title: AttributeError: 'module' object has no attribute 'SubscriberClient'
body: <p>After running <code>sudo pip install google.cloud.pubsub</code>
  I am running the following python code in ubtunu google compute engine:</p>
  
  <p><code>import google.cloud.pubsub_v1</code></p>
  
  <p>I get the following error when importing this:</p>
  
  <blockquote>
    <p>ImportError: No module named pubsub_v1 attribute 'SubscriberClient'</p>
  </blockquote>
  
  <p>Can anyone tell me how to fix this?</p>