Message356313
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... |
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Date |
User |
Action |
Args |
2019-11-10 00:20:51 | Nils Kattenbeck | set | recipients:
+ Nils Kattenbeck, gvanrossum, levkivskyi |
2019-11-10 00:20:51 | Nils Kattenbeck | set | messageid: <1573345251.28.0.161181541738.issue38756@roundup.psfhosted.org> |
2019-11-10 00:20:51 | Nils Kattenbeck | link | issue38756 messages |
2019-11-10 00:20:50 | Nils Kattenbeck | create | |
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