My Vim ressource file to work with Pylons

In order to edit files generated by the Pylons framework it is necessary to configure your text editor with the following rules:

• insert space characters whenever the tab key is pressed.
• set the number of spaces to 4 whenever the tab key is pressed.

I am using the Vim editor and here is the content of my .vimrc file:

syntax on
set ts=4
set sw=4
set expandtab
set nu
set hlsearch
set ai
set nocompatible
set showmatch