title: how to make the username and email is Unique .. using WTFroms
body: <p><a href="http://wtforms.simplecodes.com/" rel="nofollow noreferrer">wtforms</a> is a forms validation and rendering library for python web development</p>
  
  <p>but i can't find how to handle the username  and email Unique ,</p>
  
  <p>thanks</p>