title: How to set initial values in django forms.ChoiceField?
body: <p>I have simple django form:</p>
  
  <pre><code>class AddSymbolForm(forms.Form):
      list_n = forms.ChoiceField(choices=[(1,1), (2,2), (3,3)]) 
  </code></pre>
  
  <p>How can I set initial value in views.py? </p>
  
  <p>I tried to something like this:</p>
  
  <pre><code>add_symbol_form = AddSymbolForm(initial={list_n:3})
  </code></pre>
  
  <p>And this is not working. So is there any way I can set initial values for choice fields? </p>
  
  <p>P.S. It's interesing but this code set correct initial value</p>
  
  <pre><code>class AddSymbolForm(forms.Form):
      list_n = forms.ChoiceField(choices=[(1,1), (2,2), (3,3)], initial=3)
  </code></pre>
  
  <p>and this one is not working correctly:</p>
  
  <pre><code>class AddSymbolForm(forms.Form):
      list_n = forms.ChoiceField(choices=[(1,1), (2,2), (3,3)])
      list_n.initial = 3
  </code></pre>