diff --git a/categories/__init__.py b/categories/__init__.py
index 1f2992c..01a1451 100644
--- a/categories/__init__.py
+++ b/categories/__init__.py
@@ -16,6 +16,7 @@ def get_version(short=False):
         vers.append('%s%i' % (__version_info__['releaselevel'][0], __version_info__['serial']))
     return ''.join(vers)
 
+
 __version__ = get_version()
 
 
@@ -27,6 +28,8 @@ def register():
     from categories.registration import (_process_registry, registry)
     _process_registry(settings.FK_REGISTRY, registry.register_fk)
     _process_registry(settings.M2M_REGISTRY, registry.register_m2m)
+
+
 try:
     register()
 except Exception as e:
diff --git a/categories/admin.py b/categories/admin.py
index 1789150..5c0eaba 100644
--- a/categories/admin.py
+++ b/categories/admin.py
@@ -22,6 +22,7 @@ class NullTreeNodeChoiceField(forms.ModelChoiceField):
         """
         return '%s %s' % (self.level_indicator * getattr(obj, obj._mptt_meta.level_attr), obj)
 
+
 if RELATION_MODELS:
     from .models import CategoryRelation
 
@@ -65,6 +66,7 @@ class CategoryAdmin(CategoryBaseAdmin):
     class Media:
         js = (JAVASCRIPT_URL + 'genericcollections.js',)
 
+
 if REGISTER_ADMIN:
     admin.site.register(Category, CategoryAdmin)
 
diff --git a/categories/editor/templatetags/admin_tree_list_tags.py b/categories/editor/templatetags/admin_tree_list_tags.py
index b4a6482..c3bba24 100644
--- a/categories/editor/templatetags/admin_tree_list_tags.py
+++ b/categories/editor/templatetags/admin_tree_list_tags.py
@@ -173,4 +173,6 @@ def result_tree_list(cl):
         from django.contrib.admin.templatetags.admin_list import result_hidden_fields
         result['result_hidden_fields'] = list(result_hidden_fields(cl))
     return result
+
+
 result_tree_list = register.inclusion_tag(TREE_LIST_RESULTS_TEMPLATE)(result_tree_list)
diff --git a/categories/fields.py b/categories/fields.py
index 4278ef7..c7418b5 100644
--- a/categories/fields.py
+++ b/categories/fields.py
@@ -16,6 +16,7 @@ class CategoryFKField(ForeignKey):
             kwargs.pop('to')
         super(CategoryFKField, self).__init__(to=Category, **kwargs)
 
+
 try:
     from south.modelsinspector import add_introspection_rules
     add_introspection_rules([], ["^categories\.fields\.CategoryFKField"])
diff --git a/categories/models.py b/categories/models.py
index a10675c..3c16ca2 100644
--- a/categories/models.py
+++ b/categories/models.py
@@ -144,6 +144,7 @@ class CategoryRelation(models.Model):
     def __unicode__(self):
         return "CategoryRelation"
 
+
 try:
     from south.db import db  # noqa, South is required for migrating. Need to check for it
     from django.db.models.signals import post_syncdb
diff --git a/categories/registration.py b/categories/registration.py
index 5eb8105..04cbb13 100644
--- a/categories/registration.py
+++ b/categories/registration.py
@@ -110,6 +110,7 @@ class Registry(object):
             self._field_registry[registry_name] = field(**extra_params)
             self._field_registry[registry_name].contribute_to_class(model, field_name)
 
+
 registry = Registry()
 
 
diff --git a/categories/templatetags/category_tags.py b/categories/templatetags/category_tags.py
index 1db869f..83bc42d 100644
--- a/categories/templatetags/category_tags.py
+++ b/categories/templatetags/category_tags.py
@@ -338,6 +338,7 @@ def do_get_latest_objects_by_category(parser, token):
         num = FilterExpression(None, parser)
     return LatestObjectsNode(var_name, category, app_label, model_name, set_name, date_field, num)
 
+
 register.tag("get_latest_objects_by_category", do_get_latest_objects_by_category)
 
 
diff --git a/doc_src/code_examples/custom_categories2.py b/doc_src/code_examples/custom_categories2.py
index 53cf264..9e63168 100644
--- a/doc_src/code_examples/custom_categories2.py
+++ b/doc_src/code_examples/custom_categories2.py
@@ -8,4 +8,5 @@ from .models import SimpleCategory
 class SimpleCategoryAdmin(CategoryBaseAdmin):
     pass
 
+
 admin.site.register(SimpleCategory, SimpleCategoryAdmin)
diff --git a/example/simpletext/admin.py b/example/simpletext/admin.py
index 573370d..dcf1947 100644
--- a/example/simpletext/admin.py
+++ b/example/simpletext/admin.py
@@ -21,5 +21,6 @@ class SimpleCategoryAdminForm(CategoryBaseAdminForm):
 class SimpleCategoryAdmin(CategoryBaseAdmin):
     form = SimpleCategoryAdminForm
 
+
 admin.site.register(SimpleText, SimpleTextAdmin)
 admin.site.register(SimpleCategory, SimpleCategoryAdmin)
diff --git a/example/simpletext/tests.py b/example/simpletext/tests.py
index f54e74f..73d6465 100755
--- a/example/simpletext/tests.py
+++ b/example/simpletext/tests.py
@@ -15,6 +15,7 @@ class SimpleTest(TestCase):
         """
         self.assertEqual(1 + 1, 2)
 
+
 __test__ = {"doctest": """
 Another way to test that 1 + 1 is equal to 2.