Update app.py

app.py

@@ -329,7 +329,7 @@ def calculate_total_value(username, conn):
 def buy_stock(username, ticker, amount, conn, currency):
     current_price = get_stock_data(ticker, period='1d')
     
-    if current_price is None or current_price empty:
+    if current_price is None or current_price.empty:
         return "Invalid ticker symbol."
     
     total_cost = current_price['Close'].iloc[-1] * amount
@@ -365,7 +365,7 @@ def buy_stock(username, ticker, amount, conn, currency):
 def sell_stock(username, ticker, amount, conn, currency):
     current_price = get_stock_data(ticker, period='1d')
     
-    if current_price is None or current_price empty:
+    if current_price is None or current_price.empty:
         return "Invalid ticker symbol."
     
     total_value = current_price['Close'].iloc[-1] * amount