It looks like Python 2.6 (SUNWpython26) has the fewest anciliary packages, Python 2.5 has a few more (SUNWpython25-twisted-web2, SUNWpython25-simplejson, SUNWpython25-cssutils, SUNWpython25-twisted, SUNWlibpigment-python25), and Python 2.4 has by far the most.
(Try "pkg search -r python2.x", where x is {4,5,6})
