code: def items(self, region_codes, include_subregions=False):
          
          items = OrderedDict()
          for code in region_codes:
              try:
                  items[code] = self.region_registry[code]
              except KeyError:
                  continue
              if include_subregions:
                  items.update(self.get_subregions(code))
          return items
docs: Returns calendar classes for regions
  
          :param region_codes list of ISO codes for selected regions
          :param include_subregions boolean if subregions
          of selected regions should be included in result
          :rtype dict
          :return dict where keys are ISO codes strings
          and values are calendar classes