), CP/M(R) or any other known up to date);
Because of the time required for you to build it I must assume you are delivering a College work to earn credits... and yet in case you work for a Corporation or in case you are self employed or your own C.E.O., you must have resources assigned to this project... I will assume you are building it for a Academic's!.
Imagine you are writing a shell, that will ease the start-up of your work, and while you are writing the shell your mind should be drawing the real core of it, along with the addressing and along with the lowest level routines...
I think you may know MS(R)-DOS(R). The version 3.3 is one of the easiest and enriching (pedagogically speaking) Operating Systems ever designed and published by Microsoft(r) Corp. Please, be creative, DO NOT CLONE IT, just inspire your mind on it, and then build something your Professor or end-consumer will admire and enjoy!.
Do not forget we are in the age of Graphical User's Interface, so do not go into texting, although ASCII is still the most beautiful expression of computer age, you can play with both interfaces.
Once you work this from Top to Dowm you will find out how easy it is to build routines in High Level language, and once you build it, and debug it, may be you will speed up a CORE os. that is: Bootstrapping, Memory management, etcetera...
Do not get to involved in dealing with interruptions or you may end up loosing you enthusiasm INMEDIATELY!... leave the UNDERGROUND O.S. to deal and take care of the interruptions.
In less than three months you will have your first prototype, and then you need to make it work good (To Debug it, I mean!). Exceed yourself!.
If you work SOLO, you will need to write a manual, IT TAKES CONSIDERABLY PRECIOUS TIME YOU DO NOT WANT TO LOOSE... My advice (please, do not laugh, I used this technique and it made today's Magnate's earn BILLIONS) WRITE DOWN IN PAPER, HANDWRITTEN, ALL OF THE DOCUMENTATION (THIS IS BECAUSE YOUR FINE MOTRICE COORDINATION IS FASSST! AND EVEN IT WILL NOT EQUAL THE SPEED OF YOUR THOUGHTS IT IS A HARD COPY TO DELIVER TO A WELL PAID ASSISTANT TO TYPE IT INTO A COMPUTER AND EDIT IT MARVELOUS -MAYBE A .PDF WITH ILLUSTRATIONS, ALONG WITH A VIDEO WILL SHARPEN AND DELIGHT THE EYES OF THE END-CONSUMER!.
Remember, the build up of the first month must be actually a SHELL of the basic functions a BASIC operating system must deliver to the user:
Commands Processor;
File Directory listup;
Create/Edit and Delete files;
Create/Edit and Delete Directories;
Accessing drive units (floppies, Compact Discs, HardDrives, Flash Drives, etc...);
Update and Display of information through the screen!;
I would focus mainly in the previous, and then ANYTHING else comes up easily through the creation of enriching routines (trust me this phase is addictive and you will have NO MORE life when you reach to this poit for you will be married to this project and you will never leave it anymore), do not fear, it wil work!.
Present your Operating System, and if your expecting upcomming funds show up, or if your expecting grade gets the higher rated you expect, you may want to keep enlarging your project and then build it into a more solid, robust and steady application!.
Just imagine yourself using this platform as a plaintiff for any kind of hardware you may want to work with: ROBOTS, AUTOS; AIRPLANES; REMOTE CONTROL; ETC...
I know you will enjoy this assignment and I know you will entertain yourself greatly! Only a real programmer has this kind of ambitions!
God bless America!
KnowBuddy | 7 | 15 | 0 | 0 | I have been asked to choose a project for my Operating System course at my university. I was bubbled with the idea of making an Operating System from scratch in Python.
I have a few limitations:
I have only 3 months.
I want to do it in Python.
I can put in say 20-30 hours every week into it.
I want to know, how feasible is the idea? Like how far can I go in building the same. I would be very happy, if I can get a basic version running (something with a handful of very basic apps running.) Is it possible with the given limitations?
Is there a book that can help me like a guideline? (need not be for python, I just need a guide to tell me how I should go about making the OS)
If the idea is not feasible, can anyone tell me how much do I need to scale down my idea?
Any help is much appreciated! | Operating System from scratch | 1 | -0.054491 | 1 | 0 | 0 | 13,899 |
3,643,500 | 2010-09-04T18:35:00.000 | 16 | 0 | 1 | 1 | 0 | python,operating-system | 0 | 3,643,520 | 0 | 11 | 0 | false | 0 | 0 | Scale this down a lot. I would recommend looking at one very small piece of an operating system that you would want to do, perhaps parallel processing. There is no feasible way you will be able to write an entire operating system in under 500 hours, let only 5000 hours. The real question is is this for an undergraduate course or a graduate course? The answer to that will greatly reflect what is needed to pass.
