from selenium import webdriver

from selenium.webdriver.support.wait import WebDriverWait

from selenium.webdriver.support import expected_conditions as EC

from selenium.webdriver.common.by import By

from selenium.webdriver.support.ui import Select

driver = webdriver.Chrome()

driver.get("https://www.baidu.com/")

driver.maximize_window()

# 点击设置按钮

driver.find_element_by_xpath('//div[@id="u1"]//a[@name="tj_settingicon"]').click()

# 等待元素可见

WebDriverWait(driver,20).until(EC.visibility_of_element_located((By.XPATH,'//a[text()="高级搜索"]')))

# 点击高级搜索

driver.find_element_by_xpath('//a[text()="高级搜索"]').click()

# 选择所有格式，定位select标签

select_ment = driver.find_element_by_xpath('//select[@name="ft"]')
# 实例化select对象

s = Select(select_ment)
# 执行操作

s.select_by_visible_text('所有格式')
# 退出浏览器

driver.quit()