title: (Google App Engine) How can I keep my password long time for updating content?
body: <p>Now when I run this command:</p>
  
  <p>/usr/bin/python ~/google_appengine/appcfg.py update ~/cdn</p>
  
  <p>I should write email and password.
  And it is keeping some time, but after a day, I should write email and
  password again.</p>
  
  <p>How can I keep my auntification (email and password) for long time
  (month, year)?</p>