Python 1-liner (when the <input, output> pairs of a mapping can be exhausted)

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    That's what happened when the <input, output> pairs of any problem can be exhausted. In other words, as long as the mapping behavior of a function is fixed, one cannot distinguish how the function is actually implemented.

        def checkPerfectNumber(self, num):
            return num in [6, 28, 496, 8128, 33550336]

    For example, given integer n > 0, write a function to return true iff x^n + y^n = z^n has positive integer solution (x, y, z).

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