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How to concatenate two lists of strings in Python

I have two lists of string:

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

I have to quote:

['ad', 'be', 'cf']

What's the most pythonic way to do this?

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5 answers


Perhaps zip

:

c = [''.join(item) for item in zip(a,b)]

You can also put multiple subscriptions in one big iterable and use an operator *

to unpack it, passing each sublist as a separate argument to zip

:



big_list = (a,b)
c = [''.join(item) for item in zip(*biglist)]

You can even use the *

c operator zip

to jump in the other direction:

>>> list(zip(*c))
[('a', 'b', 'c'), ('d', 'e', 'f')]
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you can use zip 



>>> a = ['a', 'b', 'c']
>>> b = ['d', 'e', 'f']

>>> [ai+bi for ai,bi in zip(a,b)]

['ad', 'be', 'cf']
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What about:

[c + d for c,d in zip(a,b)]
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You can use zip :

zip(a,b)
[('a', 'd'), ('b', 'e'), ('c', 'f')]

[x+y for x,y in zip(a,b)]
['ad', 'be', 'cf']

You can also use an enum combo:

[j+b[i] for i,j in enumerate(a)]
['ad', 'be', 'cf']
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You can use lambda

together with map

:

map(lambda x,y:x+y,a,b)

Or add zip

to manage more than two lists:

map(lambda x:''.join(x), zip(a,b,c))

For python <3 I would prefer the former option or replace zip()

with izip()

, for python 3 this change is not required ( zip

already returns an iterator).

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