Let's say I'm using the Django Site model:

class Site(models.Model):
    name = models.CharField(max_length=50)

My Site values are (key, value):

1. Stackoverflow
2. Serverfault
3. Superuser

I want to construct a form with an html select widget with the above values:

<select>
    <option value="1">Stackoverflow</option>
    <option value="2">Serverfault</option>
    <option value="3">Superuser</option>
</select>

I'm thinking of starting with the following code but it's incomplete:

class SiteForm(forms.Form):
    site = forms.IntegerField(widget=forms.Select())

Any ideas how I can achieve that with Django form?