Update app.py

update return format for stock price search

app.py

@@ -13,7 +13,7 @@ from Gradio_UI import GradioUI
 @tool
 def get_stock_price(ticker_symbol:str, time_period:str)-> str: #it's import to specify the return type
     #Keep this format for the description / args / args description but feel free to modify the tool
-    """A tool that searches for the historic price of a stock symbol given the symbol ticker name and a period.
+    """A tool that searches for the historic price of a stock symbol given the symbol ticker name and a period. IT will return in a csv string format.
     Args:
         ticker_symbol: A string representing a stock symbol (e.g., 'AAPL')
         time_period: A string representing the time period for pricing. Valid options are 1d, 5d, 1mo, 3mo, 6mo, 1y,2y, 5y, 10y and ytd the current timezone
@@ -21,7 +21,7 @@ def get_stock_price(ticker_symbol:str, time_period:str)-> str: #it's import to s
     try:
         data = yf.Ticker(ticker_symbol)
         historic_price = data.history(period=time_period)        
-        return historic_price.to_string()
+        return historic_price.to_csv()
     except Exception as e:
         return f"Error getting the price for {ticker_symbol}: {str(e)}"