[Python] Is there a way to get the topic(thread) ID from a Message object in Telethon?

I am trying to get all messages from a supergroup in Telegram with every message's sender name and topic name in a text file using telethon, but I can't find how to get the topic ID from a Message object.

msg.reply_to.reply_to_top_id has reply_to, which contains topic ID, only if msg is a reply to another message. GetForumTopicsByIDRequest or GetForumTopicsRequest have only the last message in the topic and its ID

from telethon.sync import TelegramClient

api_id = ...
api_hash = "..."
group_id = ...

client = TelegramClient('anon_session', api_id, api_hash)
client.start()

with client:
with open("all_messages.txt", "w", encoding="utf-8") as f:
for msg in client.iter_messages(group_id, reverse=True):
if msg.message:
sender = msg.sender
name = f"{sender.first_name or ''} {sender.last_name or ''}".strip() if sender else "Unknown"
topic_name = ''
if msg.reply_to and msg.reply_to.forum_topic: #returns topic name only if msg is a reply to another message
topic_id = msg.reply_to.reply_to_top_id
topic_name = client(functions.channels.GetForumTopicsByIDRequest(channel=channel_id, topics=[topic_id])).topics[0].title
text = msg.message.replace('\n', ' ') if msg.message else ''

f.write(f"[{topic_name}] {name}: {text}\n")


Telethon 1.40

Is there a way to get the topic ID from a Message object, even if the message is not a reply?

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