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Sat Oct 8 22:55:25 EDT 2016 · https://mail.python.org/pipermail/python-dev/2016-October/146601.html

On Fri, Oct 7, 2016 at 3:52 PM, Ivan Levkivskyi <levkivskyi at gmail.com> wrote:
> I have a question about the registration of builtins. Currently, typing.py
> contains this line:
>
>     ByteString.register(type(memoryview(b'')))
>
> But there are two test lines in test_collections.py
>
>     self.assertNotIsInstance(memoryview(b""), ByteString)
>     self.assertFalse(issubclass(memoryview, ByteString))
>
> This looks like a contradiction. Which one is right?
> Should these tests be removed or the registration in typing.py?

Looks like the registration is in error. The stubs (and hence mypy)
don't consider memoryview consistent with ByteString.

-- 
--Guido van Rossum (python.org/~guido)

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[Python-Dev] Is explicit registration of Iterators needed?