UnboundLocalError - 在赋值前引用局部变量 - Django

Question

这周你们帮了我很多忙，真是太棒了。希望你们能帮我解决这个问题。我试着查看网站上关于这种错误的其他帖子，但都没有真正帮到我。简单来说，我在一个页面上提交了一个表单，POST的数据又回到了生成这个表单的同一个视图。我想在发送完POST数据后跳转到另一个页面，但我遇到了这个错误。

def test(request):
    if request.method == 'POST':
        form = SubmitForm(request.POST) # A form bound to the POST data
        if form.is_valid():
            lat = form.cleaned_data['lat'] 
            lng = form.cleaned_data['lng']
            title = form.cleaned_data['title']
            story = form.cleaned_data['story']

            ctxt = {
                    'lat':lat,
                    'lng':lng,
                    'title':title,
                    'story':story,
                    }

            return render_to_response('home.html', ctxt, context_instance=RequestContext(request)) 

    else:

        import datetime
        now = datetime.datetime.now()
        form = SubmitForm()
        latest_marks = Marker.objects.all().order_by('-submitted')[0:10]

        ctxt = {
                'marks':latest_marks,
                'now':now.date(),
                'form': form,
                }
    return render_to_response('test.html', ctxt, context_instance=RequestContext(request))

我遇到的错误是

local variable 'ctxt' referenced before assignment

而错误追踪信息是

Environment:


Request Method: POST
Request URL: http://localhost:8000/test/

Django Version: 1.3
Python Version: 2.6.5
Installed Applications:
['django.contrib.staticfiles',
 'django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.sites',
 'django.contrib.admin',
 'userena',
 'guardian',
 'easy_thumbnails',
 'south',
 'database',
 'accounts',
 'socialregistration']
Installed Middleware:
('django.middleware.common.CommonMiddleware',
 'django.contrib.sessions.middleware.SessionMiddleware',
 'django.contrib.auth.middleware.AuthenticationMiddleware',
 'django.middleware.csrf.CsrfViewMiddleware',
 'userena.middleware.UserenaLocaleMiddleware',
 'socialregistration.middleware.FacebookMiddleware')


Traceback:
File "/home/wluw/dev/chicagomap/lib/python2.6/site-packages/Django-1.3-py2.6.egg/django/core/handlers/base.py" in get_response
  111.                         response = callback(request, *callback_args, **callback_kwargs)
File "/home/wluw/dev/chicagomap/chicagomap/../chicagomap/database/views.py" in test
  58.     return render_to_response('test.html', ctxt, context_instance=RequestContext(request)) 

Exception Type: UnboundLocalError at /test/
Exception Value: local variable 'ctxt' referenced before assignment

任何帮助都会非常感激。谢谢。

django 表单处理错误调试 POST请求 unboundlocalerror 视图跳转

UnboundLocalError - 在赋值前引用局部变量 - Django

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