序列解包:
同时(并行)给多个变量赋值:
>>> a,b,c = 1,2,3
>>> print(a,b,c)
1 2 3
直接交换多个变量的值:
>>> a,b = b,a
>>> print(a,b,c)
2 1 3
>>> a,b,c = c,a,b
>>> print(a,b,c)
3 2 1
当赋值个数不一致时,可用星号(*)来收集多余的部分
>>> a,b,*c = "hello"
>>> print(a,b,c)
h e ['l', 'l', 'o']
>>> a,*b,c = [1,2,3,4,5]
>>> print(a,b,c)
1 [2, 3, 4] 5
>>> *a,b,c = 1,2,3,4,5
>>> print(a,b,c)
[1, 2, 3] 4 5