Re: python-complete-symbol hangs

[Richard Stallman]

    The entire emacs process becomes unresponsive to keystrokes and mouse
    events.  Is there something else I should try?

This seems to imply a fundamental Emacs bug.

Please try this: run Emacs under GDB, reproduce the bug, then stop
Emacs by typing C-z at the terminal where GDB is running.  Then follow
the advice in etc/DEBUG about what to do when Emacs is looping.

I also asked people to look at Dave's patch and maybe install it.
But I suspect there are two separate bugs here, and it would be good
to fix both.