Import and PEP8 cleanups

apps/checkouts/models.py

@@ -3,7 +3,7 @@ from __future__ import absolute_import
 import logging
 import datetime
 
-from django.db import models, IntegrityError
+from django.db import models
 from django.utils.translation import ugettext_lazy as _
 from django.contrib.contenttypes.models import ContentType
 from django.contrib.contenttypes import generic
@@ -11,7 +11,6 @@ from django.contrib.contenttypes import generic
 from documents.models import Document
 
 from .managers import DocumentCheckoutManager
-from .exceptions import DocumentAlreadyCheckedOut
 from .events import history_document_checked_out
 
 logger = logging.getLogger(__name__)
@@ -33,9 +32,9 @@ class DocumentCheckout(models.Model):
     #block_metadata
     #block_editing
     #block tag add/remove
-    
+
     objects = DocumentCheckoutManager()
-    
+
     def __unicode__(self):
         return unicode(self.document)
 
@@ -45,11 +44,11 @@ class DocumentCheckout(models.Model):
         result = super(DocumentCheckout, self).save(*args, **kwargs)
         history_document_checked_out.commit(source_object=self.document, data={'user': self.user_object, 'document': self.document})
         return result
-    
+
     @models.permalink
     def get_absolute_url(self):
-        return ('checkout_info', [self.document.pk])        
-        
+        return ('checkout_info', [self.document.pk])
+
     class Meta:
         verbose_name = _(u'document checkout')
         verbose_name_plural = _(u'document checkouts')