code: def _node_add_without_peer_container(self, node_sum, child_other):
          '''_node_add_without_peer_container
  
          Low-level api: Apply delta child_other to node_sum when there is no peer
          of child_other can be found under node_sum. child_other is a container
          node. Element node_sum will be modified during the process.
  
          Parameters
          ----------
  
          node_sum : `Element`
              A config node in a config tree.
  
          child_other : `Element`
              A child of a config node in another config tree. This child has no
              peer under node_sum.
  
          Returns
          -------
  
          None
              There is no return of this method.
          '''
  
          e = deepcopy(child_other)
          node_sum.append(self._del_attrib(e)f _node_add_without_peer_container(self, node_sum, child_other):
          '''_node_add_without_peer_container
  
          Low-level api: Apply delta child_other to node_sum when there is no peer
          of child_other can be found under node_sum. child_other is a container
          node. Element node_sum will be modified during the process.
  
          Parameters
          ----------
  
          node_sum : `Element`
              A config node in a config tree.
  
          child_other : `Element`
              A child of a config node in another config tree. This child has no
              peer under node_sum.
  
          Returns
          -------
  
          None
              There is no return of this method.
          '''
  
          e = deepcopy(child_other)
          node_sum.append(self._del_attrib(e))
docs: _node_add_without_peer_container
  
          Low-level api: Apply delta child_other to node_sum when there is no peer
          of child_other can be found under node_sum. child_other is a container
          node. Element node_sum will be modified during the process.
  
          Parameters
          ----------
  
          node_sum : `Element`
              A config node in a config tree.
  
          child_other : `Element`
              A child of a config node in another config tree. This child has no
              peer under node_sum.
  
          Returns
          -------
  
          None
              There is no return of this method.