带有django格式预填充数据的只读字段

# models.py
class Test(models.Model):
    username = models.CharField(max_length=100)
    email = models.EmailField()


# forms.py
class TestForm(forms.ModelForm):
    username = forms.CharField()
    email = forms.EmailField()

    class Meta:
        model = Test
        fields = ('username', 'email')


# views.py
def test(request):
    email = "example@example.com"
    """
    How to pass and show the 'email' in django form/template?
    """
    if request.method == 'POST':
        form = TestForm(request.POST)
        if form.is_valid():
            form.save()
            return redirect('home')
    else:
        form = TestForm()
    return render(request, 'test.html', {"form": form})

我怎么能 价值 email 变量(即, example@example.com )以Django格式/模板作为 read-only field ?