Adding
Grab a book on a topic about the operating system that interests you and focus intently on that for 3 months and you may just produce something that is good. Operating systems may seem like they don't do much on the outside, but think of it this way Windows has ~50 million lines of code. | 7 | 15 | 0 | 0 | I have been asked to choose a project for my Operating System course at my university. I was bubbled with the idea of making an Operating System from scratch in Python.
I have a few limitations:
I have only 3 months.
I want to do it in Python.
I can put in say 20-30 hours every week into it.
I want to know, how feasible is the idea? Like how far can I go in building the same. I would be very happy, if I can get a basic version running (something with a handful of very basic apps running.) Is it possible with the given limitations?
Is there a book that can help me like a guideline? (need not be for python, I just need a guide to tell me how I should go about making the OS)
If the idea is not feasible, can anyone tell me how much do I need to scale down my idea?
Any help is much appreciated! | Operating System from scratch | 1 | 1 | 1 | 0 | 0 | 13,899 |
3,643,500 | 2010-09-04T18:35:00.000 | 9 | 0 | 1 | 1 | 0 | python,operating-system | 0 | 3,643,598 | 0 | 11 | 0 | false | 0 | 0 | Does your professor require a "low-level" component in the project? For example, anything that deals with the hardware or the instruction architecture. If so, your professor will not allow you to do the project in Python. The project must be written in C and assembly. And you will invariably be working on modifying the Linux kernel.
However, nowadays Operating System is no longer confined to the low-level aspect. Virtualization, database, parallelization are all built on top of the Operating System. If your professor is "old school" then he/she may not consider those new topics to be part of Operating System. So, you may need to bring some sample ideas to your professor and seek clarification.
Whether to go into low-level, as some have suggested, depends entirely on the professor's educational goals.
To teach basic concurrent programming constructs, such as events, semaphors and mutex. This can be taught by writing some multi-thread applications. It is arguably too easy as a goal for an OS class. Nevertheless, this is in fact the most "marketable" skill you will get from the class.
A variation on this theme is to teach how to "use" a particular flavor of OS API.
To teach how to write applications that make efficient use of the operating system. This may require you to implement some entry-level OS-related algorithms inside a "simulated OS project" (say, in Java or Python, could also be in C++). Each aspect can be studied in separate projects/simulators, without using a full-blown OS.
For example, to teach how to use the file cache efficiently, it is necessary to make students play with a "toy" file cache using a simple algorithm.
To teach the hardware aspect of operating system (including the ugliness of it), namely, how it interacts with the instruction set architecture and hardware I/O. This is usually done with "embedded system", with a small prototyping board.
To teach real-world algorithms used inside modern operating system. This will require lots of paper reading, as well as implementing a non-trivial algorithm inside a real Linux kernel. This level is appropriate for graduate studies.
A good project would include one or more of:
Input / Output
Storage
Deciding what to cache / predicting what to pre-load
Starting / managing / logging tasks (processes, threads or Python functions), locally or remotely
Managing resources
Require each process to give estimates of how much peak memory will be used, and to report a "progress" percentage regularly throughout their execution, which can then be used together to make estimates about resource usage
Communication
Concurrency
A project that does not directly interact with hardware, but would still be good project, will be:
If your project provides an abstraction of the operating system to the apps that will run "inside" your project
In other words, the "apps" rely solely on your "operating system project" for their I/O, storage, task management, resource, communication needs
Your project makes good (efficient, measurable) use of the real operating system (Windows, Linux etc)
Then it will be a good Operating Systems project, regardless of the language used.
I would suggest implementing your own memcached, map-reduce or a simple version control system as good project examples.
Edited: removed ranting | 7 | 15 | 0 | 0 | I have been asked to choose a project for my Operating System course at my university. I was bubbled with the idea of making an Operating System from scratch in Python.
I have a few limitations:
I have only 3 months.
I want to do it in Python.
I can put in say 20-30 hours every week into it.
I want to know, how feasible is the idea? Like how far can I go in building the same. I would be very happy, if I can get a basic version running (something with a handful of very basic apps running.) Is it possible with the given limitations?
Is there a book that can help me like a guideline? (need not be for python, I just need a guide to tell me how I should go about making the OS)
If the idea is not feasible, can anyone tell me how much do I need to scale down my idea?
Any help is much appreciated! | Operating System from scratch | 1 | 1 | 1 | 0 | 0 | 13,899 |
3,643,500 | 2010-09-04T18:35:00.000 | 1 | 0 | 1 | 1 | 0 | python,operating-system | 0 | 3,644,442 | 0 | 11 | 0 | false | 0 | 0 | You could probably code a small embedded-system OS in the timeframe you indicate, using concepts that are over a decade old. Many newer operating systems require many more complicated scheduling and memory-management heuristics than would be typical in a small embedded OS; designing an entire modern OS would not be a practical single-person project, but one might be able to do something interesting with some subsystem of it. I personally think there's some room for improvement in flash file systems, but I don't know what your prof would think. What is your prof really looking for? | 7 | 15 | 0 | 0 | I have been asked to choose a project for my Operating System course at my university. I was bubbled with the idea of making an Operating System from scratch in Python.
