Converting a list of lists into a list of strings

Question

In Python how do I convert:

list01 = [ ['a', 'b', 'c'], ['i', 'j', 'k'], ['x', 'y', 'z'] ]

into

list02 = [ 'abc', 'ijk', 'xyz']

Asked By: Mazzone

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Source

Answer 1

Use str.join and a list comprehension:

>>> list01 = [ ['a', 'b', 'c'], ['i', 'j', 'k'], ['x', 'y', 'z'] ]
>>> [''.join(x) for x in list01]
['abc', 'ijk', 'xyz']
>>>

Answered By: user2555451

Answer 2

Using map:

map(''.join, list01)

Or with a list comprehension:

[''.join(x) for x in list01]

Both output:

['abc', 'ijk', 'xyz']

Note that in Python 3, map returns a map object instead of a list. If you do need a list, you can wrap it in list(map(...)), but at that point a list comprehension is more clear.

Answered By: mhlester

Answer 3

>>> map(''.join, list01)
['abc', 'ijk', 'xyz']

Answered By: moliware

Answer 4

You can use join to implode the elements in a string and then append, if you don’t want to use map.

# Your list
someList = [ ['a', 'b', 'c'], ['i', 'j', 'k'], ['x', 'y', 'z'] ]
implodeList = []

# make an iteration with for in
for item in someList:
    implodeList.append(''.join(item))

# printing your new list
print(implodeList)

['abc', 'ijk', 'xyz']

Answered By: afym

Converting a list of lists into a list of strings

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