diff --git a/chamber/commands/__init__.py b/chamber/commands/__init__.py
index 3a69c10..43b1f1a 100644
--- a/chamber/commands/__init__.py
+++ b/chamber/commands/__init__.py
@@ -52,7 +52,7 @@ def _post_import_rows(self, created_count, updated_count=0):
 
 class ImportCSVCommand(ImportCSVCommandMixin, CSVImporter, BaseCommand):
 
-    def _post_import_rows(self, created_count, updated_count):
+    def _post_import_rows(self, created_count, updated_count=0):
         self.stdout.write('Created {created} {model_name} and {updated} updated.'.format(
             created=created_count,
             model_name=self.model_class._meta.verbose_name_plural,
diff --git a/chamber/migrations/fixtures_south.py b/chamber/migrations/fixtures_south.py
index b825a0b..d55845d 100644
--- a/chamber/migrations/fixtures_south.py
+++ b/chamber/migrations/fixtures_south.py
@@ -15,7 +15,7 @@ def load_fixture(file_name, orm):
     def get_model_southern_style(*args):
         try:
             return orm['.'.join(args)]
-        except:
+        except KeyError:
             return original_get_model(*args)
 
     models.get_model = get_model_southern_style
@@ -34,4 +34,4 @@ def load_fixture_of_migration(migration, orm, fixture_type='json'):
     file = os.path.join(fixture_dir, fixture_filename)
     if not os.path.isfile(file):
         raise IOError('File "%s" does not exists' % file)
-    load_fixture(file, orm)
\ No newline at end of file
+    load_fixture(file, orm)
diff --git a/example/dj/apps/test_chamber/tests/models/fields.py b/example/dj/apps/test_chamber/tests/models/fields.py
index 5e2c947..297cb83 100644
--- a/example/dj/apps/test_chamber/tests/models/fields.py
+++ b/example/dj/apps/test_chamber/tests/models/fields.py
@@ -1,9 +1,8 @@
-from django.core.exceptions import ValidationError
 from django.test import TransactionTestCase
 
 from chamber.shortcuts import change_and_save
 from chamber.models.fields import generate_random_upload_path
-from germanium.tools import assert_equal, assert_raises, assert_true, assert_false, assert_is_none
+from germanium.tools import assert_equal, assert_raises, assert_true, assert_is_none
 
 from chamber.exceptions import PersistenceException
 
@@ -14,7 +13,7 @@ class ModelFieldsTestCase(TransactionTestCase):
 
     def setUp(self):
         self.inst = TestFieldsModel()
-        super(TransactionTestCase, self).setUp()
+        super(ModelFieldsTestCase, self).setUp()
 
     def test_random_file_path_should_be_generated_from_class_name(self):
         instance = CSVRecord()
diff --git a/example/dj/apps/test_chamber/tests/utils/datastructures.py b/example/dj/apps/test_chamber/tests/utils/datastructures.py
index a6719ea..4fbdc10 100644
--- a/example/dj/apps/test_chamber/tests/utils/datastructures.py
+++ b/example/dj/apps/test_chamber/tests/utils/datastructures.py
@@ -2,9 +2,9 @@
 
 from django.test import TestCase
 
-from germanium.tools import assert_equal, assert_raises
+from chamber.utils.datastructures import (ChoicesEnum, ChoicesNumEnum, Enum, NumEnum, OrderedSet)
 
-from chamber.utils.datastructures import Enum, NumEnum, ChoicesEnum, ChoicesNumEnum, OrderedSet
+from germanium.tools import assert_equal, assert_raises
 
 
 class DatastructuresTestCase(TestCase):