Joining list of lists by element

Question

I want to join list of lists by element such that

lst = [['a','b','c'], [1,2,3], ['x','y','z'], [4,5,6]]

becomes

res = [['a',1,'x',4], ['b',2,'y',5], ['c',3,'z',6]]

I'v tried using list comprehension, concatenate and map, but haven't had any luck with it yet. (New to python)

the letter in the lst list are char or variable? – Carlo Zanocco Feb 27 '19 at 09:42 — Carlo Zanocco, Feb 27 '19 at 09:42
Use `zip` Ex: `print(zip(*lst))` – Rakesh Feb 27 '19 at 09:42 — Rakesh, Feb 27 '19 at 09:42
@CarloZanocco I edited the question, thanks – Andri Már Stefánsson Feb 27 '19 at 09:44 — Andri Már Stefánsson, Feb 27 '19 at 09:44

score 3 · Accepted Answer · answered Feb 27 '19 at 09:43

3

Try zip (similar question: Transpose list of lists):

>>> lst = [["a","b","c"], [1,2,3], ["x","y","z"], [4,5,6]]
>>> res = [list(zipped) for zipped in zip(*lst)]
>>> res
[['a', 1, 'x', 4], ['b', 2, 'y', 5], ['c', 3, 'z', 6]]

answered Feb 27 '19 at 09:43

mfrackowiak

1,294
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11

This is pretty much the solution that I think about, it was so obvious to use the zip function. This is the best way that you can find to do that! @Andri Már Stefánsson You have the solution here – Carlo Zanocco Feb 27 '19 at 09:50
this is exactly what I was looking for, thanks – Andri Már Stefánsson Feb 27 '19 at 09:59

Joining list of lists by element

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