how to get auth in custom user django code example

Example 1: Django Custom user model

...
class User(AbstractUser):
    def __unicode__(self):
        return self.username
    balance = models.IntegerField(default=0)
    total_pledged = models.IntegerField(default=0)
    last_pledged = models.ForeignKey('Transaction', related_name='pledger', blank=True, null=True)
    extension_key = models.CharField(max_length=100, null=True, blank=True)
    plugin_key = models.CharField(max_length=100, null=True, blank=True)
    ghosted = models.BooleanField(default=False)

    def save(self, *args, **kwargs):
        print('saving')
        try:
            self.company.save()
        except:
            print('no company')
        super(User, self).save(*args, **kwargs)
...

Example 2: Django Custom User Model

ChangeSwappableModel(
    setting="AUTH_USER_MODEL",
    old="auth.User",
    new="my_auth.User"
)