Since Python 2.6, it seems the documentation is in the new reStructuredText format, and it doesn\'t seem very easy to build a Texinfo Info file out of the box anymore.
I
Michael Ernst used to maintain Info formats of Python docs:
http://www.cs.washington.edu/homes/mernst/software/#python-info
You can try using his makefile and html2texi script to generate an updated version. Both are linked at the above URL. I'm not sure how well it works now (the last version was around 2001), but his script is well commented (grep for "python").