old_contents: from django.contrib import admin
  
  # Register your models here.
  
new_contents: from django.contrib import admin
  from sites.models import *
  
  @admin.register(Sites)
  class SitesAdmin (admin.ModelAdmin):
      list_display = ('name',)
  
  @admin.register(Site)
  class SiteAdmin (admin.ModelAdmin):
      list_display = ('site_id','date','a_value','b_value')
      #list_editable = ('date','a_value','b_value') # Make the item editable directly in the list
  
  # Register your models here.
  
subject: Use the Django Admin