René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Make publish futures compatible with `concurrent.futures.as_completed()`","articleBody":"#### Environment details\r\n\r\n  - OS type and version: Linux\r\n  - Python version: `Python 3.7.7`\r\n  - pip version: `pip 21.0.1`\r\n  - `google-cloud-pubsub` version: \r\n```Name: google-cloud-pubsub\r\nVersion: 2.3.0\r\nSummary: Google Cloud Pub/Sub API client library\r\nHome-page: https://github.com/googleapis/python-pubsub\r\nAuthor: Google LLC\r\nAuthor-email: googleapis-packages@google.com\r\nLicense: Apache 2.0\r\nLocation: /Users/mike/.pyenv/versions/3.8.6/envs/detection-processor/lib/python3.8/site-packages\r\nRequires: grpc-google-iam-v1, proto-plus, google-api-core, libcst\r\nRequired-by: \r\n```\r\n\r\n#### Steps to reproduce\r\n\r\n  1. Create multiple publish futures with `publisher.publish()`\r\n  2. Use `in concurrent.futures.as_completed()` as a generator to trigger on completion.\r\n\r\n#### Code example\r\n\r\n```python\r\nfuture_list = []\r\n\r\nfor msg in messages:\r\n    future_list.append(publisher.publish(topic_path, msg))\r\n\r\nfor _ in concurrent.futures.as_completed(\r\n    fs=future_list,\r\n):\r\n    # Do something\r\n    continue\r\n```\r\n\r\n#### Stack trace\r\n```\r\n'Future' object has no attribute '_condition'\r\n```\r\n\r\nI understand that the publish future is not REALLY a concurrent future object. This attribute error does not happen with all messages, it's a minority of messages. I'm not sure what causes some publish futures to work with `as_completed` and some do not.\r\n","author":{"url":"https://github.com/mbrancato","@type":"Person","name":"mbrancato"},"datePublished":"2021-04-06T13:40:41.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":7},"url":"https://github.com/368/python-pubsub/issues/368"}