Fix django.conf.url deprecation in django 4.0

README.md

@@ -75,7 +75,14 @@ Add a URL entry to your project’s urls.py, for example:
 
 ```python
 from django.conf import settings
-from django.conf.urls import include, url
+from django.conf.urls import include
+
+try:
+    from django.conf.urls import url
+except ImportError:
+    # Django 4.0 replaced url by something else
+    # See https://stackoverflow.com/a/70319607/2519059
+    from django.urls import re_path as url
 
 urlpatterns = [
     # Your own url pattern here

example_project/example_project/urls.py

@@ -13,7 +13,14 @@
     1. Import the include() function: from django.conf.urls import url, include
     2. Add a URL to urlpatterns:  url(r'^blog/', include('blog.urls'))
 """
-from django.conf.urls import include, url
+from django.conf.urls import include
+
+try:
+    from django.conf.urls import url
+except ImportError:
+    # Django 4.0 replaced url by something else
+    # See https://stackoverflow.com/a/70319607/2519059
+    from django.urls import re_path as url
 from django.contrib import admin
 
 urlpatterns = [url(r"^admin/", admin.site.urls), url(r"^survey/", include("survey.urls"))]

setup.py

@@ -18,7 +18,7 @@
     LONG_DESCRIPTION = f.read()
 
 DEPENDENCIES = [
-    "django>=2.2,<4",
+    "django>=2.2",
     "django-bootstrap-form>=3.4",
     "django-tastypie>=0.14.2",
     "django-registration>=3.0",

survey/urls.py

@@ -1,4 +1,9 @@
-from django.conf.urls import url
+try:
+    from django.conf.urls import url
+except ImportError:
+    # Django 4.0 replaced url by something else
+    # See https://stackoverflow.com/a/70319607/2519059
+    from django.urls import re_path as url
 
 from survey.views import ConfirmView, IndexView, SurveyCompleted, SurveyDetail
 from survey.views.survey_result import serve_result_csv

urls.py

@@ -1,6 +1,13 @@
 # pylint: disable=invalid-name
 
-from django.conf.urls import include, url
+from django.conf.urls import include
+
+try:
+    from django.conf.urls import url
+except ImportError:
+    # Django 4.0 replaced url by something else
+    # See https://stackoverflow.com/a/70319607/2519059
+    from django.urls import re_path as url
 from django.contrib import admin
 from django.shortcuts import redirect
 from django.urls.base import reverse