code: def remove(self):
          
          if not self._is_item:
              raise TypeError("Should be called on an item, not ListNode's itself.")
          self.container.node_stack.remove(self)
docs: Removes an item from ListNode.
  
          Raises:
              TypeError: If it's called on container ListNode (intstead of ListNode's item)
  
          Note:
              Parent object should be explicitly saved.