Python编程之变量值互换

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问题描述：输入两个变量，交换其变量值。

源代码：

#!/usr/bin/python
# -*- coding: UTF-8 -*-
 
def exchange(a,b):
    a,b = b,a
    return (a,b)
 
if __name__ == '__main__':
    x = 10
    y = 20
    print 'x = %d,y = %d' % (x,y)
    x,y = exchange(x,y)
    print 'x = %d,y = %d' % (x,y)

输出结果如下：

x = 10,y = 20
x = 20,y = 10

x = 1,y = 2
x = 2,y = 1

x = 52,y = 34
x = 34,y = 52

x = 100,y = 200
x = 200,y = 100

x = 598,y = 248
x = 248,y = 598