bugtest.py

from telegram.ext import Updater, CallbackQueryHandler, CallbackContext
from telegram import Update, InlineKeyboardButton, InlineKeyboardMarkup

import random
import logging

logging.basicConfig(format='%(asctime)s - %(name)s - %(levelname)s - %(message)s', level=logging.DEBUG)

bot_token = %YOUR_BOT_TOKEN_HERE%
test_channel_id = %YOUR_TEST_CHANNEL_ID_HERE%


def get_test_keyboard():
    return InlineKeyboardMarkup(
        [
            [InlineKeyboardButton(random.randint(1, 1000000000), callback_data='pressed')]
        ])


def handle(update: Update, context: CallbackContext):
    update.callback_query.answer()
    update.callback_query.edit_message_reply_markup(get_test_keyboard())


updater = Updater(bot_token, use_context=True)
updater.dispatcher.add_handler(CallbackQueryHandler(handle, pattern='pressed'))
updater.start_polling()
updater.bot.send_message(test_channel_id, 'YourTestMessage', reply_markup=get_test_keyboard())