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If I have a class hierarchy in Python (we can assume there's no multiple inheritance), how can I find the class in which a method is defined? For example:

class C: def f(): pass class D(C): def f(): pass class E(D): pass

If I call E().f(), this calls the method f that's defined in class D. Is there any way to get this information without calling the method, i.e:

assert get_defining_class(E, f) == D

One idea is to search each class in E.__mro__ for 'f' - would that work?

(This sounds like a duplicate of Find class in which a method is defined, but that question is about finding the defining class from within f itself.)

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Yeah, an MRO search is how you'd do that:

def get_defining_class(klass, methodname): for ancestor in klass.__mro__: if methodname in ancestor.__dict__: return ancestor raise ValueError('Method not found')
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