Update app.py

app.py

@@ -19,7 +19,7 @@ def get_weather(city: str) -> str:
     Returns:
         str: A string containing the weather information or an error message.
     """
-    api_key = os.getenv('API_KEY') 
+    api_key = os.getenv('WEATHER_API_KEY') 
     if not api_key:
         return "Error: API Key not found in environment variables."