python - Why switching to alert through selenium is not stable?

Question

Why switching to alert through selenium is not stable?

For example.
1. Run a code and all good. Everything worked out well. But if this code is run in a few minutes, then there may be errors. There is no element you can click on, for example. And so on.
2. On one site there is an alert window.

alert = driver.switch_to_alert()
alert.dismiss()

So I close it. But he works through time. All is well, then errors.

for al in range(3):
    try:
        alert = driver.switch_to_alert()
        alert.dismiss()
        time.sleep(randint(1, 3))
    except:
        pass

I wrote and everything works out as it should.
But I think that this is not beautiful.
Why is everything so unstable?
Thank you very much.

Answer 1

As per your code block there are a couple of issues which you need to address as follows :

• Switching to an Alert : The method switch_to_alert() is Deprecated and you should be using switch_to.alert instead. The API Docs clearly mentions the following :

   def switch_to_alert(self):
       """ Deprecated use driver.switch_to.alert
       """
       warnings.warn("use driver.switch_to.alert instead", DeprecationWarning)
       return self._switch_to.alert
  

• Wait for the Alert to be present : You should always induce WebDriverWait for the Alert to be present before invoking accept() or dismiss() as follows :

  WebDriverWait(driver, 5).until(EC.alert_is_present).dismiss()