如何在Selenium + Python中捕获失败的测试用例的屏幕截图？我可以获取页面的屏幕截图，但是在捕获失败的测试用例的屏幕截图时会遇到困难。

码：

def test_2new(self):

   driver = self.driver driver.get("google.com") 
   driver.find_element_by_name("q").send_keys("Automation") 
   driver.set_page_load_timeout(10) 
   driver.find_element_by_name("btnK").click() 
   self.assertTrue("something.com" in self.driver.current_url) 
   print("Google Search")

@classmethod
def tearDownClass(cls):

    # cls.driver.refresh() 
    time.sleep(5) 
    if sys.exc_info()[0]: 
         cls.driver.save_screenshot(r"C:\Users\ANCP2\sample.png")