[issue36848] autospec fails with AttributeError when mocked class has __signature__ non-writeable

[Chris Withers]

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

We only attempt to set __signature__ on Mocks, so I don't think extensions will be a problem.

I do think there's a bit of code smell on that method: it's called _check_* and then changes some attributes, that might be worth fixing?

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue36848>
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