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""" 使用map和reduce实现阶乘求和 x!+(x-1)!+(x-2)!+...+1! x! = x * (x-1) * (x-2) * ... * 1 0! = 1 """ # coding = utf-8 def factorial(n): return reduce(lambda x,y:x*y, range(1, n+1)) def factorial_sum(n): """ 阶乘求和 """ if n == 0: return 1 else: a = map(lambda x:factorial(x), range(1, n+1)) b = reduce(lambda x,y:x+y, a) return b print factorial_sum(5) 153