I have a few limitations:
I have only 3 months.
I want to do it in Python.
I can put in say 20-30 hours every week into it.
I want to know, how feasible is the idea? Like how far can I go in building the same. I would be very happy, if I can get a basic version running (something with a handful of very basic apps running.) Is it possible with the given limitations?
Is there a book that can help me like a guideline? (need not be for python, I just need a guide to tell me how I should go about making the OS)
If the idea is not feasible, can anyone tell me how much do I need to scale down my idea?
Any help is much appreciated! | Operating System from scratch | 1 | 0.01818 | 1 | 0 | 0 | 13,899 |
3,643,500 | 2010-09-04T18:35:00.000 | 0 | 0 | 1 | 1 | 0 | python,operating-system | 0 | 3,643,741 | 0 | 11 | 0 | false | 0 | 0 | Developing an operating system in Python is possible. However, you might want to choose C or Assembly because there's an huge code base developed in those languages. | 7 | 15 | 0 | 0 | I have been asked to choose a project for my Operating System course at my university. I was bubbled with the idea of making an Operating System from scratch in Python.
I have a few limitations:
I have only 3 months.
I want to do it in Python.
I can put in say 20-30 hours every week into it.
I want to know, how feasible is the idea? Like how far can I go in building the same. I would be very happy, if I can get a basic version running (something with a handful of very basic apps running.) Is it possible with the given limitations?
Is there a book that can help me like a guideline? (need not be for python, I just need a guide to tell me how I should go about making the OS)
If the idea is not feasible, can anyone tell me how much do I need to scale down my idea?
Any help is much appreciated! | Operating System from scratch | 1 | 0 | 1 | 0 | 0 | 13,899 |
3,643,500 | 2010-09-04T18:35:00.000 | 2 | 0 | 1 | 1 | 0 | python,operating-system | 0 | 3,643,534 | 0 | 11 | 0 | false | 0 | 0 | I don't get how you think you can write an operating system in Python. You need native code to at least load an interpreter during bootup, not to mention hardware communication, drivers etc., all of which would be nearly impossible to do given current Python interpreters when running on a bare machine. I'm also pondering if you are aware that you'd have to port a given Python interpreter to compile and run without an underlying operating system, which alone would keep you busy for a time.
It's good that you are ambitious, but I honestly think you could not even finish the basic operating system, let alone "some very basic apps running". | 7 | 15 | 0 | 0 | I have been asked to choose a project for my Operating System course at my university. I was bubbled with the idea of making an Operating System from scratch in Python.
I have a few limitations:
I have only 3 months.
I want to do it in Python.
I can put in say 20-30 hours every week into it.
I want to know, how feasible is the idea? Like how far can I go in building the same. I would be very happy, if I can get a basic version running (something with a handful of very basic apps running.) Is it possible with the given limitations?
Is there a book that can help me like a guideline? (need not be for python, I just need a guide to tell me how I should go about making the OS)
If the idea is not feasible, can anyone tell me how much do I need to scale down my idea?
Any help is much appreciated! | Operating System from scratch | 1 | 0.036348 | 1 | 0 | 0 | 13,899 |
3,643,500 | 2010-09-04T18:35:00.000 | 1 | 0 | 1 | 1 | 0 | python,operating-system | 0 | 3,644,477 | 0 | 11 | 0 | false | 0 | 0 | In our university we have operating systems course where we too are supposed to develop something on linux. Not entire OS. We did our own scheduling policy and file system for linux. But this will be done in C since linux is in C. | 7 | 15 | 0 | 0 | I have been asked to choose a project for my Operating System course at my university. I was bubbled with the idea of making an Operating System from scratch in Python.
I have a few limitations:
I have only 3 months.
I want to do it in Python.
I can put in say 20-30 hours every week into it.
I want to know, how feasible is the idea? Like how far can I go in building the same. I would be very happy, if I can get a basic version running (something with a handful of very basic apps running.) Is it possible with the given limitations?
Is there a book that can help me like a guideline? (need not be for python, I just need a guide to tell me how I should go about making the OS)
If the idea is not feasible, can anyone tell me how much do I need to scale down my idea?
Any help is much appreciated! | Operating System from scratch | 1 | 0.01818 | 1 | 0 | 0 | 13,899 |
3,646,002 | 2010-09-05T12:11:00.000 | 6 | 0 | 0 | 0 | 0 | python,django,frameworks,web2py,turbogears | 0 | 4,338,367 | 0 | 7 | 0 | false | 1 | 0 | I have to say as not particularly skilled developer, the speed at which I have been able to create using web2py has blown my mind. In large part due to the amazing community and the core value Massimo has of making the framework accessible.
