python - Python列表推导加入列表列表

Question

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

如何将其转换为单个字符串列表？

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

Answer 1

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

或者：

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)]