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

[Kristján Valur Jónsson]

Kristján Valur Jónsson 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.

Btw, the 'patch diff' stuff seems to be broken in the tracker ....

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