python file versioning

[Diez B. Roggisch]

You can always have conditional imports based on the interpreter version
like this:

import sys

if sys.version_info[:2] == (2,2):
    from __future__ import nifty_feature


And you can extend that to class definitions and the like, too. And
import-hooks might help, too.

-- 
Regards,

Diez B. Roggisch