不用中间变量交换a和b的值？

a =

b =

a = a+b

b = a-b

a = a-b

print(a,b)

a =

b =

a = a^b

b = b^a

a = a^b

print(a,b)

a =

b =

a,b = b,a

print(a,b)

输出

(, )

(, )

(, )