code: def modify_distribution_list(self, dl_description, attrs):
          
          attrs = [{'n': k, '_content': v} for k, v in attrs.items()]
          self.request('ModifyDistributionList', {
              'id': self._get_or_fetch_id(dl_description,
                                          self.get_distribution_list),
              'a': attrs
          })
docs: :param dl_description : a DistributionList specifying either :
                     - id:   the dl_list_id
                     - dl_description: the name of the list
          :param attrs  : a dictionary of attributes to set ({key:value,...})