Python, concatenation of two list

Question

I am new to python and I need to do this:

lines = ['apple','bear']
signed=['aelpp','aber']

I want the output to be:

res = ['aelpp apple', 'aber bear']

I'd appreciate if you can help! I've tried simply using + and the join() function but not getting what I want.

Christian Tapia · Accepted Answer · 2014-02-16 21:55:19Z

5

You can try using zip() and join():

res = [" ".join(e) for e in zip(signed, lines)]
print res

Output:

['aelpp apple', 'aber bear']

Edit: As @ThiefMaster commented, this can be made more compact using map():

res = map(' '.join, zip(signed, lines))

answered Feb 16, 2014 at 21:49

Christian Tapia

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1 Comment

Could be done in an even more compact way: map(' '.join, zip(signed, lines))

itsjeyd · Accepted Answer · 2014-02-16 21:52:44Z

0

You can use map and zip:

list(map(lambda x: x[1] + ' ' + x[0], zip(lines, signed)))

answered Feb 16, 2014 at 21:52

itsjeyd

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map(lambda ... is always better written as a list comprehension/generator expression.

dparpyani · Accepted Answer · 2014-02-17 11:33:05Z

0

Since you are new to python, you may find the following easier to understand compared to the others:

>>> res = []
>>> for i in range(len(signed)):
...     res.append(signed[i] + ' ' + lines[i])

The results:

>>> print res
['aelpp apple', 'aber bear']

answered Feb 17, 2014 at 11:33

dparpyani

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