在Python中解压* args的顺序

Question

I wonder why variable last is 5 when i do

first, *rest, last = 1,2,3,4,5

I thought assignment goes from left to right, thus *rest will be [2,3,4,5] , but it actualy is [2,3,4] And I thought that last will be empty, or this code will cause error, but suprisingly it works, but I dont understand why

Answer 1

这是仅在Python 3中有效的语法，称为“扩展解压缩”，并且在PEP 3132中定义-https: //www.python.org/dev/peps/pep-3132/

Answer 2

Just because it's unpacking feature.

first and last are just variables, when *rest are arguments, so they get everything between first and last value in tuple (1,2,3,4,5).

If you want to have you wrote:

[2,3,4,5]

then just use:

first, *args = 1,2,3,4,5
# first --> 1
# args --> [2,3,4,5]