René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"DISCUSSION: Does a Transaction need to be bound to a Connection and vice versa","articleBody":"It seems we could have `connection=None` as an optional / implicit argument in the `Transaction` methods `add_auto_id_entity()`, `begin()`, `commit()` and `rollback()`.\n\nOn `Connection`, the current transaction is used to alter the behavior of the methods, e.g. from [`commit()`](https://github.com/GoogleCloudPlatform/gcloud-python/blob/8faba35a266cd6280f125adf6035f902a07a26e4/gcloud/datastore/connection.py#L359-L363)\n\n``` python\n        if self.transaction():\n            request.mode = datastore_pb.CommitRequest.TRANSACTIONAL\n            request.transaction = self.transaction().id()\n        else:\n            request.mode = datastore_pb.CommitRequest.NON_TRANSACTIONAL\n```\n\nIt seems instead this separation would benefit by having `Transaction` subclass `Connection` and adding the \"extra\" transaction parts when needed.\n","author":{"url":"https://github.com/dhermes","@type":"Person","name":"dhermes"},"datePublished":"2015-01-07T03:21:20.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/495/google-cloud-python/issues/495"}