David Ascher (at Brown) has a very good page devoted to Python
I have started to write a Perl/Python phrasebook, containing a collection of idioms, various ways of accomplishing common tasks, tricks and useful things to know, in Perl and Python side-by-side. I hope this will be useful for people switching from Perl to Python, and for people deciding which to choose. The first part of the phrasebook is based on Tom Christiansen's Perl Data Structures Cookbook.
Tom Christiansen has written a good comparison of Perl and Python.
Comparisons of Tcl, python, lisp and perl