Question

i want to expand a list

[1,2,3,4]

by n

e.g. for n = 2:

[1,1,2,2,3,3,4,4]

I’m searching for the smallest possible way to achieve this without any additional librarys.
Its easy to do a loop and append each item n times to a new list… but is there a other way?

Answer 1

>>> l = [1,2,3,4]
>>> [it for it in l for _ in range(2)]
[1, 1, 2, 2, 3, 3, 4, 4]