Python 交换两个变量的值

今天梳理一下Python中交换变量值的方法

借助临时变量

a = 2
b = 4
c = a
a = b
b = c
print(a) # 4 
print(b) # 2

不借助临时变量

a = 2
b = 4
a = a + b # 2 + 4 = 6
b = a - b # 6 - 4 = 2
a = a - b # 6 - 2 = 4
print(a)
print(b)

第三种方式 很简洁

a = 2
b = 4
a, b = b, a
print(a)
print(b)