def delete_cluster_subnet_group(self, subnet_identifier):
        if subnet_identifier in self.subnet_groups:
            return self.subnet_groups.pop(subnet_identifier)
        raise ClusterSubnetGroupNotFoundError(subnet_identifier)
dataset/ETHPy150Open spulec/moto/moto/redshift/models.py/RedshiftBackend.delete_cluster_subnet_group/original