class ModelAdmin(BaseModelAdmin):
        ...
        # 配置类
        
        
    class AdminSite(object):
        def __init__(self, name=‘admin‘):
            self._registry = {}  # model_class class -> admin_class instance
        def register(self, model, admin_class=None, **options):
            """
            Registers the given model(s) with the given admin class.

            The model(s) should be Model classes, not instances.

            If an admin class isn‘t given, it will use ModelAdmin (the default
            admin options). If keyword arguments are given -- e.g., list_display --
            they‘ll be applied as options to the admin class.

            If a model is already registered, this will raise AlreadyRegistered.

            If a model is abstract, this will raise ImproperlyConfigured.
            """
            if not admin_class:
                admin_class = ModelAdmin
            # Instantiate the admin class to save in the registry
            self._registry[model] = admin_class(model)
    
    site = AdminSite()
        
    admin.py注册语句
    
    admin.site.register(models.Publish)  # 仅仅是将注册了的模型表和以模型表为参数实例化产生的对象
    # 当做键值对存入了site对象中的_registry字段
    
    #请看以下打印结果的示例
    

from django.contrib import admin
from app01 import models
# Register your models here.
# print(‘from app01 admin‘)
class BookConfig(admin.ModelAdmin):
    list_display = [‘title‘,‘price‘,‘publish_date‘,‘publish‘]
    list_display_links = [‘title‘,‘price‘]
    search_fields = [‘title‘,‘price‘]
    list_filter = [‘publish‘,‘authors‘]

    def patch_init(self,request,queryset):
        queryset.update(price=666)

    patch_init.short_description = ‘价格批量修改‘
    actions = [patch_init]

admin.site.register(models.Book,BookConfig)
admin.site.register(models.Publish)
admin.site.register(models.Author)
admin.site.register(models.AuthorDetail)

print(admin.site._registry)

多出的前两条是django-admin默认的两张表，而字典中的key是类名也就是可以加括号调用，并不是字符串；value是以模型表为参数产生的对象，而这个类默认是ModelAdmin,  除非自定义
，如BookConfig

    """
    {
    <class ‘django.contrib.auth.models.Group‘>: <django.contrib.auth.admin.GroupAdmin object at 0x000001A7689CE438>, 
    <class ‘django.contrib.auth.models.User‘>: <django.contrib.auth.admin.UserAdmin object at 0x000001A768A03908>,
    <class ‘app01.models.Book‘>: <app01.admin.BookConfig object at 0x000001A768A03978>, 
    <class ‘app01.models.Publish‘>: <django.contrib.admin.options.ModelAdmin object at 0x000001A768A1A400>,
    <class ‘app01.models.Author‘>: <django.contrib.admin.options.ModelAdmin object at 0x000001A768A1A518>, 
    <class ‘app01.models.AuthorDetail‘>: <django.contrib.admin.options.ModelAdmin object at 0x000001A768A1A550>
    }
    
    """

def get_urls(self):
        urlpatterns = [
            url(r‘^$‘, wrap(self.index), name=‘index‘),
            url(r‘^login/$‘, self.login, name=‘login‘),
            url(r‘^logout/$‘, wrap(self.logout), name=‘logout‘),
            url(r‘^password_change/$‘, wrap(self.password_change, cacheable=True), name=‘password_change‘),
            url(r‘^password_change/done/$‘, wrap(self.password_change_done, cacheable=True),
                name=‘password_change_done‘),
            url(r‘^jsi18n/$‘, wrap(self.i18n_javascript, cacheable=True), name=‘jsi18n‘),
            url(r‘^r/(?P<content_type_id>\d+)/(?P<object_id>.+)/$‘, wrap(contenttype_views.shortcut),
                name=‘view_on_site‘),
        ]
        return urlpatterns
    
    @property
    def urls(self):
        return self.get_urls(), ‘admin‘, self.name



url(r‘^admin/‘, admin.site.urls)
##admin.site.urls （点击urls，urls是装饰成属性的方法，返回的是一个元组，跟路由的本质一致，get_urls是装有多个路由的列表）

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


from django.shortcuts import HttpResponse


def test1(request):
    return HttpResponse(‘test1‘)


def test2(request):
    return HttpResponse(‘test2‘)



urlpatterns = [
    url(r‘^admin/‘, admin.site.urls),
    url(r‘^index/‘,([
            url(r‘^test1/‘,test1),
            url(r‘^test2/‘,test2),
                    ],None,None))
]

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


from django.shortcuts import HttpResponse


def test1(request):
    return HttpResponse(‘test1‘)


def test2(request):
    return HttpResponse(‘test2‘)


def test3(request):
    return HttpResponse(‘test3‘)
def test4(request):
    return HttpResponse(‘test4‘)
def test5(request):
    return HttpResponse(‘test5‘)
def test6(request):
    return HttpResponse(‘test6‘)
urlpatterns = [
    url(r‘^admin/‘, admin.site.urls),
    url(r‘^index/‘,([
            url(r‘^test1/‘,([
                    url(r‘^test1_1/‘,test3),
                    url(r‘^test1_2/‘,test4),
                    url(r‘^test1_3/‘,test5),
                    url(r‘^test1_4/‘,test6),
                            ],None,None)),
            url(r‘^test2/‘,test2),
                    ],None,None))
]