很不错的技巧，原文在这里：http://djangosnippets.org/snippets/26/

from django import newforms as forms
from models import Language

# I put this on all required fields, because it's easier to pick up
# on them with CSS or JavaScript if they have a class of "required"
# in the HTML. Your mileage may vary.
attrs_dict = { 'class': 'required' }

class AddSnippetForm(forms.Form):
    """
    Form used for adding Snippets.
    
    """
    def __init__(self, *args, **kwargs):
        super(AddSnippetForm, self).__init__(*args, **kwargs)
        self.fields['language'].choices = [('', '----------')] + [(lang.id, lang.name) for lang in Language.objects.all()]
    
    title = forms.CharField(max_length=250, widget=forms.TextInput(attrs=attrs_dict))
    description = forms.CharField(widget=forms.Textarea(attrs=attrs_dict))
    code = forms.CharField(widget=forms.Textarea(attrs=attrs_dict))
    tag_list = forms.CharField(max_length=250, widget=forms.TextInput(attrs=attrs_dict))
    language = forms.ChoiceField(choices=(), widget=forms.Select(attrs=attrs_dict))