つまり、以下の execute_script() で OK です
def subtest_input_radio(self,test_url): for elm_name in ["build_time"]: self.driver.get(test_url) # 対象urlへaccess self.input_all_valid(test_url) # まず全項目に正しく入力 form_elms = self.driver.find_elements_by_name(elm_name) for form_elm in form_elms: if form_elm.is_selected(): js_str = "".join(["for( elm of document.getElementsByName('", elm_name, "')) elm.checked = false;"]) self.driver.execute_script(js_str) self.driver.find_element_by_id("submit").click() time.sleep(3) # 入力内容に問題なければ、#formErrorにerror msgなしor次の画面へ遷移 err_msg_elms = self.driver.find_elements_by_class_name("errWrap") self.assertNotEqual("", err_msg_elms[0].text, elm_name +" not selected")