def render(self):
        return format_html('<ul{}>\n{}\n</ul>',
                           flatatt(self.attrs),
                           format_html_join('\n', '<li>{}</li>',
                                            ((force_text(w),) for w in self)))
Rejects configuration if hostname mapping is invalid.
dataset/ETHPy150Open django/django/django/contrib/admin/widgets.py/AdminRadioFieldRenderer.render--crossover with--dataset/ETHPy150Open ClusterHQ/flocker/benchmark/test/test_script.py/ClusterConfigurationTests.test_environment_hostname_mapping_invalid_ipaddress