bug#3991: 23.1; autoindent problem with new exception formatting in lisp/progmodes/python.el

[Chong Yidong]

> Python2.5 introduced the available use of "finally" with
> "except" in the same "try" exception handling block.  The
> standard GNU Emacs Python mode (python.el) won't perform an
> autoindent correctly when the code reaches the "finally"
> clause
>
> this patch fixes the problem for me:

Thanks.  I've checked it into the repository.