django.core.exceptions.ImproperlyConfigured: Specifying a namespace in include() without providing an app_name is not supported.

django.core.exceptions.ImproperlyConfigured: Specifying a namespace in include() without providing an app_name is not supported. Set the app_name attribute in the included module, or pass a 2-tuple containing the list of patterns and app_name instead.

改成如下形式：

1 from django.contrib import admin
2 from django.urls import path
3 from django.conf.urls import url, include
4
5 urlpatterns = [
6     path('admin/', admin.site.urls),
7     url(r'^app/', include('App.urls')),
8     url(r'^two/', include(('Two.urls', 'second'),namespace='second')),
9 ]

参考链接：https://blog.csdn.net/jason_cdd/article/details/106953974