class grid:
def __init__(self, width = 7, height = 4):
self.spots = [bytearray(width) for x in range(height)]
canvas = grid(7, 4)
canvas.spots[0][3] = 1
canvas.spots[1][2] = 1; canvas.spots[1][4] = 1
canvas.spots[2][1] = 1; canvas.spots[2][5] = 1
(canvas.spots[3][x] = 1 for x in range(7))