Update app.py

app.py

@@ -2,6 +2,10 @@ import gradio as gr
 import json, openai, os, time
 from openai import OpenAI
 
+client = None
+assistant = None
+thread = None
+
 def show_json(str, obj):
     print(f"### {str}")
     print(json.loads(obj.model_dump_json()))