diff --git a/python_tests/test_api.py b/python_tests/test_api.py
index 6828b83d..51017ac8 100644
--- a/python_tests/test_api.py
+++ b/python_tests/test_api.py
@@ -8,8 +8,8 @@ from optuna import get_all_study_summaries
 from optuna.study import StudyDirection
 from optuna_dashboard._app import create_app
 from optuna_dashboard._app import create_new_study
-from optuna_dashboard.preferential import create_study
 from optuna_dashboard._preference_setting import register_output_component
+from optuna_dashboard.preferential import create_study
 
 from .wsgi_client import send_request
 
diff --git a/python_tests/test_preference_setting.py b/python_tests/test_preference_setting.py
index 05727a04..033a9092 100644
--- a/python_tests/test_preference_setting.py
+++ b/python_tests/test_preference_setting.py
@@ -1,13 +1,11 @@
 from __future__ import annotations
+
 from unittest import TestCase
 
 import optuna
-
-from optuna_dashboard._preference_setting import (
-    register_output_component,
-    _SYSTEM_ATTR_FEEDBACK_ARTIFACT_KEY,
-    _SYSTEM_ATTR_FEEDBACK_COMPONENT_TYPE,
-)
+from optuna_dashboard._preference_setting import _SYSTEM_ATTR_FEEDBACK_ARTIFACT_KEY
+from optuna_dashboard._preference_setting import _SYSTEM_ATTR_FEEDBACK_COMPONENT_TYPE
+from optuna_dashboard._preference_setting import register_output_component
 from optuna_dashboard.preferential._study import PreferentialStudy