title: initial value in radio button django form
body: <p>how can I declare initial value of radio button?</p>
  
  <p>form.py</p>
  
  <pre><code>YESNO = (
      ('Yes','Yes'),
      ('No', 'No'),
  )
  class MyForm(forms.Form):
     like = forms.ChoiceField(widget=forms.RadioSelect, choices=YESNO)
  </code></pre>
  
  <p>myhtml.html</p>
  
  <pre><code>{{form.like}}
  </code></pre>
  
  <p>i try to put:</p>
  
  <pre><code>like = forms.ChoiceField(widget=forms.RadioSelect, choices=YESNO, initial={'Yes':'Yes'})
  </code></pre>
  
  <p>when i run my code, my radio button has not yet selected..</p>