Concatenate strings at the same indexes in two lists

Question

I have two lists and I'd like to combine them following the same order.

Below is the question.

A = ['1,2,3','4,5,6','7,8,9']
B = ['10','11','12']

To get a new list such as below

A+B = ['1,2,3,10','4,5,6,11','7,8,9,12']

I try extend, zip, append, enumerate but could not get what I want. Two loops the result will repeat.

Any hint or elegant way to do this please?

Answer 1

A and B are lists of strings. Using zip, you can create pairs like ('1,2,3', '10'). Afterwards you can combine these two strings using join.

A = ['1,2,3','4,5,6','7,8,9']
B = ['10','11','12']

C = [','.join(z) for z in zip(A, B)]
print C

Answer 2

Just use ','.join and zip..

A = ['1,2,3','4,5,6','7,8,9']
B = ['10','11','12']

C = [ ','.join(pair) for pair in zip(A,B) ]