Creating a list of values of the same index from another list

Question

I was wondering how you can create a list of values of the same index from another list, when the amount of values is not known beforehand.

for example I have the list

list = [[25,75,94,63],[55,13,0,99],[41,63,93,25]]

I want a second list that would be

[[25,55,41],[75,13,63],[94,0,93],[63,99,25]]

If possible I would like the answer to only use simple python functions and without the use of importing a module. And if possible how to do so using a loop (probably nested?)

Thanks

The "zip" function can help here. It produces tuples which must be converted back to lists then. A loop can do that. You should show your own effort and code (properly formatted in the question) to solve it. — Michael Butscher, Apr 15 '20 at 02:51
@JoshuaVarghese Of course it can also be done without "zip". — Michael Butscher, Apr 15 '20 at 02:54
This is *transposing* the lists. In other words, inverting the rows and columns. — RoadRunner, Apr 15 '20 at 02:59

score 3 · Answer 1 · answered Apr 15 '20 at 02:51

3

You're looking for the zip builtin function which does precisely what you'd expect.

answered Apr 15 '20 at 02:51

THG

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score 0 · Accepted Answer · answered Apr 15 '20 at 02:52

0

Try:

a = []
for j in range(len(list1[0])):
    a.append([i[j] for i in list1])

Here is a one-liner:

[[i[j] for i in list1] for j in range(len(list1[0]))]

This gives the output:

[[25, 55, 41], [75, 13, 63], [94, 0, 93], [63, 99, 25]]

answered Apr 15 '20 at 02:52

Joshua Varghese

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Creating a list of values of the same index from another list

2 Answers2