How to find factorial in python

Python factorial method: 1. Use an ordinary for loop; 2. Use the [reduce()] function, the code is [num = reduce(lambda x,y:x*y,range(1,7 ))]; 3. Use the [factorial()] function; 4. Call the method recursively.

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Python factorial method:

The first method : Ordinary for loop

a = int(input('please inputer a integer:')) num = 1 if a < 0: print('负数没有阶乘！') elif a == 0: print('0的阶乘为1！') else : for i in range(1,a + 1): num *= i print(num)

The second type: reduce() function

#从functools中调用reduce()函数 from functools import reduce #使用lambda，匿名函数，迭代 num = reduce(lambda x,y:x*y,range(1,7)) print(num)

The third type: factorial() function

import math value = math.factorial(6) print(value)

The fourth type: recursive call

def num(n): if n == 0: return 1 else: return n * num(n - 1) print(num(6)

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