Not being able to catch an exception

debugcn Published at Dev

yayu

So I am trying to catch the Webdriver exception and don't want its traceback to pollute my logs. Here is the bit of code

from selenium.common.exceptions import TimeoutException, WebDriverException

try:
    WebDriverWait(driver, 10).until(
        EC.presence_of_element_located((By.CSS_SELECTOR, '.loading')))
except TimeoutException:
    log.msg("Seneium Timeout: {}".format(response.url))
except WebDriverException as e:
    log.msg("Selenium Exception: {0} Message: {1}".format("my message", str(e)))
finally:
    driver.quit()

yet I'm still getting these:

 <full traceback here>
 selenium.common.exceptions.WebDriverException: Message: Can not connect to GhostDriver

What am I doing wrong?

alecxe

The exception is raised outside of your try/except block while initializing a WebDriver instance:

driver = webdriver.PhantomJS()

FYI, this happens while starting PhantomJS with GhostDriver, quote from the source code:

def start(self):
    """
    Starts PhantomJS with GhostDriver.

    :Exceptions:
     - WebDriverException : Raised either when it can't start the service
       or when it can't connect to the service
    """
    try:
        self.process = subprocess.Popen(self.service_args, stdin=subprocess.PIPE,
                                        close_fds=platform.system() != 'Windows',
                                        stdout=self._log, stderr=self._log)

    except Exception as e:
        raise WebDriverException("Unable to start phantomjs with ghostdriver.", e)
    count = 0
    while not utils.is_connectable(self.port):
        count += 1
        time.sleep(1)
        if count == 30:
             raise WebDriverException("Can not connect to GhostDriver")

And, start() is called in WebDriver's constructor (__init__() method).

In other words, it starts a service, but cannot connect to it.

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