如何在Django中选择标签来形成ChoiceField？

from django import forms

class MyForm(forms.Form):
    CHOICES = (
        ('choice1', '选项1'),
        ('choice2', '选项2'),
        ('choice3', '选项3'),
    )
    my_choice_field = forms.ChoiceField(widget=forms.RadioSelect, choices=CHOICES)

from django.shortcuts import render
from .forms import MyForm

def my_view(request):
    form = MyForm()
    return render(request, 'my_template.html', {'form': form})

<form method="post">
  {% csrf_token %}
 <fieldset>
   <legend>选择一个选项</legend>
    {% for choice in form.my_choice_field %}
      {{ choice }}
    {% endfor %}
  </fieldset>
</form>