我有一个ChoiceField，现在如何在需要时获取“标签”？

class ContactForm(forms.Form):
     reason = forms.ChoiceField(choices=[("feature", "A feature"),
                                         ("order", "An order")],
                                widget=forms.RadioSelect)

form.cleaned_data["reason"] 只会给我“功能”或“命令”左右。