New submission from Serhiy Storchaka <storchaka+cpyt...@gmail.com>:

You can dispatch on collections.abc.Sequence.

@functools.singledispatch
def f(a: collections.abc.Sequence) -> None:
    pass

But MyPy complains about this:

error: Missing type parameters for generic type "Sequence"

MyPy requires parametrized generic (like collections.abc.Sequence[int]), but 
singledispatch() does not work with it.

----------
components: Library (Lib)
messages: 409295
nosy: gvanrossum, kj, rhettinger, serhiy.storchaka
priority: normal
severity: normal
status: open
title: Conflict between using annotations in singledispatch() and MyPy
versions: Python 3.10, Python 3.11, Python 3.9

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue46191>
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