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

[Raymond Hettinger]

Raymond Hettinger <raymond.hettinger at gmail.com> added the comment:

> you're effectively proposing to compute (or update)
> __abstractmethods__ lazily.

Would it be possible to do the update whenever the class dictionary is modified, in PyType_Modified() perhaps (using logic similar to __mro__ updates__)?  

I not pushing for this; am just asking whether it is possible to make sure that __abstractmethods__ is always in sync with reality.

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