def place_cells_on_array(self, set_of_cells, array):
     """Places cells on array based on the coordinates 
     contained in each cell. Returns array with cells."""
     
     for cell in set_of_cells:
         (x,y) = cell.get_cell_coords()
         array[x][y] = cell
     return array                
 def convert_cells_to_coords(self, set_of_cells):
     """Given a set of cell objects, returns a set of tuples 
     representing the cell\'s coordinates."""
     
     set_of_cell_coords = set()
     for cell in set_of_cells:
         set_of_cell_coords.add(cell.get_cell_coords())
     return set_of_cell_coords