def delete_cluster_security_group(self, security_group_identifier):
        if self.security_groups in security_group_identifier:
            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/swapped operands of `in`