When I started I had written 0 lines of code in Python
Never heard of web2py
I've been at it seriously for about a month and have progressed (in my usual fashion) from asking questions that no one could answer (because they didn't make any sense) to coding for hours at a time without picking up a book or asking a question.
I'm really impressed. | 3 | 20 | 0 | 0 | I got a project in mind that makes it worth to finally take the plunge into programming.
After reading a lot of stuff, here and elsewhere, I'm set on making Python the one I learn for now, over C# or java. What convinced me the most was actually Paul Graham's excursions on programming languages and Lisp, though Arc is in the experimental stage, which wouldn't help me do this web app right now.
As for web app fast, I've checked out Django, Turbo Gears and Py2Web. In spite of spending a lot of time reading, I still have no clue which one I should use.
1) Django certainly has the nicest online presence, and a nicely done onsite tutorial, they sure know how to show off their thing.
2) Web2Py attracted me with its no-install-needed and the claim of making Django look complicated. But when you dig around on their website, you quickly find content that hasn't been updated in years with broken external links... There's ghosts on that website that make someone not intimately familiar with the project worry if it might be flatlining.
3) Turbo Gears ...I guess its modular too. People who wrote about it loved it... I couldn't find anything specific that might make it special over Django.
I haven't decided on an IDE yet, though I read all the answers to the Intellisense code completion post here. Showing extra code snippets would be cool too for noobs like me, but I suppose I should choose my web frame work first and then pick an editor that will work well with it.
Since probably no framework is hands down the best at everything, I will give some specifics on the app I want to build:
It will use MySQL, it needs register/sign-in, and there will be a load of simple math operations on data from input and SQL queries. I've completed a functional prototype in Excel, so I know exactly what I want to build, which I hope will help me overcome my noobness. I'll be a small app, nothing big.
And I don't want to see any HTML while building it ;-)
PS: thanks to the people running Stackoverflow, found this place just at the right moment too! | Django, Turbo Gears, Web2Py, which is better for what? | 0 | 1 | 1 | 0 | 0 | 15,591 |
3,646,002 | 2010-09-05T12:11:00.000 | 2 | 0 | 0 | 0 | 0 | python,django,frameworks,web2py,turbogears | 0 | 15,945,257 | 0 | 7 | 0 | false | 1 | 0 | I've used both web2py and RoR extensively, and while RoR has gotten a lot of popularity and support in the past few years, web2py is simpler, cleaner, less "magical", and yet also offers more (useful) out-of-the-box functionality. I'd say that web2py has more potential than RoR, but it is a relatively new framework and does yet not have the maturity of RoR. (Despite that, though, I'd choose web2py over RoR any day...) | 3 | 20 | 0 | 0 | I got a project in mind that makes it worth to finally take the plunge into programming.
After reading a lot of stuff, here and elsewhere, I'm set on making Python the one I learn for now, over C# or java. What convinced me the most was actually Paul Graham's excursions on programming languages and Lisp, though Arc is in the experimental stage, which wouldn't help me do this web app right now.
As for web app fast, I've checked out Django, Turbo Gears and Py2Web. In spite of spending a lot of time reading, I still have no clue which one I should use.
1) Django certainly has the nicest online presence, and a nicely done onsite tutorial, they sure know how to show off their thing.
2) Web2Py attracted me with its no-install-needed and the claim of making Django look complicated. But when you dig around on their website, you quickly find content that hasn't been updated in years with broken external links... There's ghosts on that website that make someone not intimately familiar with the project worry if it might be flatlining.
3) Turbo Gears ...I guess its modular too. People who wrote about it loved it... I couldn't find anything specific that might make it special over Django.
I haven't decided on an IDE yet, though I read all the answers to the Intellisense code completion post here. Showing extra code snippets would be cool too for noobs like me, but I suppose I should choose my web frame work first and then pick an editor that will work well with it.
Since probably no framework is hands down the best at everything, I will give some specifics on the app I want to build:
It will use MySQL, it needs register/sign-in, and there will be a load of simple math operations on data from input and SQL queries. I've completed a functional prototype in Excel, so I know exactly what I want to build, which I hope will help me overcome my noobness. I'll be a small app, nothing big.
And I don't want to see any HTML while building it ;-)
PS: thanks to the people running Stackoverflow, found this place just at the right moment too! | Django, Turbo Gears, Web2Py, which is better for what? | 0 | 0.057081 | 1 | 0 | 0 | 15,591 |
3,646,002 | 2010-09-05T12:11:00.000 | 2 | 0 | 0 | 0 | 0 | python,django,frameworks,web2py,turbogears | 0 | 3,757,753 | 0 | 7 | 0 | false | 1 | 0 | Django: Heard it has the best administrative
interface. But uses it's own ORM, i.e. doesn't use SQL-Alchemy.
