bot-price/bot_buy.py

import os
api_id = os.environ['TELEGRAM_API']

import telegram
import time
from telegram.error import NetworkError, Unauthorized
from telegram.ext import Updater, CommandHandler, MessageHandler, Filters

def start(update, context):
        update.message.reply_text(context['chat']['id'])

def help(update, context):
        update.message.reply_text('Help!')
def error(update, context):
        """Log Errors caused by Updates."""
        print(f'Update {update} caused error {context.error}')


class Messenger:

    def __init__(self):
        self.bot = telegram.Bot(api_id)
        
    def sendMessage(self, messageText):
        self.bot.send_message(chat_id="839816588", text=messageText)

    def listener(self):
        self.updater = Updater(api_id, use_context=True)
        self.dp = self.updater.dispatcher
        self.dp.add_handler(CommandHandler("start", start))
        self.dp.add_handler(CommandHandler("help", help))
        self.dp.add_error_handler(error)
        self.updater.start_polling()
        self.updater.idle()