2个整数变量 a = 5， b = 100 ，互换标值
1.应用别的变量
c = a
a = b
b = a
print(a, b)
2.不应用临时性变量
a = a b
b = a - b
a = a - b
print(a, b)
3.利用元组
# a, b = (b, a)
a, b = b, a
print(a, b)
或是
def exchange():
b = 100
a = 6
return b, a
a, b = exchange()
print(a, b)
4.异或运算
a = a ^ b
b = a ^ b
a = a ^ b
print(a, b)
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