Raymond Hettinger added the comment: I had explored this idea previously at some length (no pun intended) but it was mostly a dead-end. The best we ended-up with has having __length_hint__ to indicate size to list().
There were several issues some of which at detailed in the comment at the top of https://hg.python.org/cpython/file/tip/Lib/test/test_iterlen.py . Another *big* issue was that Guido was adamantly opposed to iterators having a length because it changed their boolean value from always-true and it broke some of his published code that depended on iterators never being false, even when empty. ---------- priority: normal -> low _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue24849> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
