old_contents: import datetime
  import hmac
  import time
  from django.conf import settings
  from django.db import models
  from tastypie.utils import now
  
  try:
      from hashlib import sha1
  except ImportError:
      import sha
      sha1 = sha.sha
  
  
  class ApiAccess(models.Model):
      """A simple model for use with the ``CacheDBThrottle`` behaviors."""
      identifier = models.CharField(max_length=255)
      url = models.CharField(max_length=255, blank=True, default='')
      request_method = models.CharField(max_length=10, blank=True, default='')
      accessed = models.PositiveIntegerField()
      
      def __unicode__(self):
          return u"%s @ %s" % (self.identifier, self.accessed)
      
      def save(self, *args, **kwargs):
          self.accessed = int(time.time())
          return super(ApiAccess, self).save(*args, **kwargs)
  
  
  if 'django.contrib.auth' in settings.INSTALLED_APPS:
      import uuid
      from django.conf import settings
      from django.contrib.auth.models import User
      
      class ApiKey(models.Model):
          user = models.OneToOneField(User, related_name='api_key')
          key = models.CharField(max_length=256, blank=True, default='', db_index=True)
          created = models.DateTimeField(default=now)
  
          def __unicode__(self):
              return u"%s for %s" % (self.key, self.user)
          
          def save(self, *args, **kwargs):
              if not self.key:
                  self.key = self.generate_key()
              
              return super(ApiKey, self).save(*args, **kwargs)
          
          def generate_key(self):
              # Get a random UUID.
              new_uuid = uuid.uuid4()
              # Hmac that beast.
              return hmac.new(str(new_uuid), digestmod=sha1).hexdigest()
      
      
      def create_api_key(sender, **kwargs):
          """
          A signal for hooking up automatic ``ApiKey`` creation.
          """
          if kwargs.get('created') is True:
              ApiKey.objects.create(user=kwargs.get('instance'))
  
new_contents: import hmac
  import time
  from django.conf import settings
  from django.db import models
  from tastypie.utils import now
  
  try:
      from hashlib import sha1
  except ImportError:
      import sha
      sha1 = sha.sha
  
  
  class ApiAccess(models.Model):
      """A simple model for use with the ``CacheDBThrottle`` behaviors."""
      identifier = models.CharField(max_length=255)
      url = models.CharField(max_length=255, blank=True, default='')
      request_method = models.CharField(max_length=10, blank=True, default='')
      accessed = models.PositiveIntegerField()
      
      def __unicode__(self):
          return u"%s @ %s" % (self.identifier, self.accessed)
      
      def save(self, *args, **kwargs):
          self.accessed = int(time.time())
          return super(ApiAccess, self).save(*args, **kwargs)
  
  
  if 'django.contrib.auth' in settings.INSTALLED_APPS:
      import uuid
      from django.contrib.auth.models import User
      
      class ApiKey(models.Model):
          user = models.OneToOneField(User, related_name='api_key')
          key = models.CharField(max_length=256, blank=True, default='', db_index=True)
          created = models.DateTimeField(default=now)
  
          def __unicode__(self):
              return u"%s for %s" % (self.key, self.user)
          
          def save(self, *args, **kwargs):
              if not self.key:
                  self.key = self.generate_key()
              
              return super(ApiKey, self).save(*args, **kwargs)
          
          def generate_key(self):
              # Get a random UUID.
              new_uuid = uuid.uuid4()
              # Hmac that beast.
              return hmac.new(str(new_uuid), digestmod=sha1).hexdigest()
      
      
      def create_api_key(sender, **kwargs):
          """
          A signal for hooking up automatic ``ApiKey`` creation.
          """
          if kwargs.get('created') is True:
              ApiKey.objects.create(user=kwargs.get('instance'))
  
subject: Remove unused imports in models.py