Given an array of integers Python, it determines whether there is a repeating element.

If no value occurs twice in the array, the function returns true, if each element of each array are not the same, false is returned.

eg: Input: [4, 1]

        Output: true

        Input: [1,2,3,4]

        Output: false

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def num(a):
    if len(set(a)) == len(a):
        print(False)
    else:
        print(True)