Update app.py

app.py

@@ -25,8 +25,8 @@ def respond(
 
         messages = [{"Role": "system", "Content": default_system}]
         client = OpenAI(
-            api_key=os.environ.get("HUNYUAN_API_KEY"), # 混元 APIKey
-            base_url="https://api.hunyuan.cloud.tencent.com/v1", # 混元 endpoint
+            api_key=os.getenv('HUNYUAN_API_KEY'),
+            base_url="https://api.hunyuan.cloud.tencent.com/v1",
         )
         for val in history:
             if val[0] and val[1]: