[issue40897] Inheriting from Generic causes inspect.signature to always return (*args, **kwargs) for constructor (and all subclasses)

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpyt...@gmail.com> added the comment:

It is not special for Generic, but happens with every type implementing __new__.

class A:
    def __new__(cls, a=1, *args, **kwargs):
        return object.__new__(cls)

class B(A):
    def __init__(self, b):
        pass

import inspect
print(inspect.signature(B))

The above example prints "(a=1, *args, **kwargs)" instead of "(b)".

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nosy: +serhiy.storchaka, yselivanov

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<https://bugs.python.org/issue40897>
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