[Python-mode] python.el (from gnu emacs) vs python-mode.el

[Brendan Miller]

What features does python-mode.el have above the version of python.el
that is included in GNU emacs? How do they compare?

I recently tried to get ipython.el working, and found it had a
dependency on python-mode.el... This has prompted me to wonder what
the real differences between these modes are.

Does ropemacs work with python-mode.el?