title: Empty ChoiceField selection in Django forms
body: <p>I have a dropdown form for one to select their graduation year -- </p>
  
  <pre><code>graduation = forms.ChoiceField(choices=[(x,str(x)) for x in graduation_range])
  </code></pre>
  
  <p>How would I add an additional field and make that the default selection/display? For example, something like "Select Year".</p>
  
  <p>Currently, I'm doing --</p>
  
  <pre><code>graduation_range = range(1970,2015)
  graduation_range.append('Select Year')
  </code></pre>
  
  <p>But it seems there must be a more straight-forward way to do this.
   Thank you.</p>