Question

filters are used to find some speacific informatin from list true or false.
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Answer 1

Answer:

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))

Answer 2

Answer:

true because filter means to find out some specific information from the list