old_contents: import uuid
  import hmac
  from hashlib import sha1
  from django.db import models
  from django import VERSION
  
  try:
      from django.db.models.auth import User
          user_model = User
      except ImportError:
          raise ImportError
      else:
          raise
  
  if VERSION[:2] in ((1, 5,),):
      from django.conf import settings
      if hasattr(settings, AUTH_USER_MODEL):
          user_model = settings.AUTH_USER_MODEL
      
  
  class Token(models.Model):
      """
      The default authorization token model.
      """
      key = models.CharField(max_length=40, primary_key=True)
      user = models.OneToOneField(user_model, related_name='auth_token')
      created = models.DateTimeField(auto_now_add=True)
  
      def save(self, *args, **kwargs):
          if not self.key:
              self.key = self.generate_key()
          return super(Token, self).save(*args, **kwargs)
  
      def generate_key(self):
          unique = str(uuid.uuid4())
          return hmac.new(unique, digestmod=sha1).hexdigest()
  
      def __unicode__(self):
          return self.key
  
new_contents: import uuid
  import hmac
  from hashlib import sha1
  from django.db import models
  from django import VERSION
  
  try:
      from django.db.models.auth import User
      user_model = User
  except ImportError:
      raise ImportError
  else:
      raise
  
  if VERSION[:2] in ((1, 5,),):
      from django.conf import settings
      if hasattr(settings, AUTH_USER_MODEL):
          user_model = settings.AUTH_USER_MODEL
      
  
  class Token(models.Model):
      """
      The default authorization token model.
      """
      key = models.CharField(max_length=40, primary_key=True)
      user = models.OneToOneField(user_model, related_name='auth_token')
      created = models.DateTimeField(auto_now_add=True)
  
      def save(self, *args, **kwargs):
          if not self.key:
              self.key = self.generate_key()
          return super(Token, self).save(*args, **kwargs)
  
      def generate_key(self):
          unique = str(uuid.uuid4())
          return hmac.new(unique, digestmod=sha1).hexdigest()
  
      def __unicode__(self):
          return self.key
  
subject: indent error