How to fill,0,0,0,0,… with the repeating patterns in matrix in python

Question

matrix = np.array([[1, 2, 1, 4, 1, 6, 1, 8, 1, 2, 1, 4, 1, 6, 1, 8, 1, 2, 1, 4, 1, 6, 1, 8, 1, 2, 1, 4, 1]
 ,[2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2