diff --git a/mathics_django/server.py b/mathics_django/server.py
index 4f9b5c916..96c5b6ec3 100755
--- a/mathics_django/server.py
+++ b/mathics_django/server.py
@@ -1,21 +1,24 @@
-#!/usr/bin/env python
 # -*- coding: utf-8 -*-
 
 
-import sys
+import argparse
+import errno
 import os
 import os.path as osp
-import argparse
 import socket
-import errno
 import subprocess
+import sys
 
 import mathics
-from mathics_django import server_version_string, license_string
-from mathics_django import settings as mathics_settings  # Prevents UnboundLocalError
-from mathics_django.version import __version__ as django_frontend_version
 from mathics.settings import DATA_DIR
 
+from mathics_django import (  # Prevents UnboundLocalError
+    license_string,
+    server_version_string,
+    settings as mathics_settings,
+)
+from mathics_django.version import __version__ as django_frontend_version
+
 
 def check_database():
     # Check for the database
@@ -107,7 +110,7 @@ def launch_app(args):
         addr = "127.0.0.1"
 
     try:
-        from django.core.servers.basehttp import run, get_internal_wsgi_application
+        from django.core.servers.basehttp import get_internal_wsgi_application, run
 
         handler = get_internal_wsgi_application()
         run(addr, port, handler)
diff --git a/mathics_django/urls.py b/mathics_django/urls.py
index b1734b978..822414f66 100644
--- a/mathics_django/urls.py
+++ b/mathics_django/urls.py
@@ -1,9 +1,9 @@
 # -*- coding: utf-8 -*-
 
 
-from django.urls import re_path, include
-from django.conf.urls.static import static
 from django.conf import settings
+from django.conf.urls.static import static
+from django.urls import include, re_path
 
 handler404 = "mathics_django.web.views.error_404_view"
 handler500 = "mathics_django.web.views.error_500_view"
diff --git a/mathics_django/web/urls.py b/mathics_django/web/urls.py
index f276173a4..46898b6ac 100644
--- a/mathics_django/web/urls.py
+++ b/mathics_django/web/urls.py
@@ -17,7 +17,6 @@
     doc_subsection,
 )
 
-
 # These are the callback functions.
 from mathics_django.web.views import (
     delete,