multiple versions of python

[sokovic.anamarija at gmail.com]

Hi,

what is the generally recommended structure when we have into play this type of problem:
multiple versions of python (both in the sense of main versions and sub versions, e.g., 
2.7 :
   2.7.1
   2.7.3
3:
 3.3
   3.3.1
Different versions of gcc
different compilation strategies (-vanilla and non-vanilla)
different modules (numpy,scipy) together with the different versions of all the rest.

any help is appreciated

Ana