Django's auth.User model uses a username field to uniquely identify a user. django-simple-authentication uniquely identifies users with an email address instead, removing the username field altogether.

Additionally, django-simple-authentication offers a feature that forces users to change their password the next time they log in. This can be done by setting simple_authentication.User.force_password_change to True. The ForcePasswordChangeMiddleware must be installed for this feature to work properly.

1. Install: pip install django-simple-authentication.
2. Add: simple_authentication to INSTALLED_APPS.
3. Add: AUTH_USER_MODEL = 'simple_authentication'.
4. Add: simple_authentication.middleware.ForcePasswordChanceMiddleware to MIDDLEWARE.
5. Make migrations: python manage.py makemigrations simple_authentication.
6. Apply migrations: python manage.py migrate simple_authentication.

django_simple_authentication has been tested on Django versions >= 2.0. It may work without issue on earlier versions of Django (or Python), but this is not officially supported.