code: def get_parent_banks(self, bank_id):
          
          # Implemented from template for
          # osid.resource.BinHierarchySession.get_parent_bins
          if self._catalog_session is not None:
              return self._catalog_session.get_parent_catalogs(catalog_id=bank_id)
          return BankLookupSession(
              self._proxy,
              self._runtime).get_banks_by_ids(
                  list(self.get_parent_bank_ids(bank_id)))
docs: Gets the parents of the given bank.
  
          arg:    bank_id (osid.id.Id): a bank ``Id``
          return: (osid.assessment.BankList) - the parents of the bank
          raise:  NotFound - ``bank_id`` is not found
          raise:  NullArgument - ``bank_id`` is ``null``
          raise:  OperationFailed - unable to complete request
          raise:  PermissionDenied - authorization failure occurred
          *compliance: mandatory -- This method must be implemented.*