创建新列表而不更改原始列表

Question

I have a list :

         L=[2,0,4,5]

and I want to create a new list without changing L itself:

        K= [0,2,4,5]

but when I try:

       K=L.sort()
       print(K)

it prints nothing, and if I try:

       print(L)

it comes out : [0,2,4,5]

why K is not =[0,2,4,5]? and how can I make a new list [0,2,4,5] and don't change L?

Answer 1

The following will make a sorted copy of L and assign it to K :

K = sorted(L)

sorted() is a builtin function.

The reason K = L.sort() doesn't work is that sort() sorts the list in place , and returns None . This is why L ends up being modified and K ends up being None .

Here is how you could use sort() :

K = L[:] # make a copy
K.sort()

Answer 2

你需要使用内置函数sorted ： sorted(L)