diff --git a/docs/developer/extending.rst b/docs/developer/extending.rst
index 5927e07c..95f0cb54 100644
--- a/docs/developer/extending.rst
+++ b/docs/developer/extending.rst
@@ -206,7 +206,9 @@ Once you have created the models, add the following to your
     OPENWISP_RADIUS_RADIUSGROUP_MODEL = "myradius.RadiusGroup"
     OPENWISP_RADIUS_RADIUSTOKEN_MODEL = "myradius.RadiusToken"
     OPENWISP_RADIUS_PHONETOKEN_MODEL = "myradius.PhoneToken"
-    OPENWISP_RADIUS_ORGANIZATIONRADIUSSETTINGS_MODEL = "myradius.OrganizationRadiusSettings"
+    OPENWISP_RADIUS_ORGANIZATIONRADIUSSETTINGS_MODEL = (
+        "myradius.OrganizationRadiusSettings"
+    )
     OPENWISP_RADIUS_REGISTEREDUSER_MODEL = "myradius.RegisteredUser"
 
     # You will need to change AUTH_USER_MODEL if you are extending openwisp_users
@@ -313,7 +315,9 @@ resort to monkey patching, you can proceed as follows:
     RadiusGroupCheck = load_model("openwisp_radius", "RadiusGroupCheck")
     RadiusGroupReply = load_model("openwisp_radius", "RadiusGroupReply")
     RadiusUserGroup = load_model("openwisp_radius", "RadiusUserGroup")
-    OrganizationRadiusSettings = load_model("openwisp_radius", "OrganizationRadiusSettings")
+    OrganizationRadiusSettings = load_model(
+        "openwisp_radius", "OrganizationRadiusSettings"
+    )
     User = get_user_model()
 
     admin.site.unregister(RadiusCheck)
diff --git a/docs/user/settings.rst b/docs/user/settings.rst
index c29f4242..1c8dd4d7 100644
--- a/docs/user/settings.rst
+++ b/docs/user/settings.rst
@@ -539,7 +539,9 @@ means that the global setting specified in ``settings.py`` will be used.
 
 .. code-block:: python
 
-    {"__all__": "https://{site}/{organization}/password/reset/confirm/{uid}/{token}"}
+    {
+        "__all__": "https://{site}/{organization}/password/reset/confirm/{uid}/{token}"
+    }
 
 A dictionary representing the frontend URLs through which end users can
 complete the password reset operation.
@@ -869,7 +871,9 @@ type in the API response for ``ChilliSpot-Max-Input-Octets`` attribute:
 
 .. code-block:: python
 
-    OPENWISP_RADIUS_RADIUS_ATTRIBUTES_TYPE_MAP = {"ChilliSpot-Max-Input-Octets": "bytes"}
+    OPENWISP_RADIUS_RADIUS_ATTRIBUTES_TYPE_MAP = {
+        "ChilliSpot-Max-Input-Octets": "bytes"
+    }
 
 .. _radius_social_login_settings:
 
diff --git a/openwisp_radius/api/views.py b/openwisp_radius/api/views.py
index 30190cad..6bb21916 100644
--- a/openwisp_radius/api/views.py
+++ b/openwisp_radius/api/views.py
@@ -155,9 +155,9 @@ def get(self, request, *args, **kwargs):
         if radbatch.strategy == 'prefix':
             pdf = generate_pdf(radbatch.pk)
             response = HttpResponse(content_type='application/pdf')
-            response['Content-Disposition'] = (
-                f'attachment; filename="{radbatch.name}.pdf"'
-            )
+            response[
+                'Content-Disposition'
+            ] = f'attachment; filename="{radbatch.name}.pdf"'
             response.write(pdf)
             return response
         else:
diff --git a/openwisp_radius/tests/test_saml/utils.py b/openwisp_radius/tests/test_saml/utils.py
index 27a57099..3c173780 100644
--- a/openwisp_radius/tests/test_saml/utils.py
+++ b/openwisp_radius/tests/test_saml/utils.py
@@ -25,6 +25,6 @@ def add_outstanding_query(self, session_id, came_from):
             came_from,
         )
         self.saml_session.save()
-        self.client.cookies[settings.SESSION_COOKIE_NAME] = (
-            self.saml_session.session_key
-        )
+        self.client.cookies[
+            settings.SESSION_COOKIE_NAME
+        ] = self.saml_session.session_key