课堂练习

练习使用selenium操作键盘进行下拉式翻页，以Bing搜索“中共一大会址”为关键字的图片搜索结果为例
思考：如何判断是否到底？

from selenium import webdriver
from selenium.webdriver.common.by import By
 
chrome_driver_file = r'C:\Program Files\Google\Chrome\Application\chromedriver.exe'
b = webdriver.Chrome(executable_path=chrome_driver_file)
url = "https://cn.bing.com/images/search?q=中共一大会址"
b.get(url)

pics = b.find_elements(By.XPATH, '//*[@id="mmComponent_images_1"]/ul/li')
print(len(pics))

C:\Users\fangb\AppData\Local\Temp\ipykernel_16472\60224640.py:5: DeprecationWarning: executable_path has been deprecated, please pass in a Service object
  b = webdriver.Chrome(executable_path=chrome_driver_file)

35

from selenium.webdriver.common.keys import Keys
from selenium.webdriver.common.action_chains import ActionChains
import time 

for i in range(3):
    ActionChains(b).key_down(Keys.END).key_up(Keys.END).perform()
    #暂停5秒等待页面加载
    time.sleep(5)
    pics = b.find_elements(By.XPATH, '//*[@id="mmComponent_images_1"]/ul/li')
    print(len(pics))

70
105
140

b.quit()