Web2py: Didn't research this.
Turbogears2:
Uses SQL-Alchemy by default, uses Catwalk for admin
interface, but documentation isn't as
great.
I chose Turbogears2 because it uses popular components, so I didn't have to learn anything new... | 3 | 20 | 0 | 0 | I got a project in mind that makes it worth to finally take the plunge into programming.
After reading a lot of stuff, here and elsewhere, I'm set on making Python the one I learn for now, over C# or java. What convinced me the most was actually Paul Graham's excursions on programming languages and Lisp, though Arc is in the experimental stage, which wouldn't help me do this web app right now.
As for web app fast, I've checked out Django, Turbo Gears and Py2Web. In spite of spending a lot of time reading, I still have no clue which one I should use.
1) Django certainly has the nicest online presence, and a nicely done onsite tutorial, they sure know how to show off their thing.
2) Web2Py attracted me with its no-install-needed and the claim of making Django look complicated. But when you dig around on their website, you quickly find content that hasn't been updated in years with broken external links... There's ghosts on that website that make someone not intimately familiar with the project worry if it might be flatlining.
3) Turbo Gears ...I guess its modular too. People who wrote about it loved it... I couldn't find anything specific that might make it special over Django.
I haven't decided on an IDE yet, though I read all the answers to the Intellisense code completion post here. Showing extra code snippets would be cool too for noobs like me, but I suppose I should choose my web frame work first and then pick an editor that will work well with it.
Since probably no framework is hands down the best at everything, I will give some specifics on the app I want to build:
It will use MySQL, it needs register/sign-in, and there will be a load of simple math operations on data from input and SQL queries. I've completed a functional prototype in Excel, so I know exactly what I want to build, which I hope will help me overcome my noobness. I'll be a small app, nothing big.
And I don't want to see any HTML while building it ;-)
PS: thanks to the people running Stackoverflow, found this place just at the right moment too! | Django, Turbo Gears, Web2Py, which is better for what? | 0 | 0.057081 | 1 | 0 | 0 | 15,591 |
3,647,518 | 2010-09-05T19:46:00.000 | 33 | 0 | 1 | 0 | 0 | python,coding-style,pyqt,pyqt4,pep8 | 0 | 3,647,541 | 0 | 6 | 0 | false | 0 | 0 | In your shoes, I wouldn't fight your framework, just like, as a general principle, I don't fight City Hall;-). I happen to share your preference for lowercase-with-underscore function names as PEP 8 specifies, but when I'm programming in a framework that forces a different capitalization style, I resign myself to adopting that style too, since I can't convince the framework to adopt the "better" style, and style inconsistencies (haphazard mixes of different styles) are really worse.
Of course, some mixage is inevitable if you're using more than one framework... e.g., PyQt with its camelcase, and standard Python library functions with their lowercase and underscores!-). But since frameworks like Qt are often intended to be extended by subclassing, while the standard Python library has less aspects of such a design, in most case where the capitalization style is forced (because you need to override a method, so you can't choose a different capitalization), it will be forced to camelcase (by Qt), only rarely to lowercase (by the standard Python library). So, I think that adopting Qt style in this case is still the lesser evil. | 4 | 35 | 0 | 0 | I'm starting to use PyQt in some projects and I'm running into a stylistic dilemma. PyQt's functions use camel case, but PEP8, which I prefer to follow, says to use underscores and all lowercase for function names.
So on the one hand, I can continue to follow PEP8, meaning that my code will have mixed functions calls to camel case and underscore functions, and even my classes will have mixed function names, since I'll need to be overloading functions like mousePressEvent. Or, I can break PEP8 and adopt camel case for all my function names in the name of consistency.
I realize this is subjective and it's really just what I personally prefer, but I like to hear from others about what they do and why they chose to do it that way. | PEP8 and PyQt, how to reconcile function capitalization? | 0 | 1 | 1 | 0 | 0 | 3,416 |
3,647,518 | 2010-09-05T19:46:00.000 | 6 | 0 | 1 | 0 | 0 | python,coding-style,pyqt,pyqt4,pep8 | 0 | 3,647,555 | 0 | 6 | 0 | false | 0 | 0 | Use what fits best.
If you're subclassing Qt classes, or have a function heavily integrated with them UseCamelCase.
Otherwise, use_underscores. | 4 | 35 | 0 | 0 | I'm starting to use PyQt in some projects and I'm running into a stylistic dilemma. PyQt's functions use camel case, but PEP8, which I prefer to follow, says to use underscores and all lowercase for function names.
