一、在Django <= 1.11 我们通过关键词namespace参数定义名称空间
1、projects/urls.py
from django.conf.urls import url,include
urlpatterns = [
url(r'blog/', include('blog.urls', namespace='blog'))
]2、apps/urls.py
from django.conf.urls import url
from . import views
urlpatterns = [
url(r'^login/$', views.login, name="login"),
]二、在Django 2.0+ 我们可以省略namespace，把namespace定义到被include的urls.py中去，使用app_name定义名称空间。
1、projects/urls.py
urlpatterns = [
path(r'^blog/', include('blog.urls'))
]2、apps/urls.py
from django.urls import path
from . import views
app_name = 'blog'
urlpatterns = [
path('login/', views.login, name="login"),
]三、在templates中我们还是像原来一样的使用方法
{% url 'blog:login' %}