diff --git a/mongoengine/document.py b/mongoengine/document.py
index 38fcc63d..40c2a6cf 100644
--- a/mongoengine/document.py
+++ b/mongoengine/document.py
@@ -8,9 +8,9 @@ import six
 
 from mongoengine import signals
 from mongoengine.base.common import ALLOW_INHERITANCE, get_document
-from mongoengine.base.document import BaseDocument
 from mongoengine.base.datastructures import (BaseDict, BaseList,
                                              EmbeddedDocumentList)
+from mongoengine.base.document import BaseDocument
 from mongoengine.base.metaclasses import (DocumentMetaclass,
                                           TopLevelDocumentMetaclass)
 from mongoengine.common import _import_class
diff --git a/mongoengine/python_support.py b/mongoengine/python_support.py
index 849f48d2..b8dd0603 100644
--- a/mongoengine/python_support.py
+++ b/mongoengine/python_support.py
@@ -25,4 +25,3 @@ if not PY3:
         from cStringIO import StringIO
     except ImportError:
         pass
-
diff --git a/mongoengine/queryset/__init__.py b/mongoengine/queryset/__init__.py
index d4fd4e61..40aa1cc7 100644
--- a/mongoengine/queryset/__init__.py
+++ b/mongoengine/queryset/__init__.py
@@ -2,11 +2,9 @@ from mongoengine.errors import (DoesNotExist, InvalidQueryError,
                                 MultipleObjectsReturned, NotUniqueError,
                                 OperationError)
 from mongoengine.queryset.field_list import QueryFieldList
-from mongoengine.queryset.manager import queryset_manager, QuerySetManager
-from mongoengine.queryset.queryset import (QuerySet, QuerySetNoCache,
-                                           DO_NOTHING, NULLIFY, CASCADE,
-                                           DENY, PULL)
-#from mongoengine.queryset.transform import query, update
+from mongoengine.queryset.manager import QuerySetManager, queryset_manager
+from mongoengine.queryset.queryset import (CASCADE, DENY, DO_NOTHING, NULLIFY,
+                                           PULL, QuerySet, QuerySetNoCache)
 from mongoengine.queryset.visitor import Q
 
 
@@ -19,4 +17,3 @@ __all__ = (
     'DoesNotExist', 'InvalidQueryError', 'MultipleObjectsReturned',
     'NotUniqueError', 'OperationError',
 )
-
diff --git a/setup.cfg b/setup.cfg
index 6bf12cb5..67f66fa3 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -8,6 +8,6 @@ tests = tests
 
 [flake8]
 ignore=E501,F401,F403,F405,I201
-exclude=build,dist,docs,venv,.tox,.eggs,tests
+exclude=build,dist,docs,venv,venv3,.tox,.eggs,tests
 max-complexity=42
 application-import-names=mongoengine,tests