Doctest-syntax is a project mainly written in Vim Script, it's free.
Highlighting for Python doctest files
This is a mirror of http://www.vim.org/scripts/script.php?script_id=1867
Syntax file for highlighting Python doctest files. This is usefull for when you have your doctests in a seperate from your source code (in a .txt file). The syntax highlighter will color the ReST headers, code blocks and expected values.