# -*- coding: utf-8 -*-
from django.db import models
from django.contrib.auth.models import User
from django.db.models.signals import post_save

class UserProfile(models.Model):
  user = models.OneToOneField(User)
  nickname = models.CharField(max_length=16, default='', blank=True)
  sex = models.IntegerField(default=0)
  phone = models.CharField(max_length=16, default='', blank=True)

  def __str__(self):
    return self.nickname

  def __unicode__(self):
    return self.nickname

def create_user_profile(sender, instance, created, **kwargs):
  if created:
    profile = UserProfile()
    profile.user = instance
    profile.save()

post_save.connect(create_user_profile, sender=User)

# -*- coding: utf-8 -*-
from django.contrib import admin
from django.contrib.auth.models import User
from django.contrib.auth.admin import UserAdmin
from .models import UserProfile

class ProfileInline(admin.StackedInline):
  model = UserProfile
  max_num = 1
  can_delete = False

class UserProfileAdmin(UserAdmin):
  inlines = [ProfileInline, ]

admin.site.unregister(User)
admin.site.register(User, UserProfileAdmin)

$ python manage.py syncdb
$ python manage.py shell
> from django.contrib.auth.models import User
> user = User()
> user.username='testuser'
> user.save()
> User.objects.all()[0].userprofile