Absolutely, this is totally achievable! The key is to listen for the event where your bot is added to a chat (group, channel, or private chat) and extract the chat_id from that event to send your instruction message.

Using python-telegram-bot (v20+) #

If you're using the latest version of the popular python-telegram-bot library, you'll want to handle the my_chat_member update. This update triggers whenever the bot's own membership status in a chat changes—like when it's invited.

Here's a minimal working example:

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

async def start(update: Update, context: ContextTypes.DEFAULT_TYPE):
    await update.message.reply_text("Hello! Here are some instructions...")

async def handle_bot_invited(update: Update, context: ContextTypes.DEFAULT_TYPE):
    # Extract the chat ID from the invitation event
    chat_id = update.my_chat_member.chat.id
    # Only trigger if the bot was just added to the chat
    new_status = update.my_chat_member.new_chat_member.status
    if new_status in ["member", "administrator"]:
        # Send your instruction message
        await context.bot.send_message(chat_id=chat_id, text="type /start for instructions")

if __name__ == "__main__":
    # Replace with your actual bot token
    application = ApplicationBuilder().token("YOUR_BOT_TOKEN").build()
    
    # Register handlers
    application.add_handler(CommandHandler("start", start))
    application.add_handler(ChatMemberHandler(handle_bot_invited, ChatMemberHandler.MY_CHAT_MEMBER))
    
    # Start the bot
    application.run_polling()

Key Details: #

• Getting chat_id: The update.my_chat_member.chat.id field directly gives you the ID of the chat where the bot was invited—exactly what you need for send_message.
• Status Check: We verify the bot's new status is "member" or "administrator" to avoid triggering on other status changes (like being removed from a chat).
• Permissions: Ensure your bot has the send_messages permission in the chat (most groups/channels grant this by default when inviting, but double-check if you run into issues).

For Older Versions (v13.x) #

If you're using an older version of python-telegram-bot, the approach is similar but uses a MessageHandler to detect new chat members:

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

def start(update, context):
    update.message.reply_text("Hello! Here are some instructions...")

def handle_bot_invited(update, context):
    # Check if the bot is among the newly added members
    new_members = update.message.new_chat_members
    for member in new_members:
        if member.id == context.bot.id:
            chat_id = update.message.chat.id
            context.bot.send_message(chat_id=chat_id, text="type /start for instructions")

if __name__ == "__main__":
    updater = Updater("YOUR_BOT_TOKEN")
    dp = updater.dispatcher
    
    dp.add_handler(CommandHandler("start", start))
    dp.add_handler(MessageHandler(Filters.status_update.new_chat_members, handle_bot_invited))
    
    updater.start_polling()
    updater.idle()

Either implementation will make your bot automatically send the instruction message as soon as it's invited to any chat.

内容的提问来源于stack exchange，提问作者jimmystackoverflowjiim