diff --git a/rest_framework/compat.py b/rest_framework/compat.py
index fbb6a2863..fd4950527 100644
--- a/rest_framework/compat.py
+++ b/rest_framework/compat.py
@@ -4,14 +4,13 @@ versions of Django/Python, and compatibility wrappers around optional packages.
 """
 
 import sys
+from collections.abc import Mapping, MutableMapping  # noqa
 
 from django.conf import settings
 from django.core import validators
 from django.utils import six
 from django.views.generic import View
 
-from collections.abc import Mapping, MutableMapping   # noqa
-
 try:
     from django.urls import (  # noqa
         URLPattern,
diff --git a/tests/test_permissions.py b/tests/test_permissions.py
index c53dae18b..04fb3700f 100644
--- a/tests/test_permissions.py
+++ b/tests/test_permissions.py
@@ -8,7 +8,6 @@ from django.contrib.auth.models import AnonymousUser, Group, Permission, User
 from django.db import models
 from django.test import TestCase
 from django.urls import ResolverMatch
-from tests.models import BasicModel
 
 from rest_framework import (
     HTTP_HEADER_ENCODING, RemovedInDRF310Warning, authentication, generics,
@@ -19,6 +18,8 @@ from rest_framework.filters import DjangoObjectPermissionsFilter
 from rest_framework.routers import DefaultRouter
 from rest_framework.test import APIRequestFactory
 
+from tests.models import BasicModel
+
 factory = APIRequestFactory()
 
 
diff --git a/tests/test_utils.py b/tests/test_utils.py
index 17c1a9bef..996b3c8af 100644
--- a/tests/test_utils.py
+++ b/tests/test_utils.py
@@ -1,6 +1,5 @@
 from django.conf.urls import url
 from django.test import TestCase, override_settings
-from tests.models import BasicModel
 
 from rest_framework.decorators import action
 from rest_framework.routers import SimpleRouter
@@ -11,6 +10,8 @@ from rest_framework.utils.urls import remove_query_param, replace_query_param
 from rest_framework.views import APIView
 from rest_framework.viewsets import ModelViewSet
 
+from tests.models import BasicModel
+
 
 class Root(APIView):
     pass