如何预填充Django (非模型)表单(如何将值列表从view.py传递到表单中的ChoiceField )？

from django import forms

class MyForm(forms.Form):
    my_choice = forms.ChoiceField(choices=[])

    def __init__(self, *args, **kwargs):
        choices = kwargs.pop('choices', None)
        super(MyForm, self).__init__(*args, **kwargs)
        if choices:
            self.fields['my_choice'].choices = choices

from django.shortcuts import render
from .forms import MyForm

def my_view(request):
    choices = [('value1', 'Label 1'), ('value2', 'Label 2'), ('value3', 'Label 3')]
    form = MyForm(choices=choices)
    return render(request, 'my_template.html', {'form': form})

<form method="post">
  {% csrf_token %}
  {{ form.as_p }}
  <button type="submit">Submit</button>
</form>