详解用python计算阶乘的几种方法

import functools
result = (lambda k: functools.reduce(int.__mul__, range(1, k + 1), 1))(5)
print(result)

x = 1
y = int(input("请输入要计算的数:"))
for i in range(1, y + 1):
  x = x * i
print(x)

def func(n):
  if n == 0 or n == 1:
    return 1
  else:
    return (n * func(n - 1))


a = func(5)
print(a)