Update app.py

app.py

@@ -50,7 +50,7 @@ def respond(
             print(event)
             print(type(event))
             print(222222222222)
-            token = choices[0].delta['content']
+            token = event['choices'][0].delta['content']
             if message.find('写一篇关于青春的五言绝句') != -1:
                 print(11111111111)
                 print(token)