admin 的请求流程：

1 启动：

import admin
def autodiscover():
autodiscover_modules('admin', register_to=site)

执行每一个app下的admin.py文件

2 注册，

3 设计URL

class ArticleConfig(admin.ModelAdmin):    def deletes(self):        return mark_safe("<a href="">删除</a>")    list_display = ["title", "desc", "create_time","nid",deletes]  # 页面显示的字段及内容list_display_links = ["title"]   # 增加点击的再短list_filter = ['title',"user"]  # 右侧列表显示的 字段内容，可点击list_editable = ["desc","nid"]  # 在页面中修改search_fields = ["title", "desc"]   # 增加一个搜索框，模糊匹配字段内容    # change_list_template = "login.html"   # 更改admin页面fields = ("user",)   # 点击字段，跳转到下个页面的内容　　 单例模式方式1 ：__new__

class Singleton(object):

     _instance = None
    def __new__(cls, *args, **kw):
         if not cls._instance:
             cls._instance = super(Singleton, cls).__new__(cls, *args, **kw)
         return cls._instance

class MyClass(Singleton):
     a = 1方式2  导入模块from mysingleton import my_singleton,My_Singleton

 my_singleton.foo()

 print(id(my_singleton))

• admin详情 ： https://www.cnblogs.com/yuanchenqi/articles/8323452.html

  class ArticleConfig(admin.ModelAdmin): def deletes(self): return mark_safe("删除") list_display = ["title", "desc", "create_time","nid",deletes] # 页面显示的字段及内容list_display_links = ["title"] # 增加点击的再短list_filter = ['title',"user"] # 右侧列表显示的 字段内容，可点击list_editable = ["desc","nid"] # 在页面中修改search_fields = ["title", "desc"] # 增加一个搜索框，模糊匹配字段内容 # change_list_template = "login.html" # 更改admin页面fields = ("user",) # 点击字段，跳转到下个页面的内容