Filtering a list based on a list of booleans

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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]

I generate a new filtered list with the following line:

filtered_list = [i for indx,i in enumerate(list_a) if filter[indx] == True]

which results in:

print filtered_list
[1,4]

The line works but looks (to me) a bit overkill and I was wondering if there was a simpler way to achieve the same.

Advices

Summary of two good advices given in the answers below:

1- Don"t name a list filter like I did because it is a built-in function.

2- Don"t compare things to True like I did with if filter[idx]==True.. since it"s unnecessary. Just using if filter[idx] is enough.

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