On Thu, Mar 8, 2012 at 10:32 AM, Jim J. Jewett <jimjjew...@gmail.com> wrote: > How is this a problem? > > Re-entering a generator is a bug. Python caught it and raised an > appropriate exception.
No, the problem was that the interpreter screwed up the state of the generators while attempting to deal with the erroneous reentry. The ValueError *should* just be caught and completely suppressed by the try/except block, but that wasn't quite happening properly - the failed attempt at reentry left the generators in a dodgy state (which is why the subsequent "3" was being produced, but then the expected final "4" vanished into the electronic ether). Benjamin figured out where the generator's reentrancy check was going wrong, so Stefan's example should do the right thing in the next alpha (i.e. the ValueError will still get raised and suppressed by the try/except block, the inner generator will complete, but the outer generator will also continue on to produce the final value). Cheers, Nick. -- Nick Coghlan | ncogh...@gmail.com | Brisbane, Australia _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
