[issue7105] weak dict iterators are fragile because of unpredictable GC runs

[Charles-François Natali]

Charles-François Natali added the comment:

Shouldn't the documentation be updated?

https://docs.python.org/3.6/library/weakref.html#weakref.WeakKeyDictionary

Note Caution: Because a WeakKeyDictionary 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 WeakKeyDictionary 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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nosy: +neologix

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