Django表格不会呈现

我的表格代码：

class PlanForm(forms.Form):
    a = forms.CharField(widget=forms.TextInput(attrs={"class", "add-up"}))
    b = forms.CharField(widget=forms.TextInput(attrs={"class", "add-up"}))

    class Media:
        javascript=('test.js', )

我的观点代码：

def plan_detail(request):
    if request.method == "POST":
        return render(request=request,
                  template_name='pasteur/plan_detail.html',
                      dictionary={ 'message': 'This was a post request. WTF!' })
    else:
        return render(request=request,
                  template_name='pasteur/plan_detail.html',
                      dictionary={ 'form': PlanForm() })

堆栈跟踪：

环境：请求方法：GET请求URL：Django版本：1.4 Python版本：2.7.2已安装的应用程序：（'django.contrib.auth'，'django.contrib.contenttypes'，'django.contrib.sessions'，'django .contrib.sites'，'django.contrib.messages'，'django.contrib.staticfiles'，'django.contrib.admin'，'django.contrib.admindocs'，'south'，'pasteur'）已安装的中间件:( 'django.middleware.common.CommonMiddleware'，'django.contrib.sessions.middleware.SessionMiddleware'，'django.middleware.csrf.CsrfViewMiddleware'，'django.contrib.auth.middleware.AuthenticationMiddleware'，'django.contrib.messages .middleware.MessageMiddleware'）模板错误：在模板/Users/judithjacques/dana/dev/pasteur/src/pasteur/templates/pasteur/plan_detail.html中，第8行'set'对象的错误没有属性'get'1：回溯：get_response 111中的文件“/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/django/core/handlers/base.py”.response = callback（request，* callback_args， 呼叫back_kwargs）文件“/Users/judithjacques/dana/dev/pasteur/src/pasteur/views.py”在plan_detail 13. dictionary = {'form'：form}）文件“/Library/Frameworks/Python.framework/Versions/渲染中的2.7 / lib / python2.7 / site-packages / django / shortcuts / init.py“返回HttpResponse（loader.render_to_string（ args，* kwargs），File”/Library/Frameworks/Python.framework/版本/ 2.7 / lib / python2.7 / site-packages / django / template / loader.py“在render_to_string 176. return t.render（context_instance）File”/Library/Frameworks/Python.framework/Versions/2.7/lib/ python2.7 / site-packages / django / template / base.py“在render 140中 . 返回self._render（context）文件”/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site- package / django / template / base.py“in _render 134. return self.nodelist.render（context）File”/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/django/ template / base.py“in render 823. bit = self.render_node（node，context）File”/Library/Frameworks/Python.framewo rk / Versions / 2.7 / lib / python2.7 / site-packages / django / template / debug.py“在render_node 74中 . 返回node.render（context）文件”/Library/Frameworks/Python.framework/Versions/2.7/在渲染281中的lib / python2.7 / site-packages / django / template / defaulttags.py“return nodelist.render（context）File”/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/ site-packages / django / template / base.py“in render 823. bit = self.render_node（node，context）File”/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages /django/template/debug.py“在render_node 74中 . 返回node.render（context）文件”/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/django/template/debug .py“in render 84. output = self.filter_expression.resolve（context）File”/ Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/django/template/base.py“在解析571. obj = self.var.resolve（context）文件“/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/s ite-packages / django / template / base.py“in resolve 721. value = self.resolve_lookup（context）File”/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/django /template/base.py“在_resolve_lookup 772. current = current（）文件”/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/django/forms/forms.py“in as_ul 229. errors_on_separate_row = False）文件“/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/django/forms/forms.py”在_html_output 171. label = bf.label_tag（标签）或''文件“/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/django/forms/forms.py”in label_tag 508. id = widget.attrs.get（ 'id'）或self.auto_id异常类型：/ pasteur / plan / create / Exception中的AttributeError值：'set'对象没有属性'get'