def _config_obj_expiration(self, req):
        delete_at_container = None
        delete_at_part = None
        delete_at_nodes = None

        req = constraints.check_delete_headers(req)

        if req.headers in 'x-delete-at':
            x_delete_at = int(normalize_delete_at_timestamp(
                int(req.headers['x-delete-at'])))

            req.environ.setdefault('swift.log_info', []).append(
                'x-delete-at:%s' % x_delete_at)

            delete_at_container = get_expirer_container(
                x_delete_at, self.app.expiring_objects_container_divisor,
                self.account_name, self.container_name, self.object_name)

            delete_at_part, delete_at_nodes = \
                self.app.container_ring.get_nodes(
                    self.app.expiring_objects_account, delete_at_container)

        return req, delete_at_container, delete_at_part, delete_at_nodes
dataset/ETHPy150Open openstack/swift/swift/proxy/controllers/obj.py/BaseObjectController._config_obj_expiration/swapped operands of `in`