PYTHON QUESTION

Given a non-empty list of ints, return a new list containing the elements from the original list that come before the first 4 in the original list. The original list will contain at least one 4. Note that it is valid to create a list of length 0.

pre4([1, 2, 4, 1]) [1, 2] pre4([3, 1, 4]) [3, 1] pre4([1, 4, 4]) [1]