I see both used in different documentation from Google:
from google.cloud import pubsub
Is found in:
Whereas
from google.cloud import pubsub_v1
Is find in:
The google.cloud.pubsub library is designed to be make it easy to get the best performance out of a Cloud Pub/Sub publisher and subscriber. It has more advanced features such as message batching, asynchronous message delivery, and automatic ack deadline extension for messages not yet acknowledged by a subscriber. The API is different from the underlying Cloud Pub/Sub service API. For example, this library does not expose the pull
method directly; messages are instead delivered to a callback passed into the subscriber 's open
method.
The google.cloud.pubsub_v1 library exposes the underlying API directly. It can be useful in specific cases where this level of control is necessary, eg, when a synchronous subscriber is required in order to make requests in response to synchronous actions from a downstream dependency.
When possible, it is best to use the google.cloud.pubsub library.
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