Update app.py

app.py

@@ -62,13 +62,16 @@ def fetch_data(symbol='ETHUSDT', interval='1h', start_date='2021-01-01'):
     while start_date < end_date:
         url = f'https://api.binance.com/api/v3/klines?symbol={symbol}&interval={interval}&startTime={int(start_date.timestamp() * 1000)}'
         response = requests.get(url)
+        if response.status_code != 200:
+            print(f"Error fetching data: {response.status_code} {response.text}")
+            break
         data = response.json()
         if not data:
             print("Fetched data is empty. Please check the API request and parameters.")
             break
         else:
             print("Fetched data successfully.")
-            print(data.head())
+            print(data
         klines += data
         start_date = datetime.utcfromtimestamp(data[-1][6] / 1000)