Telegram Auto Replier

script.py

import time
from telethon import sync, TelegramClient, events

# sample API_ID from https://github.com/telegramdesktop/tdesktop/blob/f98fdeab3fb2ba6f55daf8481595f879729d1b84/Telegram/SourceFiles/config.h#L220
# or use your own
api_id = 
api_hash = ''

# fill in your own details here
phone = '+yourphone'
username = 'YOUR_USER_NAME'
password = 'YOUR_PASSWORD'  # if you have two-step verification enabled

# content of the automatic reply
message = "sorry i'm unavailable"


def main():
    # Create the client and connect
    client = TelegramClient(username, api_id, api_hash)
    client.start(phone)

    @client.on(events.NewMessage)
    def _(event):
        if event.is_private:
            event.reply(message)

    print(time.asctime(), '-', 'Auto-replying...')
    client.run_until_disconnected()
    client.disconnect()
    print(time.asctime(), '-', 'Stopped!')


if __name__ == '__main__':
    main()