[[None, None, None, None, None], [None, None, None, None, None], [None,
    None, None, None, None], [None, None, None, None, None]]
[[None, 4, None, None, None], [None, 4, None, None, None], [None, 4, None,
    None, None], [None, 4, None, None, None]]
Assign value to an individual cell in a two dimensional python array