解压序列

a,*_,c = '123456'
print(a)
print(_)
print(c)

输出:
1
[‘2’, ‘3’, ‘4’, ‘5’]
6

交换赋值:

a = 'a1'
b = 'b1'
a,b = b,a
print(a)
print(b)

输出:
b1
a1