Question

Basically, I have a list and I want to perform multiple functions on it at once. For example,

List = [1,2,3,4,5]
List.extend([1,2,3,4,5]).sort().reverse()

I would like the result to be [5,5,4,4,3,3,2,2,1,1].

I haven’t used Python in a while, but I know I’ve done something like this before. Is it something simple I’m missing or what?

It has to all be on one line by the way.

Answer 1

Most Python methods that mutate a container in-place return None

However your example can easily be handled in one line

L = [1,2,3,4,5]
L = sorted(L+[1,2,3,4,5], reverse=True)

Keeping in the spirit of the challenge, it’s not hard to chain the operations (because they always return None)

>>> L = [1, 2, 3, 4, 5]
>>> L.extend([1,2,3,4,5]) or L.sort() or L.reverse() or L
[5, 5, 4, 4, 3, 3, 2, 2, 1, 1]

Here’s another way

>>> L = [1, 2, 3, 4, 5]
>>> (L.extend([1,2,3,4,5]), L.sort(), L.reverse()) and L
[5, 5, 4, 4, 3, 3, 2, 2, 1, 1]

And you can let your imagination run wild

>>> L = [1, 2, 3, 4, 5]
>>> max(L.extend([1,2,3,4,5]), L.sort(), L.reverse(), L) # Python2.x only
[5, 5, 4, 4, 3, 3, 2, 2, 1, 1]