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使用临时变量实现:temp = a; a = b; b = temp
temp = a; a = b; b = temp
Python特有的元组解包写法:a, b = b, a
a, b = b, a
直接赋值实现:a = b; b = a
a = b; b = a
算术运算实现:a = a + b; b = a - b; a = a - b
a = a + b; b = a - b; a = a - b