code: def add_reciprocal_link(self, target, weight):
          
          # Generalize ``target`` to a list
          if not isinstance(target, list):
              target_list = [target]
          else:
              target_list = target
          for t in target_list:
              self.add_link(t, weight)
              t.add_link(self, weight)
docs: Add links pointing in either direction between ``self`` and ``target``.
  
          This creates a ``Link`` from ``self`` to ``target`` and a ``Link``
          from ``target`` to ``self`` of equal weight. If ``target`` is a list
          of ``Node`` 's, repeat this for each one.
  
          Args:
              target (Node or list[Node]):
              weight (int or float):
  
          Returns: None
  
          Example:
              >>> node_1 = Node('One')
              >>> node_2 = Node('Two')
              >>> node_1.add_reciprocal_link(node_2, 5)
              >>> new_link_1 = node_1.link_list[0]
              >>> new_link_2 = node_2.link_list[0]
              >>> print(new_link_1)
              node.Link instance pointing to node with value "Two" with weight 5
              >>> print(new_link_2)
              node.Link instance pointing to node with value "One" with weight 5