old_contents: from django.contrib import admin
  from django.contrib.auth import get_user_model
  
  User = get_user_model()
  
  admin.site.register(User)
  
new_contents: from django.contrib import admin
  from django.contrib.auth import get_user_model
  
  User = get_user_model()
  
  class UserAdmin(admin.ModelAdmin):
  	list_display = ('username', 'email', 'is_staff')
  	readonly_fields = ('username', 'last_login', 'date_joined', 'email')
  	exclude = ('password',)
  
  admin.site.register(User, UserAdmin)
  
subject: Add UserAdmin class