最大公约数和最小公倍数的概念大家都很熟悉了，在这里就不多说了，今天这个是因为做题的时候遇到了所以就写下来作为记录，也希望帮到别人，下面是代码：

#!/usr/bin/env python
#coding:utf-8
from fractions import gcd

#非递归实现
def gcd_test_one(a, b):
    if a!=0 and b!=0:
        if a>b:
            a, b=b, a
        if b%a==0:
            return a
        gcd_list=[]
        for i in range(1,a):
            if b%i==0 and a%i==0:
                gcd_list.append(i)
        return max(gcd_list)
    else:
        print 'Number is wrong!!!'
    


#递归实现
def gcd_test_two(a, b):
    if a>b:
        a, b=b, a
    if b%a==0:
        return a
    else:
        return gcd_test_two(a,b%a)


#python自带的gcd
def gcd_test_three(a, b):
    return gcd(a,b)


if __name__ == '__main__':
    print gcd_test_one(12,24)
    print gcd_test_one(12,8)
    print gcd_test_one(6,24)
    print gcd_test_one(0,24)
    print '----------------------------------------------------------------------------'
    print gcd_test_two(12,24)
    print gcd_test_two(12,8)
    print gcd_test_two(6,32)
    print '----------------------------------------------------------------------------'
    print gcd_test_three(12,24)
    print gcd_test_three(12,8)

12
4
6
Number is wrong!!!
None
----------------------------------------------------------------------------
12
4
2
----------------------------------------------------------------------------
12
4