Update rag_langgraph.py

rag_langgraph.py

@@ -2,7 +2,7 @@ from typing import Annotated, List, Tuple, Union
 
 from langchain_community.tools.tavily_search import TavilySearchResults
 from langchain_core.tools import tool
-from langchain_experimental.utilities import PythonREPL
+from langchain_experimental.tools import PythonREPLTool
 
 from langchain.agents import AgentExecutor, create_openai_tools_agent
 from langchain_core.messages import BaseMessage, HumanMessage
@@ -48,7 +48,7 @@ class AgentState(TypedDict):
     
 def run_multi_agent(prompt):
     tavily_tool = TavilySearchResults(max_results=5)
-    repl = PythonREPL()
+    python_repl_tool = PythonREPLTool()
 
     members = ["Researcher", "Coder"]
     system_prompt = (