Explicitly select items from a list or tuple

Question

I have the following Python list (can also be a tuple):

myList = [\'foo\', \'bar\', \'baz\', \'quux\']

I can say

>>&g         


        

Answer 1

like often when you have a boolean numpy array like mask

[mylist[i] for i in np.arange(len(mask), dtype=int)[mask]]

A lambda that works for any sequence or np.array:

subseq = lambda myseq, mask : [myseq[i] for i in np.arange(len(mask), dtype=int)[mask]]

newseq = subseq(myseq, mask)