GNU Emacs provides still another python.el mode. See EmacsEditor for more details.
The EmacsWiki page for PythonMode has information on how to install, configure and add shortcuts keys to python-mode.
The current release is version 5.1.0. The list of changes since the last released version are given in detail, as well as some installation notes. If you're having problems with font-lock in python-mode, read the FAQ.