方法一:加减法交换
a = 2
b = 3
a = a + b
b = a - b
a = a - b
print("交换后的a:", a) # 输出:3
print("交换后的b:", b) # 输出:2
方法二:异或运算交换
a = 2
b = 3
a = a ^ b
b = a ^ b
a = a ^ b
print("交换后的a:", a) # 输出:3
print("交换后的b:", b) # 输出:2
方法三:使用元组解包交换
a = 2
b = 3
a, b = b, a
print("交换后的a:", a) # 输出:3
print("交换后的b:", b) # 输出:2