def directory_select(self, message, default=None, cli_flag=None):
        return self.input(message, default, cli_flag)
Deleting an instance of a model proxying a multi-table inherited
dataset/ETHPy150Open letsencrypt/letsencrypt/certbot/display/util.py/NoninteractiveDisplay.directory_select--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.5/tests/modeltests/proxy_model_inheritance/tests.py/MultiTableInheritanceProxyTest.test_model_subclass_proxy