This plugin sets textwidth for python files as specified by the PEP8 style guide. Namely, textwidth is set to 79 for code, and 72 for comments.
Inspiration for this plugin from http://stackoverflow.com/questions/4027222/vim-use-shorter-textwidth-in-comments-and-docstrings.
Use tpope's pathogen.vim.
Vim 7.0+
The behavior of this plugin can be tweaked by modifying the following variables:
let g:pep8_text_width = 79 " Default 79
let g:pep8_comment_text_width = 72 " Default 72
GPL2+