def createEmptyGrid(grid_dimensions):
    grid = [None] * grid_dimensions
    for x in range(grid_dimensions):
        grid[x] = ['.'] * grid_dimensions
    return grid

def initial_grid(cell_dimensions, density, disease):
    grid = createEmptyGrid(cell_dimensions)
    for cell in grid:
        print ' '.join(cell)

initial_grid(3, 0, 0)