On Wed, 4 Oct 2017 08:47:46 +0300 Serhiy Storchaka <storch...@gmail.com> wrote: > 04.10.17 07:58, Nick Coghlan пише: > > For deque specifically, I like Steven D'Aprano's suggestion of a > > "__dropped__" or "__discard__" subclassing API that makes it > > straightforward to change the way that queue overruns are handled > > (especially if raising an exception from the new subclass method can > > prevent the collection modification entirely - that way you could > > readily change the deque semantics in a subclass such that if the > > queue fills up, submitters start getting errors instead of silently > > discarding older messages, allowing backpressure to be more easily > > propagated through a system of queues). > > Wouldn't this harm performance? Looking up the attribute of the type is > more costly than pushing/popping the item in the deque.
You would only do that for subtypes, so when Py_TYPE(self) is different from the base type. This is a simple pointer comparison. Nick's idea sounds nice to me, as long as there's an actual use case :-) Regards Antoine. _______________________________________________ Python-ideas mailing list Python-ideas@python.org https://mail.python.org/mailman/listinfo/python-ideas Code of Conduct: http://python.org/psf/codeofconduct/
