[issue17936] O(n**2) behaviour when adding/removing classes

[Antoine Pitrou]

Antoine Pitrou added the comment:

> Right, I misread the code.
> Since the remove_subclass() function is called when a subclass dies,
> I don't think it is necessary to clear out weak references in
> add_subclass().  They are there merely to break the reference cycle.

Agreed.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17936>
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