bot_maintainence.py

#!/usr/bin/env python3
# pylint: disable=C0116,W0613
# This program is dedicated to the public domain under the CC0 license.

"""
Simple Bot to reply to Telegram messages.
First, a few handler functions are defined. Then, those functions are passed to
the Dispatcher and registered at their respective places.
Then, the bot is started and runs until we press Ctrl-C on the command line.
Usage:
Basic Echobot example, repeats messages.
Press Ctrl-C on the command line or send a signal to the process to stop the
bot.
"""

from telegram import Update, ForceReply
from telegram.ext import (
    Updater,
    CommandHandler,
    MessageHandler,
    Filters,
    CallbackContext,
)
import sys

MAINTAIN_MSG = """Oops, you caught me in the middle of maintenance mode!

I will be back up again shortly with new features :)
"""


def maintain(update: Update, context: CallbackContext) -> None:
    """Echo the user message."""
    update.message.reply_text(MAINTAIN_MSG)


def main() -> None:
    """Start the bot."""
    # Create the Updater and pass it your bot's token.
    updater = Updater(sys.argv[1])

    # Get the dispatcher to register handlers
    dispatcher = updater.dispatcher

    # on different commands - answer in Telegram
    dispatcher.add_handler(CommandHandler("start", maintain))

    # on non command i.e message - echo the message on Telegram
    dispatcher.add_handler(MessageHandler(Filters.all, maintain))

    # Start the Bot
    updater.start_polling()

    # Run the bot until you press Ctrl-C or the process receives SIGINT,
    # SIGTERM or SIGABRT. This should be used most of the time, since
    # start_polling() is non-blocking and will stop the bot gracefully.
    updater.idle()


if __name__ == "__main__":
    main()