Nils Kattenbeck <nilskem...@gmail.com> added the comment:
A possible use case would be having multiple users and some groups said users can belong to. When using a WeakSet a user won't be part of a groups after he deleted his account without having to iterate over all groups. class User: pass class Group: users: WeakSet[User] def __init__(self, users: Iterable[User]): self.users = WeakSet(users) # somewhere else a collection of all active users Types I would like to see added as a generic would be primarily: - WeakKeyDictionary - WeakValueDictionary - WeakSet Additionally it would be nice to have generic versions of: - ref (would probably return Optional[T] on call?) - WeakMethod - ProxyType - CallableProxyType Although the last two could probably be just annotated using T because they mostly should behave the same... ---------- _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue38756> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com