def fact(n): ''' >>> fact(0) Traceback (most recent call last): ... ValueError >>> fact(1) 1 >>> fact(2) 2 >>> fact(3) 6 >>> fact(5) 120 ''' if n < 1: raise ValueError() if n == 1: return 1 return n * fact(n - 1) if __name__ == '__main__': import doctest doctest.testmod()
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