Forbid subclasses to have the exact same methods as superclasses

[sobolevn]

Right now this code is not an error:

class A:
    def some(self) -> int: ...

class B(A):
    def some(self) -> int: ...

But, it is not a good style. I propose to add a check for this.
Related python/typeshed#7073

[AlexWaygood]

I agree that this would be great. It might be tricky to implement (but my mind is already racing with ideas about how to do it 😀).

We would also have to exclude dunder methods, because we would get a lot of false positives (see discussion in python/typeshed#6877).

[sobolevn]

Offtopic, @AlexWaygood if you are intersted in flake8 plugins, I welcome you giving https://github.com/wemake-services/wemake-python-styleguide a try. It has lots of open feature requests (all are pretty non-trivial).

[AlexWaygood]

Offtopic, @AlexWaygood if you are intersted in flake8 plugins, I welcome you giving https://github.com/wemake-services/wemake-python-styleguide a try. It has lots of open feature requests (all are pretty non-trivial).

I'll add it to my to-do list 😄

[AlexWaygood]

As discussed in python/mypy#13321, this check would be a better fit for a linter that can harness the power of a type checker; let's do that instead.