Terry J. Reedy <tjre...@udel.edu> added the comment:
The only specification is that len(ob) calls ob.__len__ and that ob.__len__ should return an 'integer >= 0'. (Adding side effects goes beyond that spec.) I agree that a detectable internal in list is not a bug. Unless there is a realistic performance enhancement in caching the result of the first call, this issue should be closed. ---------- nosy: +terry.reedy type: behavior -> performance _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue39829> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
