Python list comprehension to join list of lists

Question

Given lists = [['hello'], ['world', 'foo', 'bar']]

How do I transform that into a single list of strings?

combinedLists = ['hello', 'world', 'foo', 'bar']

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Answer 1

from itertools import chain

combined = [['hello'], ['world', 'foo', 'bar']]
single = [i for i in chain.from_iterable(combined)]

Answered By: akira

Answer 2

lists = [['hello'], ['world', 'foo', 'bar']]
combined = [item for sublist in lists for item in sublist]

Or:

import itertools

lists = [['hello'], ['world', 'foo', 'bar']]
combined = list(itertools.chain.from_iterable(lists))

Answered By: Nicolas

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