title: pass a string variable into a gql query
body: <p>How in the world do I pass a string variable into GQL with python?? I can do it fine in SQL but it just isn't working.  here is what I have:  </p>
  
  <pre><code>personalposts = db.GqlQuery("select * from PersonalPost where user_id = %s order by created desc limit 30" % user_id)
  </code></pre>
  
  <p>This has been killing me but should be really simple I feel.</p>
  
  <p>Thanks!</p>