title: Update one property of an entity in google cloud datastore python
body: <p>How do I update only one property of an entity in the google cloud datastore, without remove all other properties?</p>
  
  <pre><code>key = client.key('employee', ID)
  employee_to_deactivate = datastore.Entity(key)
  employee_to_deactivate.update({
      'active':False,
  })
  </code></pre>
  
  <p>this updates the active property to False, but removes all the other properties.</p>