title: How to make radio field show default value with flask and wtforms
body: <p>I am using radio field, and I would like the default value to be rendered as (.) instead of ( ) . I tried straightforward approach:</p>
  
  <pre><code>choice_switcher = RadioField('Choice?', [validators.Required()], choices=[('choice1', 'Choice One'),('choice2', 'Choice Two')], default='choice1')
  </code></pre>
  
  <p>It didn't work. It renders two choices as:</p>
  
  <pre><code>( ) Choice One
  ( ) Choice Two
  </code></pre>
  
  <p>Whereas I'd like to see this:</p>
  
  <pre><code>(.) Choice one
  ( ) Choice Two
  </code></pre>