Python:字典列表，如何获取列表中多个项目的特定键的值? [英] Python: list of dictionaries, how to get values of a specific key for multiple items of the list?

问题描述

我有一个像这样的词典列表:

I have a list of dictionaries like:

dict_list = [{'key1': 'dict1_value1', 'key2': 'dict1_value2', 'key3': 'dict1_value3'},
{'key1': 'dict2_value1', 'key2': 'dict2_value2', 'key3': 'dict2_value3'},
{'key1': 'dict3_value1', 'key2': 'dict3_value2', 'key3': 'dict3_value3'},
{'key1': 'dict4_value1', 'key2': 'dict4_value2', 'key3': 'dict4_value3'},
{'key1': 'dict5_value1', 'key2': 'dict5_value2', 'key3': 'dict5_value3'}]

为第二个列表项获取"key3"的值就像:

getting the value for 'key3' for the second list item is like:

dict_list[1]['key3']
dict2_value3

以及下面的代码从列表中返回项目2:4:

and also the code below returns items 2:4 from the list:

dict_list[1:3]

如果我想从列表中获取多个项目的'key3'值，该怎么办.喜欢

What if I want to get values for 'key3' for multiple items from the list. like

dict_list[1:3]['key3']

类似于我们在MATLAB中所做的事情.

something similar to what we do in MATLAB.

推荐答案

>>> [x.get('key3') for x in dict_list[1:3]]
['dict2_value3', 'dict3_value3']

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