web.py

import asyncio, os
import hypercorn.asyncio
from flask import Flask
from asgiref.wsgi import WsgiToAsgi
from hypercorn.config import Config

from telethon import TelegramClient, events
from telethon.sessions import StringSession



app = Flask(__name__)
aapp = WsgiToAsgi(app)


#heroku support##
#Procfile ~> web: python3 web.py --workers 1 
port = int(os.environ.get("PORT", 5000))
config = Config()
config.bind = [f"0.0.0.0:{port}"] 
###*###


client = TelegramClient("...")


@app.route('/')
async def hello_world():
   return 'Hello World'

@client.on(events.NewMessage(pattern='/start'))
async def start(event):
    return await event.respond('hello World!')


async def start():
  await client.start()
  await hypercorn.asyncio.serve(aapp, config)
  await client.run_until_disconnected()

   

if __name__ == "__main__":
  client.loop.run_until_complete(start())