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

EN

views.py
from django.http import HttpResponse, HttpRequest, HttpResponseRedirect
from .models import *

def n01_size_kss(request):
    if request.method == 'POST':
        form = KSS_Form(request.POST)
        context = {'form':form}

        if form.is_valid():
            filtertype, context = n01_context_cleaned_data(form.cleaned_data)

            if filtertype != "none":
                list_to_prepopulate_the_form1 = prepare_dictionary_form2(context)
                form1 = KSS_Form1(initial={'list1'=list_to_prepopulate_the_form1})
                context = {'form':form1, **context}
            return render(request, 'af/size/01_kss_size2.html', context)
    else:
        context = {'form':KSS_Form()}
        return render(request, 'af/size/01_kss_size1.html', context)

forms.py
from django import forms
from django.conf.urls.i18n import i18n_patterns

class KSS_Form1(forms.Form):
    druckstufe = forms.ChoiceField(\
            required=True, \
            label=_("Specify desired presure stage:"), \
            initial="1", \
            disabled=False, \
            error_messages={'required':'Please specify desired pressure stage'}, \
            choices = list1,
            )