Demonstrating mypy false positive (as of mypy 0.620)

has_no_attribute_in_eq_method.py

class SimpleClass:
    some_int: int
    some_str: str

    def __init__(self, some_int: int, some_str: str) -> None:
        self.some_int = some_int
        self.some_str = some_str

    def __repr__(self) -> str:
        return (f'{self.__class__.__qualname__}'
                f'(some_int={self.some_int!r}, some_str={self.some_str!r})')

    def __eq__(self, o: object) -> bool:
        return (self.__class__ == o.__class__
                and (self.some_int, self.some_str) == (o.some_int, o.some_str))

sc_1 = SimpleClass(42, "foo")
sc_2 = SimpleClass(42, "foo")
assert sc_1 == sc_2