Filtering a list based on a list of booleans

Question

I have a list of values which I need to filter given the values in a list of booleans:

list_a = [1, 2, 4, 6]
filter = [True, False, True, False]

Answer 1

With python 3 you can use list_a[filter] to get True values. To get False values use list_a[~filter]