aiogram/examples/without_dispatcher.py

import asyncio
from argparse import ArgumentParser

from aiogram import Bot
from aiogram.client.default import DefaultBotProperties
from aiogram.enums import ParseMode


def create_parser() -> ArgumentParser:
    parser = ArgumentParser()
    parser.add_argument("--token", help="Telegram Bot API Token")
    parser.add_argument("--chat-id", type=int, help="Target chat id")
    parser.add_argument("--message", "-m", help="Message text to sent", default="Hello, World!")

    return parser


async def main() -> None:
    parser = create_parser()
    ns = parser.parse_args()

    token = ns.token
    chat_id = ns.chat_id
    message = ns.message

    async with Bot(
        token=token,
        default=DefaultBotProperties(
            parse_mode=ParseMode.HTML,
        ),
    ) as bot:
        await bot.send_message(chat_id=chat_id, text=message)


if __name__ == "__main__":
    asyncio.run(main())