Update app.py

app.py

@@ -1,6 +1,7 @@
 import asyncio
 import json
 from websockets.server import serve
+import traceback
 import time
 
 print("-------")
@@ -48,8 +49,8 @@ async def echo(websocket):
                     b.update({jm["token"]: []})
                 b[jm["token"]].append(jm["data"])
                 json.dump(b, open("b.json", "w"))
-        except Exception as e:
-            print(e)
+        except Exception:
+            traceback.print_exc()
             print(message)
             print(p)
             print(b)