交换两个值的方法

a = 4

b = 5

#交换方式1

c = 0

c = a

a = b

b = c

#方法2

a = a + b

b = a - b

a = a - b

#方法3

a,b = b,a

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转载自www.cnblogs.com/zmw-1997/p/9488187.html