How to check version of Python under CGI

[Johann]

I would like to write a simple CGI script to get as much info about
installed Python as possible. But I even don't know how to check
version of Python. :( From shell command  it is easy, but how to do it
from CGI script? Eg.

#!/usr/bin/env python
print "Content-type: text/html\n\n"
print "Python version: %s" %s (IDoNotKnowWhatToChoose(),)

--
Johann