Python list comprehension to join list of lists [duplicate]

Question

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

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

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

Answer 1

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))