CODEWITHSUNDEEP
python
Talu
Talu

Reputation: 11

Joining two List Elements one by one to make sublists inside a third list

I have two lists of equal length.

The first list consists of 1000 sublists with two elements each e.g 

listone = [[1,2], [1,3], [2,3],...]

My second list consists of 1000 elements e.g.

secondlist = [1,2,3,...]

I want to use these two lists to make my third list consisting 1000 sublists of three elements. I want to have my list in such a fashion that every index is added from secondlist to listone as the third element e.g.

thirdlist = [[1,2,1], [1,3,2], [2,3,3],...]

Upvotes: 0

Views: 91

Answers (3)

user1767754
user1767754

Reputation: 25094

You can use the zip function to combine listOne and second. To get the desired format you have to create a new list using list comprehension 

listOne = [[1,2], [1,3], [2,3]]
secondList = [1,2,3]

thirdList = [x + [y] for x,y in zip(listOne, secondList)]
print thirdList
>>> [[1, 2, 1], [1, 3, 2], [2, 3, 3]]

Upvotes: 1

user3582076
user3582076

Reputation: 1343

you can do:

[x + [y] for x, y in zip(listone, secondlist)]

Upvotes: 1

user94559
user94559

Reputation: 60143

Look into zip:

listone = [[1,2], [1,3], [2,3]]
secondlist = [1,2,3]

thirdlist = [x + [y] for x, y in zip(listone, secondlist)]

print(thirdlist)

# Output:
# [[1, 2, 1], [1, 3, 2], [2, 3, 3]]

Upvotes: 4

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