class weakref.WeakValueDictionary([dict])
Mapping class that references values weakly. Entries in the dictionary will be discarded when no strong reference to the value exists any more.
Note
Caution: Because a WeakValueDictionary is built on top of a Python dictionary, it must not change size when iterating over it. This can be difficult to ensure for a WeakValueDictionary because actions performed by the program during iteration may cause items in the dictionary to vanish “by magic” (as a side effect of garbage collection).
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