python中四种数值交换方法

两个整数变量 a = 5， b = 100，交换数值

1.使用其他变量

c = a
a = b
b = a
print(a, b)

2.不使用临时变量

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)

或者

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)