[issue30463] Add __slots__ to ABC convenience class

[Chris Withers]

Chris Withers <chris at withers.org> added the comment:

I will note that this means with:

class BaseClass(ABC):
    pass


class MyDerivedClass(BaseClass):

    def __init__(self, thing):
        self.thing = thing

thing = MyDerivedClass()

thing now has both __slots__ and, evidently, a dict. That's a bit weird and confusing.

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nosy: +cjw296

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue30463>
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