title: Setting the selected value on a Django forms.ChoiceField
body: <p>Here is the field declaration in a form: </p>
  
  <pre><code>max_number = forms.ChoiceField(widget = forms.Select(), 
      choices = ([('1','1'), ('2','2'),('3','3'), ]), initial='3', required = True,)
  </code></pre>
  
  <p>I would like to set the initial value to be <code>3</code> and this doesn't seem to work. I have played about with the param, quotes/no quotes, etc... but no change.</p>
  
  <p>Could anyone give me a definitive answer if it is possible? And/or the necessary tweak in my code snippet?</p>
  
  <p><em>I am using Django 1.0</em></p>