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• Using SimpleXMLTreeBuilder in elementtree

  - by Shard

  I have been developing an application with django and elementtree and while deploying it to the production server i have found out it is running python 2.4. I have been able to bundle elementtree but now i am getting the error: "No module named expat; use SimpleXMLTreeBuilder instead" Unfortunately i cannot upgrade python so im stuck with what i got. How do i use SimpleXMLTreeBuilder as the parser and/or will i need to rewrite code?

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• Help with filetype association!

  - by Zachary Brown

  I have the actual assoication part down, but when I open the file that is associated with my Python program, how do I get the filepath of the file opened? I think it is something like sys.argv? But that just returns the path to the python program, not the associated file.

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• os.environ() giving errors while setting for Hudson

  - by Arnab Sen Gupta

  I want a small python script to set the HUDSON_HOME environment variable. When using the shell, I can easily do this using set HUDSON_HOME=http://localhost:8080 But how can I do the same directly through python?? I don't want to do it by passing the command line to os.system().. can os.environ() be of any help?? I had in my script: import os os.environ('HUDSON_HOME')='http://localhost:8080' but it's probably setting it for the subprocss and not the parent shell..any way around this??

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• Strange Problem with RPy2

  - by jrara

  Hello, After installing RPy2 from http://rpy.sourceforge.net/rpy2.html I'm trying to use it in Python 2.6 IDLE but I'm getting this error: >>> import rpy2.robjects as robjects >>> robjects.r['pi'] <RVector - Python:0x0121D8F0 / R:0x022A1760> What I'm doing wrong?

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• Unicode troubles

  - by user343803

  Hello, i have just known Python for few days. Unicode seems to be a problem with Python. i have a text file stores a text string like this '\u0110\xe8n \u0111\u1ecf n\xfat giao th\xf4ng Ng\xe3 t\u01b0 L\xe1ng H\u1ea1' i can read the file and print the string out but it displays incorrectly. How can i print it out to screen correctly as follow: "Ðèn d? nút giao thông Ngã tu Láng H?" Thanks in advance

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• Temporary PYTHONPATH in Windows

  - by Santa

  How do I set, temporarily, the PYTHONPATH environment variable just before executing a Python script? In *nix, I can do this: $ PYTHONPATH='.' python scripts/doit.py In Windows, this syntax does not work, of course. What is the equivalent, though?

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• untar from run command in fibre

  - by Shah.Bhavesh

  i want to untar file from source to destination with below statement `def untar(source,destination): run("tar -xf {0} {1}".format(source,destination)) ` i am getting Error C:\Users\test\Desktop\fabric>fab -H user@host-p pass untar:source =/shared/sample.tar,destination=/home/ Traceback (most recent call last): File "C:\Users\shasmukh\AppData\Roaming\Python\Python27\site-packages\fabric\m ain.py", line 630, in main docstring, callables, default = load_fabfile(fabfile) File "C:\Users\shasmukh\AppData\Roaming\Python\Python27\site-packages\fabric\m ain.py", line 163, in load_fabfile imported = importer(os.path.splitext(fabfile)[0]) File "C:\Users\shasmukh\Desktop\fabric\fabfile.py", line 11 def copy(source,destination) ^ SyntaxError: invalid syntax

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• How can I tell [G]vim where to look for python26.dll?

  - by Ariel

  I have a version of Vim compiled with python 2.6 support enabled (from here). however vim cannot find the python26.dll. :version confirms +python/dyn :version and gvim.exe confirms DYNAMIC_PYTHON_DLL="python26.dll" echo PATH confirms python26.dll is in the search path. (both c:\windows\system32, and C:\python26) What could I be missing? Did I skip something silly?

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• List multiplication

  - by Schitti

  Hi, Python newbie here. I have a list L = [a, b, c] and I want to generate a list of tuples : [(a,a), (a,b), (a,c), (b,a), (b,b), (b,c)...] I tried doing L * L but it didn't work. Can someone tell me how to get this in python.

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• How to catch an exception thrown in ctypes?

  - by Paul McGuire

  I am working with some C code called from Python using ctypes. Somewhere in the bowels of the C library, an exception is occurring and/or abort() is being called. Is there any way I can catch this in my Python caller code? (Platform is Linux)

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• Which programming language to choose? (for a specific problem/domain, details inside)

  - by Bijan

  I am building a trading portfolio management system that is responsible for production, optimization, and simulation of non-high frequency trading portfolios (dealing with 1min or 3min bars of data, not tick data). I plan on employing Amazon web services to take on the entire load of the application. I have four choices that I am considering as language. a) Java b) C++ c) C# d) Python Here is the scope of the extremes of the project scope. This isn't how it will be, maybe ever, but it's within the scope of the requirements: Weekly simulation of 10,000,000 trading systems. (Each trading system is expected to have its own data mining methods, including feature selection algorithms which are extremely computationally-expensive. Imagine 500-5000 features using wrappers. These are not run often by any means, but it's still a consideration) Real-time production of portfolio w/ 100,000 trading strategies Taking in 1 min or 3 min data from every stock/futures market around the globe (approx 100,000) Portfolio optimization of portfolios with up to 100,000 strategies. (rather intensive algorithm) Speed is a concern, but I believe that Java can handle the load. I just want to make sure that Java CAN handle the above requirements comfortably. I don't want to do the project in C++, but I will if it's required. The reason C# is on there is because I thought it was a good alternative to Java, even though I don't like Windows at all and would prefer Java if all things are the same. Python - I've read somethings on PyPy and pyscho that claim python can be optimized with JIT compiling to run at near C-like speeds.... That's pretty much the only reason it is on this list, besides that fact that Python is a great language and would probably be the most enjoyable language to code in, which is not a factor at all for this project, but a perk. To sum up: - real time production - weekly simulations of a large number of systems - weekly/monthly optimizations of portfolios - large numbers of connections to collect data from There is no dealing with millisecond or even second based trades. The only consideration is if Java can possibly deal with this kind of load when spread out of a necessary amount of EC2 servers. Thank you guys so much for your wisdom.

