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string - Python: is isalnum() the same as isalpha with isdigit?

Is there a way to concretely verify this? I tried to solve a coding question but it seems one of the test cases (not revealed to me) takes this as wrong. In what kinds of cases does this fail to be true?

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There are cases when both isalpha and isdigit returns False, but isalnum returns True. So isalnum is not just a combination of the other two.

>>> 'a1'.isalpha(), 'a1'.isdigit(), 'a1'.isalnum()
(False, False, True)

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