This is python. You need numpy. This should only work for 1d arrays but they are the same size. It has to work for every possible variation. so it should work for these examples [1,2,3,4,5,6]+[1,2,3,4,5,6] or [1,2,3,4,5,6,7,8,9,10]+[1,2,3,4,5,6,7,8,9,10]. Same size. all 1d arrays. works for every possible variation of elements.

vector_sum Given two input vectors u and v this function returns the vector result u + v as a 1D array. You may assume that the input vectors are of equal size; no error checking is required. However, do not assume that they are three component vectors; the input can be any size vectors. You must use a loop to compute the sum