concat two lists in a list of lists

Question

Is it possible to concat two lists in a list of lists?
From:

listA = ['a', 'b', 'c']
listB = ['A', 'B', 'C']
listFull = listA + listB

To:

print(listFull)
[['a', 'A'],['b', 'B'],['c', 'C']]

Asked By: null92

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Source

Answer 1

"Concatenate" is what the + does, which puts one list after another. What you’re describing is called a "zip" operation, and Python has exactly that function built-in.

zip returns an iterable, so if you want a list, you can call list on it.

print(list(zip(listA, listB)))
# Output: [('a', 'A'), ('b', 'B'), ('c', 'C')]

Answered By: Silvio Mayolo

Answer 2

List comprehension using zip()

listFull = [list(x) for x in zip(listA, listB)]
print(listFull)

You can also use map() without looping

listFull = list(map(list, zip(listA, listB)))

[['a', 'A'],['b', 'B'],['c', 'C']]

Answered By: Jamiu S.

Answer 3

there are several ways to achieve this.
you either need atleast 1 for loop or a map/zip combination.
both possibilities here:

listA = ['a', 'b', 'c']
listB = ['A', 'B', 'C']
#1
listFull =[]
for i in range(len(listA)):
    listFull.append([listA[i],listB[i]])
print(listFull)
# output [['a', 'A'], ['b', 'B'], ['c', 'C']]

#2
listfull2 = list(map(list,zip(listA,listB)))
print(listfull2)
# output [['a', 'A'], ['b', 'B'], ['c', 'C']]

Answered By: tetris programming

concat two lists in a list of lists

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