René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"regression/clear_datastore no longer works","articleBody":"As of b343acf4ade6dfc659f71a981eb51b62d22e33a0 running\n\n```\n$ python regression/clear_datastore.py\n```\n\nfails because the backend returns\n\n```\nException: Request failed. Error was: queries inside transactions must have ancestors\n```\n\nTo see an example query, [insert](https://github.com/GoogleCloudPlatform/gcloud-python/blob/b343acf4ade6dfc659f71a981eb51b62d22e33a0/regression/clear_datastore.py#L41) the following:\n\n``` python\n\u003e\u003e\u003e print query._pb\nprojection {\n  property {\n    name: \"__key__\"\n  }\n}\nkind {\n  name: \"Character\"\n}\nlimit: 20\n```\n\nI'm fairly certain the backend has changed, but I'm not 100% sure.\n\nEither way, this isn't super pressing right now since there are lot's of ways to delete entities that were accidentally created.\n","author":{"url":"https://github.com/dhermes","@type":"Person","name":"dhermes"},"datePublished":"2014-12-21T04:13:07.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/453/google-cloud-python/issues/453"}