Update app.py

app.py

@@ -4,8 +4,8 @@ import requests
 import inspect
 import pandas as pd
 from langchain_tavily import TavilySearch
-from langchain.agents import create_react_agent
-from langchain_openai import init_chat_model
+from langgraph.prebuilt import create_react_agent
+from langchain.chat_models import init_chat_model
 # from langchain_sandbox import PyodideSandboxTool
 
 # (Keep Constants as is)