一. 打印百度首页底部的声明
如图,想打印@2018 Baidu...后面的一长串文字,可以通过class name定位的形式
可以看出,只有一个class name是"copyright-text"的元素
二. 代码实现
from selenium import webdriver import time driver = webdriver.Chrome() driver.get("http://www.baidu.com") time.sleep(2) #class="copyright-text" 元素的文本信息 data = driver.find_element_by_class_name("copyright-text").text #打印信息 print(data) time.sleep(3) driver.quit()
运行结果报错了:selenium.common.exceptions.NoSuchElementException: Message: no such element: Unable to locate element:
大意是元素定位失败,找不到class为"copyright-text"的元素
D:\Program\python34\python.exe D:/python_workshop/python6/selenium_webdriver/test_9.py Traceback (most recent call last): File "D:/python_workshop/python6/selenium_webdriver/test_9.py", line 11, in <module> data = driver.find_element_by_class_name("copyright-text").text File "D:\Program\python34\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 555, in find_element_by_class_name return self.find_element(by=By.CLASS_NAME, value=name) File "D:\Program\python34\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 955, in find_element 'value': value})['value'] File "D:\Program\python34\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 312, in execute self.error_handler.check_response(response) File "D:\Program\python34\lib\site-packages\selenium\webdriver\remote\errorhandler.py", line 242, in check_response raise exception_class(message, screen, stacktrace) selenium.common.exceptions.NoSuchElementException: Message: no such element: Unable to locate element: {"method":"class name","selector":"copyright-text"} (Session info: chrome=66.0.3359.139) (Driver info: chromedriver=2.35.528161 (5b82f2d2aae0ca24b877009200ced9065a772e73),platform=Windows NT 6.1.7600 x86_64) Process finished with exit code 1
三. 原因分析
检查chromedriver驱动的浏览器,发现百度首页底部的那一串声明竟然跑到下一行去了,而且是id="cp",用的是id选择器而非class,看来驱动浏览器和真实浏览器同一地方的元素、属性可能会有差异,此时需要修改代码了
四. 修改代码和总结
from selenium import webdriver import time driver = webdriver.Chrome() driver.get("http://www.baidu.com") time.sleep(2) #class="copyright-text" 元素的文本信息 data = driver.find_element_by_id("cp").text #修改部分 #打印信息 print(data) time.sleep(3) driver.quit()
运行结果:
©2018 Baidu 使用百度前必读 意见反馈 京ICP证030173号 京公网安备11000002000001号