The first solution in your e-mail (with a Cleanup exception) is definitely very close, functionally, to what I want to accomplish. In effect, it's the same structure as my original suggestion of "for...then...else", except now it'd be "try: for...else...except". That's workable. I can even cheat and rename the Cleanup class to "Break" for clarity.
I'm guessing that there is not much support for functionality like this to be built in, in a much less verbose manner, like the "for...else" functionality? :P On 6/2/15, Jean-Michel Pichavant <jeanmic...@sequans.com> wrote: > ----- Original Message ----- >> From: "acdr" <mail.a...@gmail.com> >> To: "Jean-Michel Pichavant" <jeanmic...@sequans.com> >> Cc: python-list@python.org >> Sent: Tuesday, 2 June, 2015 2:52:21 PM >> Subject: Re: for...else >> >> That would work for my example, but it would only really work if all >> the calculations are in a nice function. > > You cannot blame me for considering the example you provided ;) > > What about this: > > class Cleanup(Exception): pass > > try: > for x in it: > if c1(): > raise Cleanup() > c2() > if c3(): > raise Cleanup() > except Cleanup: > #do the cleanup > pass > > If you can make c1 c3 raise themselves Cleanup, it's even better. > > Now if you're able to write a cleanup function that can handle the case when > there's nothing to clean, everything becomes crystal clear: > > from contextlib import contextmanager > > @contextmanager > def cleanup(): > yield > # here do the cleaning > print 'I am cleaning' > > def do_the_job(): > if c1() : return > c2() > if c3() : return > > with cleanup(): > do_the_job() > > JM > > > -- IMPORTANT NOTICE: > > The contents of this email and any attachments are confidential and may also > be privileged. If you are not the intended recipient, please notify the > sender immediately and do not disclose the contents to any other person, use > it for any purpose, or store or copy the information in any medium. Thank > you. > -- https://mail.python.org/mailman/listinfo/python-list
