如何显示Django'__全部&'；模板中的表单错误？

我有以下表格代码：

# forms.py
class SomeForm(forms.Form):
    hello = forms.CharField(max_length=40)
    world = forms.CharField(max_length=40)

    def clean(self):
        raise forms.ValidationError('Something went wrong')

# views.py
def some_view(request):
    if request.method == 'POST':
        form = SomeForm(request.POST)
        if form.is_valid():
            pass
    else:
        form = SomeForm()

    data = {
        'form': form
    }
    return render_to_response(
        'someform.html',
        data,
        context_instance=RequestContext(request)
    )

# someform.html
{{ form.hello }}
{{ form.hello.errors }}

{{ form.world }}
{{ form.world.errors }}

如何在模板级别显示键

\uuuuu all\uuuu

中的错误，而不必在视图中单独提取？我希望避免以下情况：

    if form.errors.has_key('__all__'):
        print form.errors['__all__']

---

{{form.non_field_errors}}

查找与form not field相关的错误

{{form.password.errors}

查找与文本字段（如本例中的passoword）相关的错误

{{ form.non_field_errors }}