Python NameError: name 'include' is not defined [closed]

添加下面代码后：

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

有时候运行会出现如下错误：

Python NameError: name 'include' is not defined [closed]

可能是漏了添加模块，加入以下语句就好了：

from django.conf.urls import include