Telethon事件不会出错但也不会打印

如何解决Telethon事件不会出错但也不会打印

因此，我尝试使用event.userUpdate，由于某种原因，它不起作用。 该脚本不会带来任何错误，但也不会打印任何状态更改。 有谁知道为什么吗？

from telethon.sync import TelegramClient
from telethon import events
from datetime import datetime
import time

### Client Side ###
target = ""
phone = "+"
api_id = 
api_hash = ""
client = TelegramClient(phone,api_id,api_hash)
client.start()

if client.is_user_authorized():
    print("Logging in to Telegram complete.")
else:
    client.send_code_request(phone)
    client.sign_in(phone,input('Enter the code: '))

time.sleep(2)
print(f"Started listening to {target}'s status...")

@client.on(events.UserUpdate())
async def handler(event):
  event.user_id = target
  if event.online:
    print(f"{target} went Online at : {datetime.Now()}")
  else:
    print(f"{target} went Offline at : {datetime.Now()}")
  if event.typing:
    print(f"{target} was typing at : {datetime.Now()}")
client.run_until_disconnected()