I have list1, list2 and list3 and I wnat to merge them to a single array without changing their key
I checked stackoverflow and python.org
list1 =[1,2,3]
list2=[4,5,6]
list3=[7,8,9]
final_expected_result =[[1,4,7],[4,5,8],[3,6,9]]
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isha thakur
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1Possible duplicate of [How to merge multiple lists into one list in python?](https://stackoverflow.com/questions/11574195/how-to-merge-multiple-lists-into-one-list-in-python) – Alex_P Sep 30 '19 at 18:44
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what do you mean by *"merge"* and *"keep their key"*? – FObersteiner Sep 30 '19 at 18:44
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Otherwise, you can create a fourth list and add each of your three lists to the fourth list. – Alex_P Sep 30 '19 at 18:45
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`final_expected_result = [list1, list2, list3]`? – FObersteiner Sep 30 '19 at 18:53
1 Answers
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I think that zip is what you're looking for. zip does return an iterable object, so you'll likely want to convert it to a list.
>>> list(zip(list1, list2, list3))
[(1, 4, 7), (2, 5, 8), (3, 6, 9)]
If you're set on having a list of lists instead of a list of tuples integrate a map into the expression.
>>> list(map(list, zip(list1, list2, list3)))
[[1, 4, 7], [2, 5, 8], [3, 6, 9]]
Jacinator
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what's the point of zipping lists and converting back to `list`? That would just "cut" all lists to the length of the shortest list. `zip` could more likely be useful if you e.g. want to `for a,b,c in zip(list1, list2, list3):` – FObersteiner Sep 30 '19 at 18:54
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@MrFuppes, I entirely agree. However, I've made a point of matching my output to the output specified by OP. Otherwise I wouldn't have bothered with the `map` either. – Jacinator Sep 30 '19 at 18:57
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