Guido van Rossum <gu...@python.org> added the comment:

I've only seen it in test cases too -- that's one of the very few
situations where it makes sense to define a class inside a function.
(Creating a class is an expensive operation, so any function that expects
to be called more than once is better off moving the class out of the
function.)

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue41872>
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