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copied!<p>Thanks Sr2222 for pointing out I was missing the point...</p> <p>Here's the corrected approach which is just like Alex's but does not require to import anything. I don't think it's an improvement though, unless there's a huge hierarchy of inherited classes as this approach stops as soon as the defining class is found, instead of returning the whole inheritance as <code>getmro</code> does. As said, this is a <strong>very</strong> unlikely scenario.</p> <pre><code>def get_class_that_defined_method(method): method_name = method.__name__ if method.__self__: classes = [method.__self__.__class__] else: #unbound method classes = [method.im_class] while classes: c = classes.pop() if method_name in c.__dict__: return c else: classes = list(c.__bases__) + classes return None </code></pre> <p>And the Example:</p> <pre><code>>>> class A(object): ... def test(self): pass >>> class B(A): pass >>> class C(B): pass >>> class D(A): ... def test(self): print 1 >>> class E(D,C): pass >>> get_class_that_defined_method(A().test) <class '__main__.A'> >>> get_class_that_defined_method(A.test) <class '__main__.A'> >>> get_class_that_defined_method(B.test) <class '__main__.A'> >>> get_class_that_defined_method(C.test) <class '__main__.A'> >>> get_class_that_defined_method(D.test) <class '__main__.D'> >>> get_class_that_defined_method(E().test) <class '__main__.D'> >>> get_class_that_defined_method(E.test) <class '__main__.D'> >>> E().test() 1 </code></pre> <p>Alex solution returns the same results. As long as Alex approach can be used, I would use it instead of this one.</p>

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