So on the one hand, I can continue to follow PEP8, meaning that my code will have mixed functions calls to camel case and underscore functions, and even my classes will have mixed function names, since I'll need to be overloading functions like mousePressEvent. Or, I can break PEP8 and adopt camel case for all my function names in the name of consistency.
I realize this is subjective and it's really just what I personally prefer, but I like to hear from others about what they do and why they chose to do it that way. | PEP8 and PyQt, how to reconcile function capitalization? | 0 | 1 | 1 | 0 | 0 | 3,416 |
3,647,518 | 2010-09-05T19:46:00.000 | 14 | 0 | 1 | 0 | 0 | python,coding-style,pyqt,pyqt4,pep8 | 0 | 5,201,198 | 0 | 6 | 0 | false | 0 | 0 | The pep8 document says what to do in this case (emphasis mine):
New modules and packages (including third party frameworks) should be written to these standards, but where an existing library has a different style, internal consistency is preferred. | 4 | 35 | 0 | 0 | I'm starting to use PyQt in some projects and I'm running into a stylistic dilemma. PyQt's functions use camel case, but PEP8, which I prefer to follow, says to use underscores and all lowercase for function names.
So on the one hand, I can continue to follow PEP8, meaning that my code will have mixed functions calls to camel case and underscore functions, and even my classes will have mixed function names, since I'll need to be overloading functions like mousePressEvent. Or, I can break PEP8 and adopt camel case for all my function names in the name of consistency.
I realize this is subjective and it's really just what I personally prefer, but I like to hear from others about what they do and why they chose to do it that way. | PEP8 and PyQt, how to reconcile function capitalization? | 0 | 1 | 1 | 0 | 0 | 3,416 |
3,647,518 | 2010-09-05T19:46:00.000 | 0 | 0 | 1 | 0 | 0 | python,coding-style,pyqt,pyqt4,pep8 | 0 | 3,647,955 | 0 | 6 | 0 | false | 0 | 0 | Maybe sensible use of modules to separate the styles in different modules can help. At least try to modularize basic PEP8 style code to own module of helper functions. | 4 | 35 | 0 | 0 | I'm starting to use PyQt in some projects and I'm running into a stylistic dilemma. PyQt's functions use camel case, but PEP8, which I prefer to follow, says to use underscores and all lowercase for function names.
So on the one hand, I can continue to follow PEP8, meaning that my code will have mixed functions calls to camel case and underscore functions, and even my classes will have mixed function names, since I'll need to be overloading functions like mousePressEvent. Or, I can break PEP8 and adopt camel case for all my function names in the name of consistency.
I realize this is subjective and it's really just what I personally prefer, but I like to hear from others about what they do and why they chose to do it that way. | PEP8 and PyQt, how to reconcile function capitalization? | 0 | 0 | 1 | 0 | 0 | 3,416 |
3,648,339 | 2010-09-06T00:04:00.000 | 1 | 0 | 1 | 0 | 0 | python,namespaces,module | 0 | 3,648,494 | 0 | 4 | 0 | false | 0 | 0 | Not sure if it is a good practice but maybe you could pass the objects and variables you need as parameters to the methods or classes you call in the imported module. | 1 | 21 | 0 | 0 | Specifically, I need to get at some objects and globals from the main module in an imported module. I know how to find those things when the parent module wants some particular thing from a child module, but I can't figure out how to go in the other direction. | In Python, how can I access the namespace of the main module from an imported module? | 0 | 0.049958 | 1 | 0 | 0 | 8,627 |
3,653,239 | 2010-09-06T17:26:00.000 | 1 | 1 | 0 | 1 | 0 | python,django,nginx,subdomain | 0 | 3,653,270 | 0 | 2 | 0 | false | 0 | 0 | I think directories are the way to go. I believe it would be easier to adapt Django to the directories way much easier than to subdomains. And as one user commented you can avoid restarting your server each time.
I prefer to keep subdomains reserved for system use. Users should get their own directories instead. This is not a rule, just my preference. | 2 | 3 | 0 | 0 | I'm currently building a web application and I would like my users to have their own URLs to identify them. I could either do this using subdomains or using folders and am wondering what are the advantages and disadvantages of either one.
I really like the folder solution because my URL mapping would be fairly easy. I have read about auto-generating subdomains and one solution was to create virtual hosts and then restart my nginx. It's a solution but I would prefer not to have to restart my web server everytime a new account is created. If there are any other ways on how to do automated subdomain creation, that would be great as well!
Thanks! | Subdomains vs folders/directories | 1 | 0.099668 | 1 | 0 | 0 | 286 |
3,653,239 | 2010-09-06T17:26:00.000 | 0 | 1 | 0 | 1 | 0 | python,django,nginx,subdomain | 0 | 3,653,257 | 0 | 2 | 0 | false | 0 | 0 | Use something like mod_wsgi instead of cgi scripts, they allow you to use arbitrary URL configs (example: Django, web.py, Zope ...) | 2 | 3 | 0 | 0 | I'm currently building a web application and I would like my users to have their own URLs to identify them. I could either do this using subdomains or using folders and am wondering what are the advantages and disadvantages of either one.
