Hello!

I've managed to enable completion in Python interpreter buffer, patch
attached. The change in python-check-comint-prompt also fixes
completion in Python buffer when prompt in interpreter buffer is not
clear (a command is entered but not yet executed).

I didn't notice any regressions yet, but maybe the "\\="-thingy was
actually meaning something :-)  Please review my patch, I'm ready to
improve it if needed.

Best wishes,
Andrey Paramonov