如何在python自动化中处理没有这样的异常，

Question

elem = driver.find_element_by_id("msgButtonAffirm")
if elem.is_displayed():
    elem.click()
    print("conform popup is avalable and click")
else:
    print "Pop-up is not visible"

Answer 1

您可以使用find_elements_by_id并检查列表中是否有任何内容

elem = driver.find_elements_by_id("msgButtonAffirm")
if elem and elem[0].is_displayed():
    elem[0].click()
    print("conform popup is avalable and click")
else:
    print("Pop-up is not visible")

Answer 2

您可以导入异常并按以下方式进行处理：

from selenium.common.exceptions import NoSuchElementException

try:
    elem = driver.find_element_by_id("msgButtonAffirm")
    elem.click()
    print("conform popup is avalable and click")
except NoSuchElementException:  
    print("Pop-up is not visible")

Answer 3

你需要注意几件事：

• 当点击确认弹出窗口时，你不应该把重点放在处理NoSuchElementException
• 历史上，在大多数情况下，确认弹出窗口驻留在模态对话框中，因此需要归纳WebDriverwait

相关的HTML可以帮助我们更好地分析这个问题。但是，根据上述要点，您需要将WebDriverWaitfor expected_conditions归纳为^{}，并且您可以使用以下Locator Strategies之一：

• 使用CSS_SELECTOR：

  try:
      WebDriverWait(driver, 20).until(EC.element_to_be_clickable((By.CSS_SELECTOR, "#msgButtonAffirm"))).click()
      print ("Pop-up was clickable and clicked")
  except TimeoutException: 
      print ("Pop-up was not clickable")
  

• 使用XPATH：

  try:
      WebDriverWait(driver, 20).until(EC.element_to_be_clickable((By.XPATH, "//*[@id='msgButtonAffirm']"))).click()
      print ("Pop-up was clickable and clicked")
  except TimeoutException: 
      print ("Pop-up was not clickable")
  

• 注意：必须添加以下导入：

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