Update app.py

app.py

@@ -7,7 +7,7 @@ import inspect
 import pandas as pd
 #model requirement
 from smolagents import DuckDuckGoSearchTool, load_tool, tool, CodeAgent,InferenceClientModel
-from typing import TypedDict, List, Dict, Any, Optional
+from typing import TypedDict, List, Dict, Any, Optional,Callable
 from langgraph.graph import StateGraph, END
 from langchain_openai import ChatOpenAI
 from langchain_core.messages import HumanMessage
@@ -101,7 +101,7 @@ def web_search(query: str) -> str:
     return f"Search results for '{query}' : {result}."
 
 @tool
-def wikipedia_tool(query: str, llm: Optional[callable[[str], str]] =openrouter_inference) -> str:
+def wikipedia_tool(query: str, llm: Optional[Callable[[str], str]] =openrouter_inference) -> str:
     """
     Searches Wikipedia for the given query and uses the LLM to extract a direct answer.
     Args: