python filter list of dictionaries based on key value

Question

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.

Answer 1

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'}]