New submission from Daniel Fortunov <pythonb...@danielfortunov.com>:
The doccumentation at https://docs.python.org/3.10/library/weakref.html cautions that the WeakKeyDictionary and WeakValueDictionary are susceptible to the problem of dictionary mutation during iteration. These notes present the user with a problem that has no easy solution. I dug into the implementation and found that fortunately, Antoine Pitrou already addressed this challenge (10 years ago!) by introducing an _IterationGuard context manager to the implementation, which delays mutation while an iteration is in progress. I asked for confirmation and Antoine agreed that these notes could be removed: https://github.com/python/cpython/commit/c1baa601e2b558deb690edfdf334fceee3b03327#commitcomment-39514438 ---------- assignee: docs@python components: Documentation messages: 370860 nosy: dfortunov, docs@python priority: normal severity: normal status: open title: weakref documentation contains cautions about dictionary mutation problems that have been solved in the implementation versions: Python 3.10 _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue40895> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
