Feature Requests item #1283110, was opened at 2005-09-06 11:37 Message generated for change (Tracker Item Submitted) made by Item Submitter You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=355470&aid=1283110&group_id=5470
Please note that this message will contain a full copy of the comment thread, including the initial issue submission, for this request, not just the latest update. Category: Documentation Group: None Status: Open Resolution: None Priority: 5 Submitted By: Tim Peters (tim_one) Assigned to: Nobody/Anonymous (nobody) Summary: Give __len__() advice for "don't know" Initial Comment: A class may wish to define __len__() despite that it doesn't know how many objects iterating an instance may produce. The docs should give advice for this case. They should also explicitly point out that the result of __len__() is generally taken to be a _hint_ (functions like map(), tuple(), etc., may preallocate space based on __len__()'s result, but adjust to the actual number of objects produced). Tail end of a related thread: <http://mail.zope.org/pipermail/zope3-dev/2005- September/015599.html> ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=355470&aid=1283110&group_id=5470 _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
