selenium web中的下拉选项操作

from selenium import webdriver
from selenium.webdriver.support.ui import webdriverwait
from selenium.webdriver.common.action_chains import  ActionChains
from selenium .webdriver.support.select import Select
from selenium.webdriver.support import expected_conditions as EC
from selenium.webdriver.common.by import By
from selenium.common.exceptions import TimeoutException,NoSuchElementException
driver = webdriver.Chrome()
driver.get("https://baidu.com")
wait=webdriverwait(driver,10) #显示等待
try:
    # 鼠标移动到设置按钮
    setting_element=wait.until(EC.presence_of_element_located((
        By.LINK_TEXT,"设置"
    )))
    action_chains=ActionChains(driver)
    action_chains.move_to_element(setting_element).perform()
    # 点击高级设置
    wait.until(EC.presence_of_element_located((
        By.XPATH, "//div[@class='bdpfmenu']//a[contains(text(),'高级搜索')]"
    ))).click()


    # 方法一：定位到下拉框，再点击选项

    wait.until(EC.presence_of_element_located((By.XPATH, "//select[@name='gpc']/option[4]"))).click()


    # 方法二 使用Select模块
    format_selector=Select(wait.until(EC.presence_of_element_located((
        By.XPATH,"//select[@name='ft']"
    ))))

    # format_selector.select_by_value("all")
    # format_selector.select_by_visible_text("所有格式")
    format_selector.select_by_index(6) #从0开始计算的

    wait.until(EC.presence_of_element_located((
        By.XPATH,"//input[@id='adv_keyword']"
    ))).send_keys("柠檬班")

    wait.until(EC.presence_of_element_located((
        By.XPATH,"//input[@class='advanced-search-btn']"
    ))).click()

    # 获取当前窗口数
    windows=driver.window_handles
    # 切换到最新的窗口
    driver.switch_to.window(windows[-1])
    file_name="lefix"+".png"
    driver.get_screenshot_as_file(file_name)
except (TimeoutException,NoSuchElementException) as e:
    print("出现异常{}".format(e))

finally:
    driver.quit()