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#!/usr/bin/env python3

# -*- coding: utf-8 -*-

# Author: xurongzhong#126.com wechat:pythontesting qq:37391319

# qq群：144081101 591302926 567351477

# CreateDate: 2018-6-25

# factorial.py

def factorial(n):

"""Return n! = 1*2*3*...*n."""

if n <= 1:

return 1

return n * factorial(n - 1)

def main():

for n in range(20):

print(n, factorial(n))

print(factorial(2000))

main()