[issue41905] add update_abstractmethods function to update an ABC's abstract methods

[Guido van Rossum]

Guido van Rossum <guido at python.org> added the comment:

Why would that require more code? That’s already how it worked. Maybe you misunderstand what I tried to say?

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue41905>
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