aiohttp-security/demo/dictionary_auth/users.py

from collections import namedtuple

User = namedtuple('User', ['username', 'password', 'permissions'])

user_map = {
    user.username: user for user in [
        User('devin', 'password', ('public',)),
        User('jack', 'password', ('public', 'protected',)),
    ]
}