如何在Python中展平嵌套列表？

Question

我的清单是：

 [['kukatpally'], ['gachibowli'], ['Madhapur'], ['Chintal'],........]

我想表现得像这样

 ['kukatpally', 'gachibowli', 'Madhapur', 'Chintal',....]

那么如何删除那些“[”和“]”符号。。你知道吗

提前谢谢

Answer 1

假设您的意思是子列表可能包含多个项：

 >>> ls = [['kukatpally'], ['gachibowli'], ['Madhapur'], ['Chintal']]
 >>> new_list = [item for sublist in ls for item in sublist]
 >>> new_list
 ['kukatpally', 'gachibowli', 'Madhapur', 'Chintal']

Answer 2

>>> ls = [['kukatpally'], ['gachibowli'], ['Madhapur'], ['Chintal']]
>>> l = [x[0] for x in ls]
>>> l
['kukatpally', 'gachibowli', 'Madhapur', 'Chintal']
>>> 

Answer 3

使用itertools.chain：

import itertools

l = [['kukatpally', 'somethingelse'], ['gachibowli'], ['Madhapur'], ['Chintal']]

list(itertools.chain(*l))
>> ['kukatpally', 'somethingelse', 'gachibowli', 'Madhapur', 'Chintal']

或itertools.chain.from_iterable

import itertools

l = [['kukatpally', 'somethingelse'], ['gachibowli'], ['Madhapur'], ['Chintal']]

list(itertools.chain.from_iterable(l))
>> ['kukatpally', 'somethingelse', 'gachibowli', 'Madhapur', 'Chintal']