Create (nested) List from two Lists in Python

Question

Hello I would like to create an Array from two Arrays but I do not want to create this new Array, with append() or extend().

Input arrays have the same number of rows and columns:

listone = [1,2,3]
listtwo = [4,5,6]

Outcome we expect:

mergedlist = [[1,4],[2,5],[3,6]]

It can't be done via

mergedlist = listone.append(listtwo) or mergedlist = listone.extend(listtwo)

I would like to get

mergedlist = [[1,4],[2,5],[3,6]]

How can I get the desired output?

This is a simple example to understand, real one has 14 files and 35 rows and the 61 Arrays.

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For one dimensional the answer down is ok, but when you have array of list

listone = [[1,2,3],[1,2,3],[1,2,3]]
listtwo = [4,5,6]

I would like to get

result = [[1,2,3,4],[1,2,3,5],[1,2,3,6]]

when I work with merged = map(list, zip(listone, listtwo))

My result is [[[1, 2, 3], 4], [[1, 2, 3], 5], [[1, 2, 3], 6]] that is Bad

Answer 1

Use the builtin zip function. It's exactly what you want. From the python manuals:

>>> x = [1, 2, 3]
>>> y = [4, 5, 6]
>>> zipped = zip(x, y)
>>> zipped
[(1, 4), (2, 5), (3, 6)]

Or if you want a list of lists, instead of a list of tuples, you use zip with a list comprehension:

>>> zipped = [list(t) for t in zip(x, y)]
>>> zipped
[[1, 4], [2, 5], [3, 6]]

Answer 2

Try:

listone = [1,2,3]
listtwo = [4,5,6]

merged = map(list, zip(listone, listtwo))

zip(listone, listtwo) will return a list of tuples. Since you want a list of lists you need to convert each tuple to a list. map(list, list_of_tuples) call will do exactly that.