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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def get_image_url(self, selector, by=By.CSS_SELECTOR, timeout=settings.SMALL_TIMEOUT):
 """ Extracts the URL from an image element on the page. """

        if self.timeout_multiplier and timeout == settings.SMALL_TIMEOUT:
            timeout = self.__get_new_timeout(timeout)
        return self.get_attribute(selector,
                                  attribute='src', by=by, timeout=timeout)