Update app.py

app.py

@@ -13,12 +13,14 @@
 # https://platform.openai.com/docs/assistants/tools
 
 import gradio as gr
+import pandas as pd
 import yfinance as yf
 
 import json, openai, os, time
 
 from datetime import date
 from openai import OpenAI
+from typing import List
 from utils import function_to_schema, show_json
 
 client = OpenAI(api_key=os.environ.get("OPENAI_API_KEY"))
@@ -32,11 +34,12 @@ def today_tool(text: str) -> str:
        This function always returns today's date."""
     return str(date.today())
 
-def yfinance_download_tool(tickers: List[str], start: date, end: date) -> DataFrame:
-    """Returns stock data for given tickers from a start date to an end date using yfinance download. 
-       Use this function for any questions related to getting stock data. 
-       The input should be the tickers as a list of strings, a start date, and an end date. 
-       This function always returns a Pandas DataFrame."""
+def yfinance_download_tool(tickers: List[str], start: date, end: date) -> pd.DataFrame:
+    """Returns historical stock data for given tickers from a start date to an end date 
+       using the yfinance library download function. 
+       Use this function for any questions related to getting historical stock data. 
+       The input should be the tickers as a List of strings, a start date, and an end date. 
+       This function always returns a pandas DataFrame."""
     return yf.download(tickers, start=start_date, end=end_date)
 
 tools = {