def delete_cluster_security_group(self, security_group_identifier):
        if security_group_identifier in self.security_groups:
            return self.security_groups.pop(security_group_identifier)
        raise ClusterSecurityGroupNotFoundError(security_group_identifier)
dataset/ETHPy150Open spulec/moto/moto/redshift/models.py/RedshiftBackend.delete_cluster_security_group/original