Python compréhension de la liste pour rejoindre la liste des listes

Question

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

Comment puis-je transformer cela en une seule liste de chaînes?

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

Answer 1

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

Ou:

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)]