Comment 21 for bug 155681

I believe the 134308 should be flagged as duplicate of this one

I still can't understand the workaround given by Brad Crittenden on 2007-10-23:
"For python-mode in emacs22 you must have emacs22-el installed and python-mode not installed."

I have removed and purged the python-mode package, and then installed emacs22-el package.
How do I start python-mode then?
M-x python-mode
gives me a
call-interactively: Cannot open load file: python-mode

thanks