Serhiy Storchaka added the comment: See also issue14126.
It makes sense to implement map.__length_hint__() and zip.__length_hint__(). But note that map() and zip() take several iterables, and we should call __length_hint__() for every of them (unless found a one with not implemented __length_hint__()). This can slow down the execution for short sequences. It is impossible to implement reasonable filter.__length_hint__(), because the length of resulting sequence can be from 0 to the length of the input sequence, and returning the maximal value would be not correct. ---------- nosy: +rhettinger _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue26828> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
