I use pychecker for checking my python code. Seems optparse.py distributed with python-2.7 could be improved as well:
[system path]/optparse.py:1191: Function (__init__) has too many arguments (11)
[system path]/optparse.py:1206: Local variable (version) shadows global defined on line 10 in file my-test-code.py
[system path]/optparse.py:1400: Local variable (stop) not used
[system path]/optparse.py:1668: (file) shadows builtin
Interestingly, my version variable is overridden by one from optparse.py. But more worrisome is the 'file' variable name.