text: from __future__ import unicode_literals
  
  from django.contrib import admin
  
  from simple_history.admin import SimpleHistoryAdmin
  from .models import Poll, Choice, Person, Book, Document, Paper, Employee
  
  
  class PersonAdmin(SimpleHistoryAdmin):
      def has_change_permission(self, request, obj=None):
          return False
  
  
  admin.site.register(Poll, SimpleHistoryAdmin)
  admin.site.register(Choice, SimpleHistoryAdmin)
  admin.site.register(Person, PersonAdmin)
  admin.site.register(Book, SimpleHistoryAdmin)
  admin.site.register(Document, SimpleHistoryAdmin)
  admin.site.register(Paper, SimpleHistoryAdmin)
  admin.site.register(Employee, SimpleHistoryAdmin)
  