Flake8 corrections

django/db/models/sql/compiler.py

@@ -958,8 +958,7 @@ class SQLUpdateCompiler(SQLCompiler):
                     raise TypeError("Database is trying to update a relational field "
                                     "of type %s with a value of type %s. Make sure "
                                     "you are setting the correct relations" %
-                                     (field.__class__.__name__,
-                                     val.__class__.__name__))
+                                    (field.__class__.__name__, val.__class__.__name__))
             else:
                 val = field.get_db_prep_save(val, connection=self.connection)
 

tests/invalid_models_tests/test_relative_fields.py

@@ -3,7 +3,6 @@ from __future__ import unicode_literals
 
 from django.core.checks import Error
 from django.db import models
-from django.db.models.fields import FieldDoesNotExist
 from django.test.utils import override_settings
 from django.test.testcases import skipIfDBFeature
 

tests/model_fields/models.py

@@ -48,6 +48,7 @@ class Whiz(models.Model):
 class BigD(models.Model):
     d = models.DecimalField(max_digits=38, decimal_places=30)
 
+
 class FloatModel(models.Model):
     size = models.FloatField()