基于键值的python过滤器列表 [英] python filter list of dictionaries based on key value

问题描述

我有一个字典列表，每个字典都有一个键（我们说）'type'，它的值可以是'type1'，'type2'等等。我的目标是将这些字典过滤掉为相同词典的列表，但只能将某些类型的字典过滤掉。我想我只是真的在努力与列表/字典理解。

所以一个示例列表将如下所示：

  exampleSet = [ {'type'：'type1'}，{'type'：'type2'}，{'type'：'type2'}，{'type'：'type3'} 
  

我有一个键值列表。例如：

  keyValList = ['type2'，'type3'] 
  

预期结果列表将如下所示：

  expectedResult = [{'type'：'type2'}，{'type'：'type2'}，{'type'：'type3'}] 
  

我知道我可以用一套for循环来做到这一点。我知道有一个更简单的方法。我发现这个问题有很多不同的口味，但没有一个真的适合这个法案，并回答了这个问题。我会在答案中发表一个尝试，但他们并没有那么令人印象深刻。可能最好让它开放。任何协助将不胜感激。

解决方案

您可以尝试列表comp

 code>>>> example ='type2'}，{'type'：'type2'}，{'type'：'type3'}] 
>> ;> keyValList = ['type2'，'type3'] 
>>> expectedResult = [d for example in exampleSet if d ['type'] in keyValList] 
>>>> expectedResult 
 [{'type'：'type2'}，{'type'：'type2'}，{'type'：'type3'}] 
  

另一种方法是使用 过滤器

 >>>列表（key）中的filter（lambda d：d ['type']）
 [{'type'：'type2'}，{'type'：'type2'}，{'type' type3'}] 
  

I have a list of dictionaries and each dictionary has a key of (let's say) 'type' which can have values of 'type1', 'type2', etc. My goal is to filter out these dictionaries into a list of the same dictionaries but only the ones of a certain "type". I think i'm just really struggling with list/dictionary comprehensions.

so an example list would look like:

exampleSet = [{'type':'type1'},{'type':'type2'},{'type':'type2'}, {'type':'type3'}]

i have a list of key values. lets say for example:

keyValList = ['type2','type3']

where the expected resulting list would look like:

expectedResult = [{'type':'type2'},{'type':'type2'},{'type':'type3'}]

I know i could do this with a set of for loops. I know there has to be a simpler way though. i found a lot of different flavors of this question but none that really fit the bill and answered the question. I would post an attempt at the answer... but they weren't that impressive. probably best to leave it open ended. any assistance would be greatly appreciated.

解决方案

You can try a list comp

>>> exampleSet = [{'type':'type1'},{'type':'type2'},{'type':'type2'}, {'type':'type3'}]
>>> keyValList = ['type2','type3']
>>> expectedResult = [d for d in exampleSet if d['type'] in keyValList]
>>> expectedResult
[{'type': 'type2'}, {'type': 'type2'}, {'type': 'type3'}]

Another way is by using filter

>>> list(filter(lambda d: d['type'] in keyValList, exampleSet))
[{'type': 'type2'}, {'type': 'type2'}, {'type': 'type3'}]

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