#python 底层自动引入一个第三方变量进行交换
例：a = 1b = 2c = 3a,b,c = b,c,a ------- #交换变量的值print(a,b,c) ------- a = 2,b = 3,c = 1
#不引入第三方变量进行变量值交换a = 1b = 2
方法：a = a + bb = a - ba = a - b
转载于:https://www.cnblogs.com/lynn-chen/p/8690864.html
