Joshua Oreman <orem...@gmail.com> added the comment:

The problem appears to be occurring when the base class is subscripted, not 
when it's inherited. I can reproduce this issue on Python 3.6.10 by just 
evaluating Base[T].

'del Base.__slots__' after Base is constructed seems to work around the issue, 
and allow Base[T] to be evaluated. Of course, Base is still slotted at this 
point, since __slots__ are consulted only when initially building the class.

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nosy: +Joshua Oreman

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue41451>
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