How to create a bot on Python with telegram-bot-api

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How to Create a Telegram Bot with Python and telegram-bot-api: A Complete Guide

Introduction to Telegram Bots

In today's world, messengers have become an integral part of life, and bots are a convenient tool for automating tasks, communicating with users, and even conducting business. If you want to quickly and easily create your own bot for Telegram, Python and the python-telegram-bot library are the perfect choice.

Step 1: Obtaining an Access Token from BotFather

Before writing any code, you need to register your bot with Telegram. To do this:

1. Open Telegram and find the user @BotFather.
2. Enter the command /start and then /newbot.
3. Specify a name and a unique username for your bot (e.g., MyFirstPythonBot).
4. After registration, BotFather will provide you with an API token. Copy it – you'll need it in the code.

Step 2: Installing the Necessary Libraries

To interact with the Telegram API, we will use the python-telegram-bot library. Install it via pip:

pip install python-telegram-bot --upgrade

Step 3: Basic Bot Skeleton

Now, let's create a simple bot that responds to the /start command:

from telegram import Update
from telegram.ext import ApplicationBuilder, CommandHandler, ContextTypes

async def start(update: Update, context: ContextTypes.DEFAULT_TYPE):
    await update.message.reply_text("Hello! I'm your first Python bot!")

if __name__ == '__main__':
    app = ApplicationBuilder().token("YOUR_TOKEN_HERE").build()
    app.add_handler(CommandHandler("start", start))
    app.run_polling()

Explanation:

• ApplicationBuilder and CommandHandler are basic tools for handling commands.
• The start function responds to the /start command and sends a text message to the user.
• The run_polling() method starts the bot and begins checking for new messages.

Step 4: Handling User Messages

Let's add handling of regular text messages:

from telegram.ext import MessageHandler, filters

async def echo(update: Update, context: ContextTypes.DEFAULT_TYPE):
    received_text = update.message.text
    await update.message.reply_text(f"You wrote: {received_text}")

if __name__ == '__main__':
    app = ApplicationBuilder().token("YOUR_TOKEN_HERE").build()
    app.add_handler(CommandHandler("start", start))
    app.add_handler(MessageHandler(filters.TEXT & ~filters.COMMAND, echo))
    app.run_polling()

Now the bot will respond to any text message by repeating your text.

Step 5: Adding Buttons and Interactive Menus

Bots become much more user-friendly when you add buttons:

from telegram import InlineKeyboardButton, InlineKeyboardMarkup

async def menu(update: Update, context: ContextTypes.DEFAULT_TYPE):
    keyboard = [
        [InlineKeyboardButton("Button 1", callback_data='button1')],
        [InlineKeyboardButton("Button 2", callback_data='button2')]
    ]
    reply_markup = InlineKeyboardMarkup(keyboard)
    await update.message.reply_text('Choose an option:', reply_markup=reply_markup)

async def button_handler(update: Update, context: ContextTypes.DEFAULT_TYPE):
    query = update.callback_query
    await query.answer()
    await query.edit_message_text(text=f"You pressed: {query.data}")

if __name__ == '__main__':
    from telegram.ext import CallbackQueryHandler
    app = ApplicationBuilder().token("YOUR_TOKEN_HERE").build()
    app.add_handler(CommandHandler("start", start))
    app.add_handler(CommandHandler("menu", menu))
    app.add_handler(CallbackQueryHandler(button_handler))
    app.add_handler(MessageHandler(filters.TEXT & ~filters.COMMAND, echo))
    app.run_polling()

Now, if you send the /menu command, the bot will display buttons, and when pressed, it will send the corresponding message.

Step 6: Handling Errors in the Bot

A good practice is to add error handling so that the bot doesn't crash when exceptions occur:

async def error_handler(update: object, context: ContextTypes.DEFAULT_TYPE):
    print(f"An error occurred: {context.error}")

app.add_error_handler(error_handler)

Step 7: Deploying the Bot on a Server

If you want the bot to work around the clock, it needs to be deployed on a server. Here are a few hosting options:

• Free solutions: Heroku, PythonAnywhere (for simple bots).
• Paid solutions: AWS, DigitalOcean, VPS services.

You can also configure the bot to run as a service on the server using systemd or use Docker.

Frequently Asked Questions (FAQ)

• Can I use the bot in a group? Yes! Add it to the group and configure the appropriate permissions.
• What is the difference between polling and webhook?
  • Polling: The bot itself polls the Telegram server.
  • Webhook: The Telegram server sends data directly to your server (better for production).
• How do I send photos and files through the bot?

await update.message.reply_photo(photo="https://example.com/image.jpg")

• Where can I store the token securely? Use environment variables or .env files. Never commit the token to a repository!
• Can I send out mass mailings through the bot? Yes, just store user IDs and send them messages in a loop.

Conclusion

Creating a Telegram bot with Python is a fun and useful experience. With the python-telegram-bot library, you can quickly develop interactive bots, integrate them with various services, and automate routine tasks. I hope this guide helps you create your first successful bot!