How do I get a beta test version of Python?
All releases, including alphas, betas and release candidates, are announced on the comp.lang.python and comp.lang.python.announce newsgroups. All announcements also appear on the Python home page, at http://www.python.org/; an RSS feed of news is available.
You can also access the development version of Python through subversion. See
http://www.python.org/dev/devfaq.html#subversion-svn (dead link) for details.