code: def NewDefaultAgency(self, **kwargs):
      
      agency = self._gtfs_factory.Agency(**kwargs)
      if not agency.agency_id:
        agency.agency_id = util.FindUniqueId(self._agencies)
      self._default_agency = agency
      self.SetDefaultAgency(agency, validate=False)  # Blank agency won't validate
      return agency
docs: Create a new Agency object and make it the default agency for this Schedule