Update app.py

app.py

@@ -45,7 +45,7 @@ def drop_namespace():
   print("Function executed after delay!")
 
 def generate_key():
-    unique_key = uuid.uuid1()
+    unique_key = str(uuid.uuid1())
     unique_key = 'User_' + unique_key
     timer = threading.Timer(10, drop_namespace) 
     timer.start()