During handling UnexpectedAlertPresentException, NoAlertPresentException occurs in python selenium

Question

I was handling UnexpectedAlertPresentException which often occurs, So I made try-except codes to deal with it. I was about to return the content of Unexpected Alert, So My code is

wait = WebDriverWait(driver2, 10)
try:
    element = wait.until(EC.element_to_be_clickable((By.NAME, 'wlike_limit')))
except UnexpectedAlertPresentException:
    print("UnexpectedAlertPresentException, ",driver2.switch_to.alert.text)

But it also gives me "NoAlertPresentException" while trying to print the text of the unexpected alert.

UnexpectedAlertPresentException           Traceback (most recent call last)
<ipython-input-52-543c0fff5a64> in <module>
     16 try:
---> 17    element = wait.until(EC.element_to_be_clickable((By.NAME, 'wlike_limit')))
     18 except UnexpectedAlertPresentException:

UnexpectedAlertPresentException: Alert Text: 
Message: unexpected alert open: {Alert text: }
  (Session info: chrome=84.0.4147.125)


During handling of the above exception, another exception occurred:

NoAlertPresentException                   Traceback (most recent call last)
<ipython-input-52-543c0fff5a64> in <module>
     17    element = wait.until(EC.element_to_be_clickable((By.NAME, 'wlike_limit')))
     18 except UnexpectedAlertPresentException:
---> 19    print("UnexpectedAlertPresentException, ",driver2.switch_to.alert.text)
     20 

Could anyone help me deal with this problem?

Answer 1

This error message...

NoAlertPresentException                   Traceback (most recent call last)

...implies that though you attempted to handle an Alert but there was no such alert.

---

Analysis

This line of code:

except UnexpectedAlertPresentException:
        print("UnexpectedAlertPresentException, ",driver2.switch_to.alert.text)
        

would switch to the alert and retrieve the text when your code block faces UnexpectedAlertPresentException. However it seems there was no alert present.

Now in in the try{} block:

element = wait.until(EC.element_to_be_clickable((By.NAME, 'wlike_limit')))

This line won't raise any alert as you are not interacting with the element. Hence, the catching UnexpectedAlertPresentException doesn't looks useful to me.

---

Conclusion

The try-catch{} block for handling UnexpectedAlertPresentException doesn't looks useful to me. Perhaps your previous code block can provide some hint in which circumstances you wanted to handle UnexpectedAlertPresentException.

---

References

You can find a couple of relevant discussions in:

• Python click button on alert
• Why switching to alert through selenium is not stable?

Answer 2

By my side, when I am attempting to handle UnexpectedAlertPresentException. Then I notice that Selenium closes automatically the alert pop-up. Thus in this case ,I just retry my script and it works!

    def some_function:
        try:
            return driver.find_element_by_css_selector(
                "#elementID"
            ).text
        except UnexpectedAlertPresentException:
            # In this case, no need to call driver.switch_to.alert.accept()
            # or driver.switch_to.alert.dismiss()
            time.sleep(5) # very important to wait for selenium to finish the action
            driver.find_element_by_css_selector(
                "#elementID"
            ).text