how to make a telegram bot code example

Example 1: telegram chat bot using flask

import re
from flask import Flask, request
import telegram
from telebot.credentials import bot_token, bot_user_name,URL


global bot
global TOKEN
TOKEN = bot_token
bot = telegram.Bot(token=TOKEN)

app = Flask(__name__)

@app.route('/{}'.format(TOKEN), methods=['POST'])
def respond():
   # retrieve the message in JSON and then transform it to Telegram object
   update = telegram.Update.de_json(request.get_json(force=True), bot)

   chat_id = update.message.chat.id
   msg_id = update.message.message_id

   # Telegram understands UTF-8, so encode text for unicode compatibility
   text = update.message.text.encode('utf-8').decode()
   # for debugging purposes only
   print("got text message :", text)
   # the first time you chat with the bot AKA the welcoming message
   if text == "/start":
       # print the welcoming message
       bot_welcome = """
       Welcome to coolAvatar bot, the bot is using the service from http://avatars.adorable.io/ to generate cool looking avatars based on the name you enter so please enter a name and the bot will reply with an avatar for your name.
       """
       # send the welcoming message
       bot.sendMessage(chat_id=chat_id, text=bot_welcome, reply_to_message_id=msg_id)


   else:
       try:
           # clear the message we got from any non alphabets
           text = re.sub(r"\W", "_", text)
           # create the api link for the avatar based on http://avatars.adorable.io/
           url = "https://api.adorable.io/avatars/285/{}.png".format(text.strip())
           # reply with a photo to the name the user sent,
           # note that you can send photos by url and telegram will fetch it for you
           bot.sendPhoto(chat_id=chat_id, photo=url, reply_to_message_id=msg_id)
       except Exception:
           # if things went wrong
           bot.sendMessage(chat_id=chat_id, text="There was a problem in the name you used, please enter different name", reply_to_message_id=msg_id)

   return 'ok'

@app.route('/set_webhook', methods=['GET', 'POST'])
def set_webhook():
   s = bot.setWebhook('{URL}{HOOK}'.format(URL=URL, HOOK=TOKEN))
   if s:
       return "webhook setup ok"
   else:
       return "webhook setup failed"

@app.route('/')
def index():
   return '.'


if __name__ == '__main__':
   app.run(threaded=True)

Example 2: telegram bot code

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# 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.
"""

import logging

from telegram.ext import Updater, CommandHandler, MessageHandler, Filters

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

logger = logging.getLogger(__name__)


# Define a few command handlers. These usually take the two arguments update and
# context. Error handlers also receive the raised TelegramError object in error.
def start(update, context):
    """Send a message when the command /start is issued."""
    update.message.reply_text('Hi!')


def help(update, context):
    """Send a message when the command /help is issued."""
    update.message.reply_text('Help!')


def echo(update, context):
    """Echo the user message."""
    update.message.reply_text(update.message.text)


def error(update, context):
    """Log Errors caused by Updates."""
    logger.warning('Update "%s" caused error "%s"', update, context.error)


def main():
    """Start the bot."""
    # Create the Updater and pass it your bot's token.
    # Make sure to set use_context=True to use the new context based callbacks
    # Post version 12 this will no longer be necessary
    updater = Updater("TOKEN", use_context=True)

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

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

    # on noncommand i.e message - echo the message on Telegram
    dp.add_handler(MessageHandler(Filters.text, echo))

    # log all errors
    dp.add_error_handler(error)

    # 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()