4 flake8 warning fixes

django/db/models/sql/query.py

@@ -17,7 +17,6 @@ from django.db.models.constants import LOOKUP_SEP
 from django.db.models.aggregates import refs_aggregate
 from django.db.models.expressions import ExpressionNode
 from django.db.models.fields import FieldDoesNotExist
-from django.db.models.lookups import Transform
 from django.db.models.query_utils import Q
 from django.db.models.related import PathInfo
 from django.db.models.sql import aggregates as base_aggregates_module

tests/admin_checks/models.py

@@ -7,6 +7,7 @@ from django.utils.encoding import python_2_unicode_compatible
 from django.contrib.contenttypes.models import ContentType
 from django.contrib.contenttypes.fields import GenericForeignKey
 
+
 class Album(models.Model):
     title = models.CharField(max_length=150)
 

tests/field_deconstruction/tests.py

@@ -318,4 +318,3 @@ class FieldDeconstructionTests(TestCase):
         self.assertEqual(path, "django.db.models.URLField")
         self.assertEqual(args, [])
         self.assertEqual(kwargs, {"max_length": 231})
-