def can_attach_files(self, forum, user):
        return self._perform_basic_permission_check(forum, user, 'can_attach_file')
Construct ListProperty.
dataset/ETHPy150Open ellmetha/django-machina/machina/apps/forum_permission/handler.py/PermissionHandler.can_attach_files--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/google/appengine/ext/db/__init__.py/ListProperty.__init__