code: def tile_id_from_coord(coord):
      
      for i, c in _tile_id_to_coord.items():
          if c == coord:
              return i
      raise Exception('Tile id lookup failed, coord={} not found in map'.format(hex(coord)))
docs: Convert a tile coordinate to its corresponding tile identifier.
  
      :param coord: coordinate of the tile, int
      :return: tile identifier, Tile.tile_id