raise NotImplemented should be raise NotImplementedError (F901)

NotImplemented is a special value which should be returned by the binary special methods to indicate that the operation is not implemented with respect to the other type. Raise NotImplementedError to indicate that a super-class method is not implemented and that child classes should implement it.

Anti-pattern

class BaseClass:
    def abstract_method(self):
        raise NotImplemented

Best practice

class BaseClass:
    def abstract_method(self):
        raise NotImplementedError