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Python2.5 has grown a sys.subversion attribute:

   ('CPython', 'trunk', '51999')

The first field is intended to describe the exact
implementation of Python.  platform.py could
return this if it is available.  It should also
probably try to use sys.version_info instead of,
or in addition to, using a regexp on sys.version.
One can hope that in the long term the
version_info and the subversion attributes
should eventually be supported by all Python
implementation (PyPy...).