How to invite users to a private channel via telethon?

Question

Python

Here is a piece of code in the documentation

from telethon.sync import TelegramClient
from telethon import functions, types

with TelegramClient(name, api_id, api_hash) as client:
    result = client(functions.channels.InviteToChannelRequest(
        channel='username',
        users=['username']
    ))
    print(result.stringify())

But I don't understand what value to insert there (I'm new to working with telethon)