如何使用telethon找出谁加入了电报频道

from telethon import TelegramClient, events
import asyncio

# 替换为您的 API ID 和 API Hash
api_id = 'YOUR_API_ID'
api_hash = 'YOUR_API_HASH'
channel_username = 'YOUR_CHANNEL_USERNAME'  # 频道的用户名或 ID

# 创建 Telegram 客户端
client = TelegramClient('session_name', api_id, api_hash)

async def main():
    await client.start()
    
    # 获取频道对象
    channel = await client.get_entity(channel_username)

    # 获取频道的成员
    async for user in client.iter_participants(channel):
        print(f'User ID: {user.id}, Username: {user.username}, Name: {user.first_name} {user.last_name}')

# 运行主函数
with client:
    client.loop.run_until_complete(main())

@client.on(events.ChatAction)
async def handler(event):
    if event.user_joined:
        print(f'{event.user.first_name} has joined the channel.')

# 运行客户端
with client:
    client.run_until_disconnected()