On Sun, Jun 15, 2008 at 1:03 AM, Nick Coghlan <[EMAIL PROTECTED]> wrote: > Raymond Hettinger wrote: >> >> I don't favor one over the other. Am just pointing-out that the proposal >> is a little more complex than simply wishing for an ordered verion of a >> dictionary and expecting that that wish is self-defining in a way the >> matches everyone's intuition, use cases, and expectations. > > If you have an odict with first-insertion ordering, it's fairly trivial to > convert it to a dictionary with last-insertion ordering: > > class odictlastinsertion(odict): > def __setitem__(self, k, v): > self.pop(k, None) > self[k] = v > > As you note, going the other way would be rather difficult, suggesting that > the version ordered by the first key insertion is the more fundamental > structure. > > A PEP would definitely be needed to thrash out those kind of issues and > decisions though
Right. Though on this particular issue, my gut instinct tells me that first-insertion-order is more useful (matching your assertion above). -- --Guido van Rossum (home page: http://www.python.org/~guido/) _______________________________________________ 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
