How to combine lists? (Python)

Question

If I have 2 lists:

list1 = ["X","Y","Z"]
list2 = [1,2,3]

How can I combine them to make a another list:

list3 = [[1,"X"],[2,"Y"],[3,"Z"]]

Thanks in advance!

I think I explained this in [my answer](http://stackoverflow.com/a/23114803/1903116) to your previous question. — thefourtheye, Apr 16 '14 at 17:33
I Apologize, if this is a duplicate question. I'm new to python so couldn't really link and undertand the relationship between this and my previous question. Especially with the sum and dictionary parts of some answers. Sorry again. — DejaVu, Apr 16 '14 at 17:40
@DejaVu Nevertheless, I have answered to show how you could use it specifically in your case. — anon582847382, Apr 16 '14 at 17:41

score 1 · Accepted Answer · answered Apr 16 '14 at 17:33

Just use zip to get tuples of values at corresponding indices in the two lists, and then cast each tuple to a list. So:

[list(t) for t in zip(list1, list2)]

is all you need to do.

Demo:

>>> list1 = ["X", "Y", "Z"]
>>> list2 = [1, 2, 3]
>>> list3 = [list(t) for t in zip(list1, list2)]
>>> list3
[[1, 'X'], [2, 'Y'], [3, 'Z']]

1 Answers1