当网站上显示错误消息时，如何打印消息

Question

嗨，我正在尝试使用selenium抓取一个网站，有时网站会阻止我的ip进行抓取，并出现一条弹出消息

我想做的是，每当弹出消息出现时，它就会在我的终端上显示一条警告，我的代码就是这样得到结果的

blo = driver.find_element_by_xpath('/html/body/div[2]/div/div/div[1]/h3')
if blo:
    print('ip blocked')
else:
    print('eroor')

但它不工作，我只是得到一个空白屏幕，我如何才能解决这个问题

元素的HTML：

<h3 class="modal-title">Notifications</h3>
<div class="alert alert-warning">Sorry, you have exceeded the maximum number of queries allowed per day. If you believe you have reached this message in error, please contact our support team.</div>

Answer 1

验证弹出消息是否存在，您必须为visibility_of_element_located()导入WebDriverWait，并且您可以使用以下任一Locator Strategies：

• 使用CSS_SELECTOR：

  try:
      WebDriverWait(driver, 20).until(EC.visibility_of_element_located((By.XPATH, "h3.modal-title+div.alert.alert-warning")))
      print("ip blocked")
  except TimeoutException:
      print("eroor")
  

• 使用XPATH：

  try:
      WebDriverWait(driver, 20).until(EC.visibility_of_element_located((By.XPATH, "//h3[@class='modal-title' and text()='Notifications']//following::div[@class='alert alert-warning']")))
      print("ip blocked")
  except TimeoutException:
      print("eroor")