Correcting VIM indention, Python

First off, get your VIM editor up to speed.

http://henry.precheur.org/2008/4/18/Indenting_Python_with_VIM.html

Check that your filetype and settings are correct...

:filetype

filetype detection:ON  plugin:ON  indent:ON                   1,0-1         Top

Now issue the magic VIM command to re-tab the entire file.

gg=G

Or here's an alternative that converts all tabs to spaces

:set tabstop=4
:set shiftwidth=4
:set expandtab
:retab