django2 中include（）的使用

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运行环境

win7
Django 2.0
python 3.7

在网页项目中使用include()方法

• 项目目录中同时存在app/urls.py和proj/urls.py
• 在proj/urls.py使用include方法

  from django.urls import path,include
  from app import urls as app_url
  urlpatterns = [path('', include(app_url, namespace='common')),
  ]

  
  

• 在app/urls.py中对应url

  from django.urls import path
  from .views import index
  urlpatterns = [path('',index,name='index'),
  ]

runserver发生错误

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.

意思为： 
在include方法里面指定namespace却不提供app_name是不允许的。 
在包含的模块里设置app_name变量，或者在include方法里面提供app_name参数。

解决方法

方法1：在proj/urls.py中修改

from django.urls import path,include
from app import urls as app_url
urlpatterns = [path('', include((common_url,'common'), namespace='common')),
]

方法2：在app/urls.py中修改

from django.urls import path
from .views import index
app_name='common'
urlpatterns = [path('',index,name='index'),
]