Python

Intro

This cheat sheet helps troubleshoot common problems...

Some good documentation source:

• http://www.python.org/doc/2.5.4/download/
• apprendre a programmer avec python by gerard swinnen (french, free PDF on the net)

Tricks

Finding what's in an object

>>> dir(obj)

Editor tricks

Emacs

See http://python.about.com/b/2007/09/24/emacs-tips-for-python-programmers.htm

• C-c <: Shift the region to the left
• C-c >: Shift the region to the right

Problems

I installed some modules / packages and can't load them

echo $PYTHONPATH

$ python
Python 2.5.2 (r252:60911, Feb 22 2008, 07:57:53) 
[GCC 4.0.1 (Apple Computer, Inc. build 5363)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import sys
for i in sys.path: 
    print i

You can add a .pth file in one of the already loaded dir: see http://djangotricks.blogspot.com/2008/09/note-on-python-paths.html

like:

# cat > /Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site-packages/others.pth
/Library/Python/2.5/site-packages/
^D