docs: def extend_list(self, data, parsed_args):
          """Add subnet information to a network list."""
          neutron_client = self.get_client()
          search_opts = {'fields': ['id', 'cidr']}
          if self.pagination_support:
              page_size = parsed_args.page_size
              if page_size:
                  search_opts.update({'limit': page_size})
          subnet_ids = []
          for n in data:
              if 'subnets' in n:
                  subnet_ids.extend(n['subnets'])
  
          def _get_subnet_list(sub_ids):
              search_opts['id'] = sub_ids
              return neutron_client.list_subnets(
                  **search_opts).get('subnets', [])
  
          try:
              subnets = _get_subnet_list(subnet_ids)
          except exceptions.RequestURITooLong as uri_len_exc:
              # The URI is too long because of too many subnet_id filters
              # Use the excess attribute of the exception to know how many
              # subnet_id filters can be inserted into a single request
              subnet_count = len(subnet_ids)
              max_size = ((self.subnet_id_filter_len * subnet_count) -
                          uri_len_exc.excess)
              chunk_size = max_size // self.subnet_id_filter_len
              subnets = []
              for i in range(0, subnet_count, chunk_size):
                  subnets.extend(
                      _get_subnet_list(subnet_ids[i: i + chunk_size]))
  
          subnet_dict = dict([(s['id'], s) for s in subnets])
          for n in data:
              if 'subnets' in n:
                  n['subnets'] = [(subnet_dict.get(s) or {"id": s})
                                  for s in n['subnets']]