[Solved] Python: is isalnum() the same as isalpha with isdigit?

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