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

[Antoine Pitrou]

Antoine Pitrou added the comment:

> One question:  I saw you clearing exceptions in the tp_clear()
> function, isn't it better to use PyErr_PrintUnraisable()?

You're right, that would be better. I was just being lazy.

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