new_contents: from django.contrib.auth.models import User, Permission
  from djangotoolbox.contrib.auth.models import PermissionList
  
  def add_permission_to_user(user, perm):
      try:
          perm_list = PermissionList.objects.get(user=user)
      except PermissionList.DoesNotExist:
          perm_list = PermissionList.objects.create(user=user)
  
      perm_list._permission_list.append(perm.id)
      perm_list.save()
  
subject: add add_permission_to_user