Unmaking a nested list

Question

If I had a nested list:

Nes = [[2, 2], [4, 4], [8, 8], [16, 16]]

Would there any possible way to "unnest" it by making all the brackets inside the list go away so that Nes now looks like:

Nes = [2, 2, 4, 4, 8, 8, 16, 16]

blhsing · Answer 1 · 2018-07-04T01:48:31.607

0

You can use list comprehension:

Nes = [[2, 2], [4, 4], [8, 8], [16, 16]]
print([i for sublist in Nes for i in sublist])

This outputs:

[2, 2, 4, 4, 8, 8, 16, 16]

Please refer to the official documentation on Nested List Comprehensions for details.

edited Jul 04 '18 at 01:48

answered Jul 04 '18 at 01:45

blhsing

I have never used list comprehension before. Can you explain what that line of code does. – J. Doe Jul 04 '18 at 01:46
Flag these answers as duplicates instead of answering them in the future. – user3483203 Jul 04 '18 at 01:48
@J.Doe I've edited my answer with a reference. – blhsing Jul 04 '18 at 01:48

score 0 · Answer 2 · answered Jul 04 '18 at 01:46

0

use itertools

from itertools import chain

Nes = [[2, 2], [4, 4], [8, 8], [16, 16]]

list(chain.from_iterable(Nes))

output:

[2, 2, 4, 4, 8, 8, 16, 16]

answered Jul 04 '18 at 01:46

H.Bukhari

2 Answers2