Telegram Bot - Main Function

main.py

def main():
    '''Start Bot'''
    # Launch Updater
    updater = Updater("{}".format(TOKEN), use_context=True)
    # Get the dispatcher to register handlers
    dispatcher = updater.dispatcher

    # conversions handled by command
    dispatcher.add_handler(CommandHandler("start", start))

    # conversation handler
    loc_handler = ConversationHandler(
        entry_points = [CommandHandler('start_tracking', start_tracking)],
        states = {
            LOC: [
                MessageHandler(Filters.location, location)],
            PHOTO: [
                MessageHandler(Filters.photo, photo)],
            DN:[MessageHandler(Filters.text & ~Filters.command, delivery_number)]
        },
        fallbacks = [CommandHandler('cancel', cancel)]
    )
    dispatcher.add_handler(loc_handler)

    # log all errors
    dispatcher.add_error_handler(error)
    # Start the Bot
    updater.start_webhook(listen="0.0.0.0",
                          port=PORT,
                          url_path="{}".format(TOKEN))
    # updater.bot.set_webhook(url=settings.WEBHOOK_URL)
    updater.bot.set_webhook("{}".format(APP_NAME) + "{}".format(TOKEN))
    # start_polling() is non-blocking and will stop the bot gracefully.
    updater.start_polling()
    updater.idle()