Using telethon with flask: There is no current event loop in thread 'Thread-1'.

[gekich]

I want to use Telethon from the Flask Web App. But when I am running it, I am getting following error:

RuntimeError: There is no current event loop in thread 'Thread-1'.

Code that causes the issue

from flask import Flask
from telethon.sync import TelegramClient


app = Flask(__name__)

@app.route('/')
def index():
    api_id = XXXXXX
    api_hash = 'XXXXXXX'
    bot_token = 'XXXXXXX'
    client = TelegramClient('bot', api_id, api_hash)
    client.start()
    return 'Index Page'

if __name__ == '__main__':
    app.run()

I tried to fix the issue using sync-stale version of Telethon. But there are no type ChatBannedRights i need.
i used commands:
pip3 uninstall telethon
pip3 install --no-cache --upgrade git+https://github.com/LonamiWebs/Telethon@sync-stale
to install the sync-stale version.

And got error ImportError: cannot import name 'ChatBannedRights' from 'telethon.tl.types' (/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/telethon/tl/types/__init__.py) when tried to import type:

from telethon.tl.types import ChatBannedRights

So basically there are two issues:

1. Im getting error "There is no current event loop in thread 'Thread-1'." while using Flask and Telethon
2. There are no type ChatBannedRights in sync-stale version of Telethon.

Hope you can help me

[Lonami]

Nope, sorry, issues aren't for questions. StackOverflow or the group are.

[ftuyama]

Why so rude?
If someone has the same question: https://docs.telethon.dev/en/latest/concepts/asyncio.html?highlight=thread#can-i-use-threads

[Lonami]

You asked the same thing in #1253, there is no need to repeat yourself. Please stop reviving old issues.

[x1cked]

Hey. It works for me

import asyncio

@app.route('/')
def index():
    loop = asyncio.new_event_loop()
    asyncio.set_event_loop(loop)
    client = TelegramClient('mysession', api_id, api_hash, loop=loop)
    client.start()
    return 'Index Page'

[Thambolo]

Hey. It works for me

import asyncio

@app.route('/')
def index():
    loop = asyncio.new_event_loop()
    asyncio.set_event_loop(loop)
    client = TelegramClient('mysession', api_id, api_hash, loop=loop)
    client.start()
    return 'Index Page'

Hey there, does anyone know if you have to add asyncio.set_event_loop(asyncio.new_event_loop()) to the start of every route or just at an initial route?

What if you want to do a client.run_until_disconnected() for events like newmessage, do you add it to every route or ?

Thanks!

[FujiwaraChoki]

I still get the error, even after doing this

Hey. It works for me

import asyncio

@app.route('/')
def index():
    loop = asyncio.new_event_loop()
    asyncio.set_event_loop(loop)
    client = TelegramClient('mysession', api_id, api_hash, loop=loop)
    client.start()
    return 'Index Page'

[bovaqulov]

telethon and flask webhook sync