bot.py

import logging
from telegram import Update
from telegram.ext import Updater, CommandHandler, MessageHandler, Filters, CallbackContext
import os
from dotenv import load_dotenv

# Load environment variables from .env file
load_dotenv()

# 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
def start(update: Update, context: CallbackContext) -> None:
    """Send a message when the command /start is issued."""
    update.message.reply_text('Hi!')

def help_command(update: Update, context: CallbackContext) -> None:
    """Send a message when the command /help is issued."""
    update.message.reply_text('Help!')

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

def main() -> None:
    """Start the bot."""
    # Get the bot token from the environment variable
    token = os.getenv("TELEGRAM_BOT_TOKEN")

    # Create the Updater and pass it your bot's token.
    updater = Updater(token)

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

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

    # on non-command i.e message - echo the message on Telegram
    dispatcher.add_handler(MessageHandler(Filters.text & ~Filters.command, echo))

    # 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()