Python Mode (python-mode.el) is a major editing mode for the EmacsEditor. It is part of the source distribution of Python (as the file Misc/python-mode.el).
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 6.1.2. The list of changes since the last released version are given, as well as some resources providing installation notes. An example how to setup a complete IDE around python-mode.el was shown at EuroPython 2013. See also