diff --git a/examples/write_teaching_plan.py b/examples/write_teaching_plan.py
index 191547193..c3a647b94 100644
--- a/examples/write_teaching_plan.py
+++ b/examples/write_teaching_plan.py
@@ -5,15 +5,18 @@
 @Author  : mashenquan
 @File    : write_teaching_plan.py
 @Desc: Write teaching plan demo
+    ```
+        export PYTHONPATH=$PYTHONPATH:$PWD
+        python examples/write_teaching_plan.py <lesson filename> --language=Chinese --teaching_language=English
+
+    ```
 """
 
 import asyncio
 from pathlib import Path
-import sys
 
 from metagpt.config import CONFIG
 
-sys.path.append(str(Path(__file__).resolve().parent.parent))
 import aiofiles
 import fire
 from metagpt.logs import logger
diff --git a/metagpt/actions/action.py b/metagpt/actions/action.py
index 5cf4f3d81..c38c4e1b0 100644
--- a/metagpt/actions/action.py
+++ b/metagpt/actions/action.py
@@ -6,6 +6,7 @@
 @File    : action.py
 @Modified By: mashenquan, 2023/8/20. Add function return annotations.
 """
+from __future__ import annotations
 from abc import ABC
 from typing import Optional
 
diff --git a/metagpt/actions/skill_action.py b/metagpt/actions/skill_action.py
index fb801b454..3ef0087fc 100644
--- a/metagpt/actions/skill_action.py
+++ b/metagpt/actions/skill_action.py
@@ -6,7 +6,7 @@
 @File    : skill_action.py
 @Desc    : Call learned skill
 """
-
+from __future__ import annotations
 import ast
 import importlib
 import traceback