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day12-封装等待方法

    def find_element(self, locator):
        try:
            element = WebDriverWait(self.driver, 30, 0.5).until(
                lambda x: x.find_element(*locator)
            )
            return element
        except NoSuchElementException as e:
            print(f'Error: {e}')
    def until(self, method, message=''):
        """Calls the method provided with the driver as an argument until the \
        return value is not False."""
        screen = None
        stacktrace = None

        end_time = time.time() + self._timeout
        while True:
            try:
                value = method(self._driver)
                if value:
                    return value
            except self._ignored_exceptions as exc:
                screen = getattr(exc, 'screen', None)
                stacktrace = getattr(exc, 'stacktrace', None)
            time.sleep(self._poll)
            if time.time() > end_time:
                break
        raise TimeoutException(message, screen, stacktrace)
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