Recursive Digit Sum

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    def superDigit(n, k): str1 = str(n) sum1 = 0 for char in str1: sum1 += int(char) sum1 = k*sum1 while True: str2 = str(sum1) sum1 = 0 for char in str2: sum1 += int(char) if sum1 < 10: break return sum1