I really like the folder solution because my URL mapping would be fairly easy. I have read about auto-generating subdomains and one solution was to create virtual hosts and then restart my nginx. It's a solution but I would prefer not to have to restart my web server everytime a new account is created. If there are any other ways on how to do automated subdomain creation, that would be great as well!
Thanks! | Subdomains vs folders/directories | 1 | 0 | 1 | 0 | 0 | 286 |
3,655,306 | 2010-09-07T02:06:00.000 | 7 | 0 | 0 | 1 | 1 | python,ubuntu-9.04 | 0 | 66,512,967 | 0 | 7 | 0 | false | 0 | 0 | @mchid's answer is the one you should go for it.
just FYI,
if you do this:
$ python
it will say Command 'python' not found ...
But if you do this:
$ python3, it should work.
So, just modify the shebang line
from !#/usr/bin/env python
to !#/usr/bin/env python3, you're good to go.
(which is automatically done by doing
sudo apt install python-is-python3) | 1 | 91 | 0 | 0 | I update the kernel, after that the Ubuntu doesn't work well, PS: I try to exec "meld" command, it will report that "/usr/bin/env: python: No such file or directory",
then I exec "sudo apt-get install python" and get the result "python is already the newest version.", what should I do for it.
I'm not good at linux, can you tell me how to revert my linux to the last right status, or reinstall the python normally. | ubuntu /usr/bin/env: python: No such file or directory | 0 | 1 | 1 | 0 | 0 | 161,757 |
3,656,500 | 2010-09-07T07:16:00.000 | 0 | 1 | 0 | 1 | 0 | python | 0 | 3,656,550 | 0 | 3 | 0 | false | 0 | 0 | Just some basic ideas, with important python functions for that:
read the file; open
go through all lines and sum up the number of occurences of a line; for, dict
in case you only want to check parts of a command (for example treat cd XY and cd .. the same), normalize the lines by removing the command arguments after the space; split
sort the sums and print out the command with the highest sum. | 1 | 1 | 0 | 0 | I want to write a python script which reads the '.bash_history' file and prints the statistics. Also, I would like to print the command which was used the most. I was able to read the bash history through the terminal but I'm not able to do it through python programming. Can someone please help me with how to start with it? | reading .bash_history file through python script | 0 | 0 | 1 | 0 | 0 | 696 |
3,666,676 | 2010-09-08T10:17:00.000 | 0 | 0 | 0 | 0 | 1 | python,single-sign-on,plone,zope | 0 | 3,698,638 | 0 | 2 | 0 | false | 1 | 0 | If both sites are on the same domain (but different subdomain), you can try to set the cookie on ".domain.tld". But I'm not sure if that will work - sending the original credentials as cookies is highly insecure, a session should be used in stead, and you can't share this session between two different instances.
Have you considered something like openid, possibly with your own private OpenID provider? That basically implements simple SSO out of the box. | 1 | 2 | 0 | 0 | I'm installing an environment where I had two Zope/Plone servers:
plone1 -> for web content & user authentication
plone2 -> for web applications
I want to implement SSO around both servers but I don't know how to do it. I try to modify login_next and setAuthCookie(..) to share the __ac cookie in the domain, but didn't work.
Anyone know the best way to achieve it!
Thanks in advance,
Oscar Sánchez. | Two Zope/Plone machines and SSO | 0 | 0 | 1 | 0 | 0 | 560 |
3,666,750 | 2010-09-08T10:27:00.000 | 0 | 0 | 1 | 0 | 0 | python,version,backwards-compatibility | 0 | 3,668,628 | 1 | 2 | 0 | false | 0 | 0 | Mac OS X 10.6 (Snow Leopard) has 2.6.1 as the installed version.
IIRC, 10.5 (Leopard) has 2.5 as the installed version. | 1 | 5 | 0 | 1 | Is there an officially updated recommendation indicating which versions of Python should be supported by released modules? Or perhaps a page giving a survey of production usage of various versions? It's difficult to know how much use to make of newish features like context managers, class decorators, etc. when writing a module.
