How to use the pyicloud.exceptions.PyiCloud2FARequiredError function in pyicloud

def keep_alive(self, now):
        """Keep the api alive."""
        from pyicloud.exceptions import PyiCloud2FARequiredError

        if self.api is None:
            self.reset_account_icloud()

        if self.api is None:
            return

        if self.api.requires_2fa:
            try:
                self.api.authenticate()
            except PyiCloud2FARequiredError:
                if self._trusted_device is None:
                    self.icloud_need_trusted_device()
                    return

                if self._verification_code is None:
                    self.icloud_need_verification_code()
                    return

                if self._verification_code == 'waiting':
                    return

                if self.api.validate_verification_code(
                        self._trusted_device, self._verification_code):
                    self._verification_code = None
        else:
            self.api.authenticate()

logger.debug(json)

        reason = json.get('errorMessage') or json.get('reason')
        if not reason and isinstance(json.get('error'), six.string_types):
            reason = json.get('error')
        if not reason and not response.ok:
            reason = response.reason
        if not reason and json.get('error'):
            reason = "Unknown reason"

        code = json.get('errorCode')

        if reason:
            if self.service.requires_2fa and \
                    reason == 'Missing X-APPLE-WEBAUTH-TOKEN cookie':
                raise PyiCloud2FARequiredError(response.url)

            api_error = PyiCloudAPIResponseError(reason, code)
            logger.error(api_error)
            raise api_error

        return response