url 後面還可以加上預設值

預設值
   url(r'^index/', views.index, {'name': 'root'}),

urls.py url對應關係

from django.conf.urls import url
from django.contrib import admin

from app01 import views
urlpatterns = [
    url(r'^admin/', admin.site.urls),
    url(r'^index/', views.index),
]

預設情況是這樣

views.py 程式碼

from django.shortcuts import render
from django.shortcuts import HttpResponse
# Create your views here.

def index(request):
    return HttpResponse("index")

沒有問題 

傳遞引數

from django.conf.urls import url
from django.contrib import
 
 admin

from app01 import views
urlpatterns = [
    url(r'^admin/', admin.site.urls),
    # url(r'^index/', views.index),
    url(r'^index/', views.index,{'name':'root'}),
]

報錯了

因為在沒有傳遞形式引數給函式

 需要傳預設值時候，必須再加上一個形式引數接受一下，而名字根據字典key來定的

相當於給函式或類傳一個值

def
 
 index(request,name):
    print(name)
    return HttpResponse("index")

後臺拿到的

root
[07/Dec/2018 15:52:14] "GET /index/ HTTP/1.1" 200 5