Set an existing user to superuser using Django shell

command

python manage.py shell

set_superuser.py

from django.contrib.auth.models import User
user = User.objects.get(username="myname")
user.is_staff = True
user.is_admin = True
user.save()

In one line:

User.objects.filter(pk=1001).update(is_superuser=True, is_staff=True)

I got this error:
AttributeError: Manager isn't available; 'auth.User' has been swapped for 'users.User'

Worked when did this:

from django.contrib.auth import get_user_model
User = get_user_model()
user = User.objects.get(username="myname")
user.is_staff = True
user.is_admin = True
user.is_superuser = True
user.save()