django urls里面 include写namespace会

在Django URL里面想添加namespace='****'
于是：

urlpatterns = [
    path('admin/', admin.site.urls),
    url(r'^$', include('users.urls', namespace='  ')),
]

但是报错：

Specifying a namespace in include() without providing an app_name '
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

这种情况小小修改一下就OK了：

urlpatterns = {
    path('admin/', admin.site.urls),
    url(r'^$', include(('users.urls', 'users'), namespace='users')),
}

注意!!!!

namesapace = ***， 写入include()函数的时候记得要用括号包住
include(('users.urls', 'users'), namespace='users')

不然，这样的话namespace = ***就不在include（）函数里面包含了，例如：

url(r'^$', include('users.urls', 'users'), namespace='users'),