from django.core.management.base import BaseCommand, CommandError
from django.contrib.auth.models import User

class Command(BaseCommand):

    def handle(self, *args, **options):

        # The magic line
        User.objects.create_user(username= 'rmx',
                                email='superuser@super.com',
                                password='rmx55',
                                is_staff=True,
                                is_active=True,
                                is_superuser=True
        )

user@host> manage.py shell
>>> from django.contrib.auth.models import User
>>> user=User.objects.create_user('foo', password='bar')
>>> user.is_superuser=True
>>> user.is_staff=True
>>> user.save()