code: async def close_room(self, room, namespace=None):
          
          namespace = namespace or '/'
          self.logger.info('room %s is closing [%s]', room, namespace)
          await self.manager.close_room(room, namespace)
docs: Close a room.
  
          This function removes all the clients from the given room.
  
          :param room: Room name.
          :param namespace: The Socket.IO namespace for the event. If this
                            argument is omitted the default namespace is used.
  
          Note: this method is a coroutine.