diff --git a/model_utils/fields.py b/model_utils/fields.py
index e949c23..a2f4d3e 100644
--- a/model_utils/fields.py
+++ b/model_utils/fields.py
@@ -3,7 +3,7 @@ from datetime import datetime
 from django.db import models
 from django.conf import settings
 
-class AutoCreatedField (models.DateTimeField):
+class AutoCreatedField(models.DateTimeField):
     """
     A DateTimeField that automatically populates itself at
     object creation.
@@ -11,22 +11,22 @@ class AutoCreatedField (models.DateTimeField):
     By default, sets editable=False, default=datetime.now.
 
     """
-    def __init__ (self, *args, **kwargs):
+    def __init__(self, *args, **kwargs):
         kwargs.setdefault('editable', False)
         kwargs.setdefault('default', datetime.now)
         super(AutoCreatedField, self).__init__(*args, **kwargs)
 
-class AutoLastModifiedField (AutoCreatedField):
+class AutoLastModifiedField(AutoCreatedField):
     """
     A DateTimeField that updates itself on each save() of the model.
 
     By default, sets editable=False and default=datetime.now.
     
     """
-    def pre_save (self, model_instance, add):
+    def pre_save(self, model_instance, add):
         value = datetime.now()
         setattr(model_instance, self.attname, value)
-        return value    
+        return value
 
 SPLIT_MARKER = getattr(settings, 'SPLIT_MARKER', '<!-- split -->')
 
diff --git a/model_utils/models.py b/model_utils/models.py
index 0939a1f..01041dc 100644
--- a/model_utils/models.py
+++ b/model_utils/models.py
@@ -12,23 +12,23 @@ class InheritanceCastModel(models.Model):
 
     """
     real_type = models.ForeignKey(ContentType, editable=False, null=True)
-    
+
     def save(self, *args, **kwargs):
         if not self.id:
             self.real_type = self._get_real_type()
         super(InheritanceCastModel, self).save(*args, **kwargs)
-        
+
     def _get_real_type(self):
         return ContentType.objects.get_for_model(type(self))
-                
+
     def cast(self):
         return self.real_type.get_object_for_this_type(pk=self.pk)
-        
+
     class Meta:
         abstract = True
 
 
-class TimeStampedModel (models.Model):
+class TimeStampedModel(models.Model):
     """
     An abstract base class model that provides self-updating
     ``created`` and ``modified`` fields.