register cleanup handler

[Laura Creighton]

In a message of Fri, 24 Jul 2015 10:57:30 -0400, Neal Becker writes:
>I know we have try/finally, but I don't think that helps here, because
>code_executed_unconditionally couldn't be inside the try.  Or am I missing 
>something obvious?

I think so.  Either that or I am badly misunderstanding you.  What is
wrong with

try:
   if (condition):
      do_something_needing_cleanup
   else:
      do_something_else
   code_executed_unconditionally
finally:
   do_cleanup

Laura