Menu
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.
313
To sort a list of dictionaries according to the value of the specific key, specify the key parameter of the sort() method or the sorted() function. By specifying a function to be applied to each element of the list, it is sorted according to the result of that function.
We can easily search a list of dictionaries for an item by using the filter() function with a lambda function. In Python3, the filter() function returns an object of the filter class. We can convert that object into a list with the list() function.
A Python dictionary is a collection of key-value pairs where each key is associated with a value. A value in the key-value pair can be a number, a string, a list, a tuple, or even another dictionary. In fact, you can use a value of any valid type in Python as the value in the key-value pair.
Filter a Dictionary by values in Python using filter() filter() function iterates above all the elements in passed dict and filter elements based on condition passed as callback.
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'}] If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
