title: Passing secret variables to Google Colaboratory notebook
body: <p>Is there a secure way for public (shared with someone) Google Colaboratory notebooks to import security sensitive variables like access tokens?</p>
  
  <p>I have a notebook with code like this one:</p>
  
  <pre><code>TOKEN='7o6kti1TW7ebwXXG6ZAdVkS08MzDBLG00oXTCNTYEbB5A'
  items = json.loads(
    requests.get('https://someservice.com/api/items?access_token={}'.format(TOKEN)).text
  )
  </code></pre>
  
  <p>I want share the notebook with other users so they are able to run and edit code cells, but I want to move TOKEN variable definition to some hidden place. Is there a way to achieve that?</p>