Sandbox::https://github.com/stack-queue/pyrogram/blob/asyncio-dev/examples/welcomebot.py

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"""This is the Welcome Bot in @PyrogramChat.

It uses the Emoji module to easily add emojis in your text messages and Filters

to make it only work for specific messages in a specific chat.

"""

from pyrogram import Client, Emoji, Filters

TARGET = "PyrogramChat" # Target chat. Can also be a list of multiple chat ids/usernames

MENTION = "[{}](tg://user?id={})" # User mention markup

MESSAGE = "{} Welcome to [Pyrogram](https://docs.pyrogram.org/)'s group chat {}!" # Welcome message

app = Client("my_account")

# Filter in only new_chat_members updates generated in TARGET chat

@app.on_message(Filters.chat(TARGET) & Filters.new_chat_members)

def welcome(client, message):

# Build the new members list (with mentions) by using their first_name

new_members = [MENTION.format(i.first_name, i.id) for i in message.new_chat_members]

# Build the welcome message by using an emoji and the list we built above

text = MESSAGE.format(Emoji.SPARKLES, ", ".join(new_members))

# Send the welcome message, without the web page preview

message.reply(text, disable_web_page_preview=True)

app.run() # Automatically start() and idle()