title: auth with google calendar api v3
body: <p>from this guy's ask: <a href="https://stackoverflow.com/questions/10591849/unauthorized-interaction-with-google-calendar-api-v3">Unauthorized interaction with google calendar API v3</a></p>
  
  <p>I knew that, google calendar cann't work with service_account.</p>
  
  <p>the point is, I need to write a script/python which run in my server, and this script fetch my calendar data from google calendar</p>
  
  <p>but, how can i auth to google?  not web application, not installed_app, just a script</p>
  
  <p>Thanks.</p>