Python | Filter list by Boolean list
Sometimes, while working with Python list, we can have a problem in which we have to filter a list. This can sometimes, come with variations. One such variation can be filtering by the use of Boolean list. Let’s discuss a way in which this task can be done.
Method : Using itertools.compress()
The most elegant and straightforward method to perform this particular task is to use inbuilt functionality of compress() to filter out all the elements from list which exists at Truth positions with respect to index of other list.
# Python3 code to demonstrate working of # Filter list by Boolean list # Using itertools.compress from itertools import compress # initializing list test_list = [6, 4, 8, 9, 10] # printing list print("The original list : " + str(test_list)) # initializing Boolean list bool_list = [True, False, False, True, True] # printing boolean list print("The bool list is : " + str(bool_list)) # Filter list by Boolean list # Using itertools.compress res = list(compress(test_list, bool_list)) # Printing result print("List after filtering is : " + str(res)) |
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Output :
The original list : [6, 4, 8, 9, 10] The bool list is : [True, False, False, True, True] List after filtering is : [6, 9, 10]
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