场景：selenium的下拉选项是ul-li模式，选定某个指定的选项。

from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC  # 显示等待
    def select_li(self, text, *ul_locator):
        """
        定位ul_li下拉选项中某个指定的下拉选项li
        :param text: 预期的输入项
        :param ul_locator: 定位到ul元素
        :return:
        """
        try:
            ul_ele = WebDriverWait(self.driver, self.WAIT_TIME, 1).until(EC.visibility_of_element_located((ul_locator)))
        except Exception as e:
            self.logger.error("ul元素在{}秒内定位失败: {}".format(self.WAIT_TIME, ul_locator))
        else:
            lis = ul_ele.find_elements('tag name', 'li')  # 拼接定位元素li
            for i in range(1, len(lis) + 1):
                # 拼接下拉选项的css locator的定位元素
                li = ul_locator[1] + ">li:nth-child(" + str(i) + ")>span"

                ele = WebDriverWait(self.driver, self.WAIT_TIME, 1).until(
                        EC.presence_of_element_located((By.CSS_SELECTOR, li)))
                if text in ele.text:  # 判断某个定位元素li的text是否是要选定的选项
                    ele.click()     # 点击下拉选项
                else:
                    self.logger.error("li元素在{}秒内定位失败".format(self.WAIT_TIME))