Pythonリストのリストを結合するリストの内包表記

Question

与えられたlists = [['hello'], ['world', 'foo', 'bar']]

それを文字列の単一のリストに変換するにはどうすればよいですか？

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

Answer 1

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

または：

import itertools

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

Answer 2

from itertools import chain

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