Python列表理解加入列表清单

Question

鉴于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)]