def fact(n): ''' Calculate 1*2*...*n >>> fact(1) 1 >>> fact(10) 3628800 >>> fact(-1) Traceback (most recent call last): ... ValueError ''' 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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Han小胖黑洲非