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• where to use a pyc file?

  - by sia

  i want to know what is a pyc file(python bytecode) i want to know all details, i want to know about the compiler, is it a replacement for exe? does it need to be run by python? is it as portable as .py file is? where sould i use this? tnx

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• wx.NotificationMessage AttributeError: 'module' object has no attribute 'NotificationMessage'

  - by HughGrigg

  I get this error when trying to use wxPython's NotificationMessage class: wx.NotificationMessage("", "Hello world!").Show() AttributeError: 'module' object has no attribute 'NotificationMessage' The code is quite simply: #!/usr/bin/python import wx app = wx.App() wx.NotificationMessage("", "Hello world!").Show() app.MainLoop() What am I missing? This is running on Linux Mint 13, MATE 1.2 desktop environment, Python 2.7.3.

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• Git pre-commit hook: getting list of changed files

  - by Mikko Ohtamaa

  I am developing validation and linting utility to be integrated with various commit hooks, including Git one https://github.com/miohtama/vvv Currently validators and linters are run against the whole project codebase on every commit. However, it would be much more optimal to run them against changed files only. For this, I would need to know changed files list in my Git precommit hook (in Python) https://github.com/miohtama/vvv/blob/master/vvv/hooks/git.py What options I have to extract the changed files list (in Python if that matters)?

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• Delete all characters in a multline string upto a given pattern

  - by biffabacon

  Using Python I need to delete all charaters in a multiline string up to the first occurrence of a given pattern. In Perl this can be done using regular expressions with something like: #remove all chars up to first occurrence of cat or dog or rat $pattern = 'cat|dog|rat' $pagetext =~ s/(.*)($pattern)/$2/xms; What's the best way to do it in Python?

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• How do you throw an HTTP error with mod_python

  - by Zxaos

  I have a setup where I'm serving simple python pages using the mod_python publisher. At some points I'd like to have the python function raise a standard apache error - for example throwing a 500 error if a required file is missing. How can I throw an apache error from within a mod_python script?

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• How do I write a single-file Django application?

  - by obvio171

  I want to write a very small Django application in a single file, requiring all the appropriate modules and stuff, and then be able to run that as a normal Python script, like this: $ python myapp.py You can assume I won't render HTML, so I don't need templates (I'll return JSON or some other auto-generated string).

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• importing class and its function from another file

  - by user343934

  Hi everyone, I am having little problem with importing classes in python. My work flow goes like this index.py class Template: def header(): def body(): def form(): def footer(): display.py I want to call function header(), body() and footer () in my display.py page. Will anyone make me clear about this issue in python. Thanks for your concern.

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• How to debug PYGTK program

  - by Guillaum

  When python raise an exception in the middle of a pygtk signal handling callback, the exception is catched by the gtk main loop, its value printed and the main loop just continue, ignoring it. If you want to debug, with something like pdb (python -m pdb myscript.py), you want that when the exception occure PDB jump on it and you can start debuging. Because of that it's not possible. How can i debug pygtk program then ?

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• Using PyUNO on Windows and CentOS

  - by Karim

  Is there any way to use OpenOffice's PyUNO without using the version of Python that comes with OpenOffice? I mean, can I install a package (on Windows and CentOS) that uses the version of Python that's already on the server? I'm trying to use OpenOffice in headless mode so that I can do document conversion with a script (ultimately on a hosted server running CentOS) but my development work is being done on Windows and occassionally the Mac). I'm having nothing but trouble getting this to work.

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• Azure SDK + Django + Visual Studio 2012 - Publish to Azure succeeds, but I get 500 error

  - by hume

  I followed the instructions here: https://www.windowsazure.com/en-us/develop/python/tutorials/django-with-visual-studio/ However, whenever I try to open the url to my web app in the cloud I get a 500 error. The tutorial doesn't mention setting up the TEMPLATE_DIRS setting in the django application or doing any work on the cloud service machine to install python/django. Could these be the problem?

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• What's the advantage of using with .. as in pyhon?

  - by prosseek

  with open("hello.txt", "wb") as f: f.write("Hello Python!\n") seems to be the same as f = open("hello.txt", "wb") f.write("Hello Python!\n") f.close() What's the advantage of using open .. as instead of f = ? Is it just syntactic sugar? Just saving one line of code?

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• Delete all characters in a multline string up to a given pattern

  - by biffabacon

  Using Python I need to delete all charaters in a multiline string up to the first occurrence of a given pattern. In Perl this can be done using regular expressions with something like: #remove all chars up to first occurrence of cat or dog or rat $pattern = 'cat|dog|rat' $pagetext =~ s/(.*?)($pattern)/$2/xms; What's the best way to do it in Python?

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• Matplotlib installation problems

  - by Werner

  Hi, I need to install matplotlib in a remote linux machine, and I am a normal user there. I downlodad the source and run python setup.py build but I get errors, related with numpy, which is not installed, so I decieded to install it first. I download and compile with python setup.py build My question now is, how do I tell to teh matplotlib installation where the numpy files have been installed? Thanks

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• about feeding of pythons

  - by djz

  i want to feed python but i cant see them eating live once . do they eat dead one ... and if i feed them a chicken leg piece which is boiled for the python to look like the live pray due to its heat will he eat ??? .. plz answer ....sir.....

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