diff --git a/metagpt/actions/di/execute_nb_code.py b/metagpt/actions/di/execute_nb_code.py
index 91480d3a7..f3dfd1601 100644
--- a/metagpt/actions/di/execute_nb_code.py
+++ b/metagpt/actions/di/execute_nb_code.py
@@ -85,12 +85,12 @@ class ExecuteNbCode(Action):
         )
         self.reporter = NotebookReporter()
         self.set_nb_client()
-        self._init_called = False
+        self.init_called = False
 
-    async def _init_code(self):
-        if not self._init_called:
+    async def init_code(self):
+        if not self.init_called:
             await self.run(INI_CODE)
-            self._init_called = True
+            self.init_called = True
 
     def set_nb_client(self):
         self.nb_client = RealtimeOutputNotebookClient(
diff --git a/metagpt/roles/di/data_analyst.py b/metagpt/roles/di/data_analyst.py
index 5040385ea..2b1bb10b1 100644
--- a/metagpt/roles/di/data_analyst.py
+++ b/metagpt/roles/di/data_analyst.py
@@ -64,7 +64,7 @@ class DataAnalyst(RoleZero):
         """Write a code block for current task and execute it in an interactive notebook environment."""
         counter = 0
         success = False
-        await self.execute_code._init_code()
+        await self.execute_code.init_code()
 
         # plan info
         plan_status = self.planner.get_plan_status()