在工程文件中url 定义namespace需要
from django.contrib import admin
from django.urls import path,include
from django.conf.urls import url
urlpatterns = [
path('admin/', admin.site.urls),
url(r'^liu/',include('myApp.urls',namespace='app')),
]在myApp 的urls中 加这句 app_name='[myApp]'
from . import views
app_name='[myApp]'
urlpatterns = [
url(r'^$', views.index,name="index"),
url(r'index.html', views.index1),
