執行環境
PyCharm 2017.1 
Django 2.0.1 
python 3.6.1

在網頁專案中使用include()方法
專案目錄中同時存在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')),
]
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在app/urls.py中對應url
from django.urls import path
from
 
 .views import index
urlpatterns = [
    path('',index,name='index'),
]
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runserver發生錯誤
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.
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意思為： 
在include方法裡面指定namespace卻不提供app_name是不允許的。 
在包含的模組裡設定app_name變數，或者在include方法裡面提供app_name引數。

解決方法
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'
 
)),
]
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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'),
]