python-mode is missing the class browser

[Michele Simionato]

I have noticed that the python-mode for Emacs that comes with the
latest Ubuntu is missing the class browser. Moreover if works
differently from the python-mode I was used to (for instance CTRL-c-c
works as CTRL-c-! whereas CTRL-c-! is missing, etc). How can I go back
to the old python-mode
or at least how do I get back the class browser?

     Michele Simionato