def url(self, name):
        try:
            info = self._get_info(name)
            if not info:
                raise BlobKeyRequiredError(name % 'No blob info found for %s.')
            return get_serving_url(info.key())
        except (NotImageError, TransformationError):
            return None
        except BlobKeyRequiredError:
            if settings.DEBUG:
                return urlparse.urljoin(settings.MEDIA_URL, filepath_to_uri(name))
            else:
                raise
dataset/ETHPy150Open django-nonrel/djangoappengine/djangoappengine/storage.py/AppEngineStorage.url/swapped operands of `%`