Matrix understanding in Python

[RavCOder]

I think about when scrolling through the list finds the number 0 and make it number 1, but my problem is how do I scroll an array of an array. the indexes I think are just the lists of matrix.

 matrix =   [[1, 0, 0, 0, 1], # matrix[0] index
             [0, 0, 0, 0, 0], # matrix[1] index
             [0, 1, 0, 0, 0], # matrix[2] index
             [0, 1, 0, 0, 0]] # matrix[3] index

I should do something like that (I know my logic is wrong and my syntax is also)

for i in zip(*list_zombies_human):
  print(i)

for j , n in i:
  if j == 1:
    i[n] = 0
print(j)