Using "chats" argument in telethon.events

user_8323650 0
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I'm running this:

from telethon import TelegramClient, events
from telethon.tl.types import PeerChat, PeerChannel

@client.on(events.ChatAction(chats=[PeerChannel(-1001244988104)]))
async def handle_chat_action(event):
    print(event)
    print(event.user_left)

@client.on(events.NewMessage(chats=[PeerChat(-100123456789)]))
async def my_event_handler(event):
    print(event.raw_text)

client.start()
client.run_until_disconnected()

But, not getting updates, why? What's wrong here?

At first, I tried chats=[-100123456] (without PeerChat), but did not get updates...

telegram telethon python-3.x python
1 Answers

You should not mix the concept of "marked IDs" and Peer instances together. You can use:

@client.on(events.NewMessage(chats=[PeerChannel(123456789)]))
async def my_event_handler(event):
    print(event.raw_text)

Or:

@client.on(events.NewMessage(chats=[-100123456789]))
async def my_event_handler(event):
    print(event.raw_text)

But not both.

  • The -100 prefix tells Telethon it's a Channel (megagroups, also known as supergroups, are also Channel).
  • The - prefix tells Telethon it's a Chat.
  • The + prefix tells Telethon it's a User.

This follows the same convention as the Telegram HTTP Bot API.

If you don't use a prefix, Telethon will look in cache for all types. If it's not in cache, it will attempt to use a User.

If you use a prefix, Telethon will only get that type from cache. If it's not in cache, it will attempt to use the type your prefix says.

Internally,

-100123 == PeerChannel(123)
-123 == PeerChat(123)
123 == PeerUser(123)

event.chat_id, event.user_id, client.get_peer_id all return prefixed IDs because it's helpful for the library and convenient for the user.

Updates are the "raw" objects from Telegram and those are the original, real values.

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