code: def delete(self, session_key=None):
          
  
          if session_key is None:
              if self.session_key is None:
                  return
              session_key = self.session_key
  
          self.table.delete_item(Key={'session_key': session_key})
docs: Deletes the current session, or the one specified in ``session_key``.
  
          :keyword str session_key: Optionally, override the session key
              to delete.