code: def node_as_tree(
          self,
          node,
          visitor=lambda self, node: self._default_node_visitor(node),
          children=lambda self, node, visitor, children: self._default_node_children(
              node, visitor, children
          ),
      ):
          
          tree = visitor(self, node)
          tree.update(children(self, node, visitor, children))
          return tree
docs: Visits a :class:`CTENode` `node` and delegates to the (optional)
              `visitor` callback, as well as the (optional) `children` callback,
              in order to generate a dictionary representation of the node along
              with its children nodes.
  
              :param node: the :class:`CTENode` for which to generate the
                  representation.
  
              :param visitor: optional function responsible for generating the
                  dictionary representation of the node.
  
              :param children: optional function responsible for generating a
                  children key and list for the node.
  
              :return: a dictionary representation of the structure of the node
                  and its descendant tree.