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Thu Jul 20 08:56:37 EDT 2017 · https://mail.python.org/pipermail/python-dev/2017-July/148675.html

On Thu, 20 Jul 2017 21:29:18 +0900
INADA Naoki <songofacandy at gmail.com> wrote:
> 
> WeakSet should be cared specially.
> Maybe, ABCMeta can be optimized first.
> 
> Currently, ABCMeta use three WeakSets.  But it can be delayed until
> `register` or
> `issubclass` is called.
> So even if WeakSet is implemented in Python, I think ABCMeta can be much faster.

Simple uses of WeakSet can probably be replaced with regular sets +
weakref callbacks.  As long as you are not doing one of the delicate
things (such as iterate), it should be fine.

Regards

Antoine.

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