diff --git a/examples/st_game/memory/scratch.py b/examples/st_game/memory/scratch.py
index 6fc687901..b4036f839 100644
--- a/examples/st_game/memory/scratch.py
+++ b/examples/st_game/memory/scratch.py
@@ -6,12 +6,7 @@ from datetime import datetime, timedelta
 from pathlib import Path
 from typing import Optional, Union
 
-from pydantic import (
-    BaseModel,
-    Field,
-    field_serializer,
-    field_validator,
-)
+from pydantic import BaseModel, Field, field_serializer, field_validator
 
 from metagpt.utils.common import read_json_file, write_json_file