On my Macbook (OSX Lion) I'm running python 2.7 with Vim 7.3 and installed pyflakes.
I followed the steps described here, but installed pyflakes, pylint and pep8 with macports.
After running Bundleinstall and starting new Vim I got the following errormessage:
Import Error: cant find module ast
				
                        
Because of a bug in versions of vim < 7.3.430, vundle may not like
filetype onduring configuration. However, pyflakes needsfiletype onIf you cannot update vim to escape the bug, then a workaround is to flip on the filetype before vundle configures pyflakes and then back off afterwards. For example