Note that learning which versions of Python are in common usage now is only part of my question; I'd like to find a resource which will provide up-to-date information for future readers of this thread (and myself). | earliest commonly used version of Python | 1 | 0 | 1 | 0 | 0 | 323 |
3,674,568 | 2010-09-09T07:27:00.000 | 0 | 0 | 1 | 0 | 0 | php,python,mysql,ruby-on-rails | 0 | 3,675,235 | 0 | 3 | 0 | false | 1 | 0 | I would go the vitual road (VMware or virtual box). Multiple enviroments have a lot of dependencies, so its just much much easier with vitual hosts. | 2 | 0 | 0 | 0 | Beginner here, stuck wondering what I need to do to learn development in different web environments. Say, for instance I want to play around in PHP & MySQL. But I also want to try things with Ruby on Rails and maybe even server things with Python. Do I need a different environment for each platform? Am I required to have a virtual machine to do so? Is it easy to uninstall and start over for each endeavor for a Windows 7 machine?
Or, better yet, would it just be easier to throw Linux in a virtual environment? | Multiple Web Development Environments on Windows | 0 | 0 | 1 | 0 | 0 | 225 |
3,674,568 | 2010-09-09T07:27:00.000 | 1 | 0 | 1 | 0 | 0 | php,python,mysql,ruby-on-rails | 0 | 3,675,212 | 0 | 3 | 0 | true | 1 | 0 | I started off with php and mysql, it's a lower-level then the rest of the environments like Django and Ruby on Rails; so it's much easier to understand what is really happening.
If you want to get into web development, php is a solid foundation and has easy bundle installers such as WAMP, and has a massive community.
However if understanding the core of web applications is not your goal and you want some magic to make your application quicker and speed through development, you would want to use a web application framework environment, my favorite here is Ruby on Rails.
Ruby on Rails is a little difficult for the newbie to setup, it typically sucks running in Windows, so you'd be better off with an install on top of a UNIX environment such as Linux, Mac OS, BSD.
If you do want to go the rails route, I suggest installing Ruby with a ruby manager called RVM which is very helpful for playing around with Ruby environments.
Django is a good solid framework but it's playing catch up with Rails and in my honest opinion, doesn't have all those power magic that Rails has such as database migrations. | 2 | 0 | 0 | 0 | Beginner here, stuck wondering what I need to do to learn development in different web environments. Say, for instance I want to play around in PHP & MySQL. But I also want to try things with Ruby on Rails and maybe even server things with Python. Do I need a different environment for each platform? Am I required to have a virtual machine to do so? Is it easy to uninstall and start over for each endeavor for a Windows 7 machine?
Or, better yet, would it just be easier to throw Linux in a virtual environment? | Multiple Web Development Environments on Windows | 0 | 1.2 | 1 | 0 | 0 | 225 |
3,678,221 | 2010-09-09T15:49:00.000 | 2 | 1 | 0 | 0 | 0 | python,pylons,textmate | 0 | 3,679,180 | 0 | 2 | 0 | false | 1 | 0 | If you look under the Bundles menu in TextMate there is a Python-specific sub-menu that exposes a bunch of helpful things like syntax checking, script debugging, insertion of oft used code blocks, manual look ups and so on. Most of them are bound to keyboard shortcuts (or can be bound if they are not).
Also, under the Bundles are sort of general-to-code or general-to-text-editing tasks in sub-menus.
You can set up templates for new file creation that let you start new files with all the little bits and pieces you like to see in new files (copyright notice, author, SCC tags, etc.) See the File -> New From Template -> Edit Templates... menu option to do that. It ships with 4 Python templates already.
Finally, that browser is called the Project Drawer. View -> Show Project Drawer to get it to show up. It'll only be available when the window you're viewing is a project window, not a single document window. | 1 | 0 | 0 | 0 | I have textmate, but honestly the only thing I can do with it is simply edit a file.
The handy little file browser is aslo useful. (how can I show/hide that file browser anyhow!)
But I have no other knowledge/tricks up my sleeve, care to help me out? | How can textmate make my python (pylons) development easier? | 0 | 0.197375 | 1 | 0 | 0 | 274 |
3,680,245 | 2010-09-09T20:17:00.000 | 1 | 0 | 1 | 0 | 0 | python,tuples | 0 | 3,680,293 | 0 | 4 | 0 | false | 0 | 0 | (u'1S²') is not a tuple.
(u'1S²',) is a tuple containing u'1S²'.
len((u'1S²',)) returns the length of the tuple, that is, 1.
also, when printing variables, beware there are 2 types of output :
the programmer friendly string representation of the object : that is repr(the_object)
the text representation of the object, mostly applicable for strings
if the second is not availlable, the first is used. unlike strings, tuples don't have a text representation, hence the programmer friendly representation is used to represent the tuple and its content. | 1 | 1 | 0 | 0 | When I print the tuple (u'1S²') I get the predicted output of 1S²
However, when I print the tuple (u'1S²',u'2S¹') I get the output (u'1S\xb2', u'2S\xb9').
Why is this? What can I do about this?
Also, how do I get the number of items in a tuple? | Need help with tuples in python | 0 | 0.049958 | 1 | 0 | 0 | 1,290 |
Subsets and Splits