code: def tile_to_path(self, tile):
  		'''return full path to a tile'''
  		return os.path.join(self.cache_path, self.service, tile.path()f tile_to_path(self, tile):
  		'''return full path to a tile'''
  		return os.path.join(self.cache_path, self.service, tile.path())
docs: return full path to a tile