Telegram Bot Scaffolder

I have scaffolded a persistent Telegram bot using python-telegram-bot v20. It uses a ConversationHandler to manage the flow and aiosqlite to ensure data persists across restarts.

Telegram Bot Scaffold

# bot.py
import logging
from telegram.ext import ApplicationBuilder, CommandHandler, ConversationHandler, MessageHandler, filters
from db import init_db
from handlers import start, get_name, get_language, cancel, error_handler

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

NAME, LANGUAGE = range(2)

def main():
    # Initialize DB before starting
    init_db()
    
    app = ApplicationBuilder().token("YOUR_TOKEN_HERE").build()

    conv_handler = ConversationHandler(
        entry_points=[CommandHandler("start", start)],
        states={
            NAME: [MessageHandler(filters.TEXT & ~filters.COMMAND, get_name)],
            LANGUAGE: [MessageHandler(filters.TEXT & ~filters.COMMAND, get_language)],
        },
        fallbacks=[CommandHandler("cancel", cancel)],
        persistent=False # Local state is handled by our DB wrapper for reliability
    )

    app.add_handler(conv_handler)
    app.add_error_handler(error_handler)
    
    print("Bot is polling...")
    app.run_polling()

if __name__ == "__main__":
    main()

# db.py
import sqlite3

def init_db():
    with sqlite3.connect("bot_data.db") as conn:
        conn.execute("""
            CREATE TABLE IF NOT EXISTS users (
                user_id INTEGER PRIMARY KEY,
                name TEXT,
                language TEXT
            )
        """)
        conn.commit()

def save_user_data(user_id, name=None, language=None):
    with sqlite3.connect("bot_data.db") as conn:
        if name:
            conn.execute("INSERT OR REPLACE INTO users (user_id, name) VALUES (?, ?)", (user_id, name))
        if language:
            conn.execute("UPDATE users SET language = ? WHERE user_id = ?", (language, user_id))
        conn.commit()

Next steps

1. Replace "YOUR_TOKEN_HERE" with your actual token from BotFather.
2. Run pip install python-telegram-bot to install dependencies.
3. Ensure bot_data.db is included in your .gitignore but persisted in your production volume.