How do I make a list concatenating the corresponding elements of two lists of strings in Python?

Question

I want to make a new list concatenating the corresponding elements of lists of equal-sized strings. For instance, for

list1 = ["a","b","c"]
list2 = ["d","e","f"]

, the output should be

["ad", "be", "cf"]

You are getting some quality answers for your question, but for future reference, do remember to include some information about what *you* already tried to solve a given problem in your questions. Related/bordering on duplicate: [Joining two lists into tuples in python](http://stackoverflow.com/q/21196165/1199226) — itsjeyd, Apr 23 '14 at 08:04

score 4 · Answer 1 · answered Apr 23 '14 at 07:59

4

>>> from operator import add
>>> one = ["a", "b", "c"]
>>> two = ["d", "e", "f"]
>>> map(add, one, two)
['ad', 'be', 'cf']

answered Apr 23 '14 at 07:59

Ashwini Chaudhary

you can use `str.__add__` instead of importing add operator – Elisha Apr 23 '14 at 08:00
@Elisha Indeed, but for bigger lists it can be a little slower. – Ashwini Chaudhary Apr 23 '14 at 08:08
doesn't `add` operator just uses `str.__add__` ? – Elisha Apr 23 '14 at 08:14
1

@Elisha Internally yes, but explicit calls to these special methods is always slower than implicit calls. – Ashwini Chaudhary Apr 23 '14 at 08:20

score 3 · Answer 2 · answered Apr 23 '14 at 07:57

3

Firstly, your chars should be in single/double quotes:

listone = ['a', 'b', 'c']
listtwo = ['d', 'e', 'f']

Then you can do:

listthree = [i+j for i,j in zip(listone,listtwo)]

>>> print listthree
['ad', 'be', 'cf']

answered Apr 23 '14 at 07:57

sshashank124

score 2 · Answer 3 · answered Apr 23 '14 at 07:59

2

You can use list comprehension and the zip() method-

print [m + n for m, n in zip(listone, listtwo)]

answered Apr 23 '14 at 07:59

gravetii

score 1 · Answer 4 · answered Apr 23 '14 at 08:12

1

you can also use join instead of +

print [''.join(x) for x in zip(listone, listtwo)]

answered Apr 23 '14 at 08:12

yejinxin

4 Answers4