在创建博客超链接的时候，django报错：without providing an app_name is not supported. Set the app_name attribute in t

报错信息：

without providing an app_name is not supported. Set the app_name attribute in the included module, or pass a 2-tuple con

具体代码如下：

from django.contrib import admin
from django.urls import path,include
from django.conf.urls import url,include


urlpatterns = [
    url('admin/', admin.site.urls),
    url('blog/',include('blog.urls')),
    url('blog2/',include('blog2.urls',namespace='blog2'))
]

include函数包含两个参数，第一个是arg，第二个是namespace，arg应该是一个二元元组，但是代码中给的只是一个blog2.urls，所以代码改成如下样式：

url('blog2/',include(('blog2.urls','blog2'),namespace = 'blog2'))

然后重新runserver，正常运行