python manage.py startapp login

AUTHENTICATION_BACKENDS = (
  'login.auth.UsernamePasswordAuth',
)

#coding:utf-8
from django.contrib.auth.models import User
class UsernamePasswordAuth(object):
  def authenticate(self, username=None, password=None):
    print("UsernamePasswordAuth.authenticate")
    try:
      user = User.objects.get(username__iexact=username)
      if user.check_password(password):
        return user
    except User.DoesNotExist:
      return None
  def get_user(self, user_id):
    print("UsernamePasswordAuth.get_user")
    try:
      user = User.objects.get(pk=user_id)
      return user
    except User.DoesNotExist:
      return None