Determine whether a method was overridden

[Larz60+]

Is this what you want?

class Base(object):
    def f(self):
        raise NotImplementedError()

    def hasF(self):
        return  isinstance(self.f, object)


class Derived(Base):
    def f(self):
        pass

b = Base()
if b.hasF():
    print('Indeed it is')
else:
    print('Nope')