emacs22 currently in unstable (22.1+1-1) has its own python-mode, and in fact, having python-mode installed on the system at all breaks the built-in python-mode in emacs22. With python-mode installed, I get this in emacs22 when running M-x python-mode:
Loading python-mode... eval: Recursive `require' for feature `sb-info' purging the python-mode makes the 'python-mode built into emacs22 functional again. stew
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