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Message: [QUOTE="I V, post: 1872191"] If I understand you correctly, isinstance ought to do the job: class A(object): pass class B(A): pass class C(B): pass c = C() assert isinstance(c, C) assert isinstance(c, B) assert isinstance(c, A) However, I'm not sure it's great style to have to inquire about the type of an object, as I would worry it would be fragile if you redesign your class hierarchy. Maybe an alternative would be to add a method to your 'C' class to accomplish whatever it is you need to do? Still, if that doesn't work (sometimes algorithms just are tightly coupled to the specific class hierarchy, and you can't avoid it), isinstance should work. [/QUOTE]