Python，Selenium：如何检查元素的存在？

Question

我试图一次浏览一个网站，点击元素next，在HTML 代码中是class="pg-next"。不过，最终我会走到尽头，不会再有next 元素，此时我想停止循环。我有这样的事情：

pg_next_exists = True
while pg_next_exists:
    #
    # carry out necessary actions
    #
    if ...: # if the pg-next element can be found
        pass
    else:
        pg_next_exists = False # at which point the while loop stops

如何检查该元素是否仍然存在？

Answer 1

你为什么不使用wait试试这样的东西

from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.common.by import By
from selenium.webdriver.support import expected_conditions as EC

browser = webdriver.Firefox()
browser.get('http://example.com/')

try:
     wait = WebDriverWait(browser, 10) 
     search = wait.until(EC.element_to_be_clickable((By.CLASS_NAME, 'next')))
     search.click()
except:
     # Process element not found here