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a = 3
b = 5
第一种:引入变量
c = 0
c = a
a = b
b = c
print(a, b)
第二种:运算运算
a = a + b
b = a - b
a = a - b
print(a, b)
第三种:交换值
a, b = b, a
print(a, b)
c = 0
c = a
a = b
b = c
print(a, b)
a = a + b
b = a - b
a = a - b
print(a, b)
a, b = b, a
print(a, b)