code: def socket(self, socket_type, identity=None, mechanism=None):
          
          socket = Socket(
              context=self,
              socket_type=socket_type,
              identity=identity,
              mechanism=mechanism,
              loop=self.loop,
          )
          self.register_child(socket)
          return socket
docs: Create and register a new socket.
  
          :param socket_type: The type of the socket.
          :param loop: An optional event loop to associate the socket with.
  
          This is the preferred method to create new sockets.