diff --git a/oauth2_provider/oauth2_backends.py b/oauth2_provider/oauth2_backends.py
index f04463d2..accd9d3f 100644
--- a/oauth2_provider/oauth2_backends.py
+++ b/oauth2_provider/oauth2_backends.py
@@ -1,11 +1,11 @@
 import json
 from urllib.parse import urlparse, urlunparse
 
+from django.http import HttpRequest
 from oauthlib import oauth2
 from oauthlib.common import Request as OauthlibRequest
 from oauthlib.common import quote, urlencode, urlencoded
 from oauthlib.oauth2 import OAuth2Error
-from django.http import HttpRequest
 
 from .exceptions import FatalClientError, OAuthToolkitError
 from .settings import oauth2_settings
diff --git a/oauth2_provider/oauth2_validators.py b/oauth2_provider/oauth2_validators.py
index 7e7c36e9..9bb94c0a 100644
--- a/oauth2_provider/oauth2_validators.py
+++ b/oauth2_provider/oauth2_validators.py
@@ -56,7 +56,7 @@
         AbstractApplication.GRANT_CLIENT_CREDENTIALS,
         AbstractApplication.GRANT_OPENID_HYBRID,
     ),
-    "urn:ietf:params:oauth:grant-type:device_code": (AbstractApplication.GRANT_DEVICE_CODE,)
+    "urn:ietf:params:oauth:grant-type:device_code": (AbstractApplication.GRANT_DEVICE_CODE,),
 }
 
 Application = get_application_model()
@@ -167,8 +167,9 @@ def _authenticate_basic_auth(self, request):
         elif request.client.client_id != client_id:
             log.debug("Failed basic auth: wrong client id %s" % client_id)
             return False
-        elif (request.client.client_type == "public"
-              and request.grant_type == "urn:ietf:params:oauth:grant-type:device_code"
+        elif (
+            request.client.client_type == "public"
+            and request.grant_type == "urn:ietf:params:oauth:grant-type:device_code"
         ):
             return True
         elif not self._check_secret(client_secret, request.client.client_secret):
diff --git a/oauth2_provider/urls.py b/oauth2_provider/urls.py
index 5bc9586b..e7dfe848 100644
--- a/oauth2_provider/urls.py
+++ b/oauth2_provider/urls.py
@@ -11,7 +11,7 @@
     path("token/", views.TokenView.as_view(), name="token"),
     path("revoke_token/", views.RevokeTokenView.as_view(), name="revoke-token"),
     path("introspect/", views.IntrospectTokenView.as_view(), name="introspect"),
-    path("device_authorization/", views.DeviceAuthorizationView.as_view(), name="device-authorization")
+    path("device_authorization/", views.DeviceAuthorizationView.as_view(), name="device-authorization"),
 ]