>>> from isinherited import isinherited

>>> class CLS(object):
    def cls1_func(self): pass

>>> class CLS2(CLS):
    def cls1_func(self): pass
    def cls2_func(self): pass

>>> isinherited(CLS2.cls1_func), isinherited(CLS2.cls1_func,CLS2), isinherited("cls1_func",CLS2)
True, True, True

>>> isinherited(CLS2.cls2_func), isinherited(CLS2.cls2_func,CLS2), isinherited("cls2_func",CLS2)
False, False, False