Python 导入错误（无法导入姓名联系人表单）

我正在尝试构建一个e_commerc django应用程序，但我遇到了一个错误，它有点令人困惑。 我的错误是：

Environment:


Request Method: GET
Request URL: http://127.0.0.1:8000/

Django Version: 1.7.4
Python Version: 2.7.6
Installed Applications:
('django.contrib.admin',
 'django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.messages',
 'django.contrib.staticfiles',
 'profiles')
Installed Middleware:
('django.contrib.sessions.middleware.SessionMiddleware',
 'django.middleware.common.CommonMiddleware',
 'django.middleware.csrf.CsrfViewMiddleware',
 'django.contrib.auth.middleware.AuthenticationMiddleware',
 'django.contrib.auth.middleware.SessionAuthenticationMiddleware',
 'django.contrib.messages.middleware.MessageMiddleware',
 'django.middleware.clickjacking.XFrameOptionsMiddleware')


Template error:
In template /home/petarp/Documents/Udemy/Learn_Django/static/templates/navbar.html, error at line 15
   cannot import name contactForm
   5 :           <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar" aria-expanded="false" aria-controls="navbar"> 
   6 :             <span class="sr-only">Toggle navigation</span> 
   7 :             <span class="icon-bar"></span> 
   8 :             <span class="icon-bar"></span> 
   9 :             <span class="icon-bar"></span> 
   10 :           </button> 
   11 :           <a class="navbar-brand" href="#">Bootstrap theme</a> 
   12 :         </div> 
   13 :         <div id="navbar" class="navbar-collapse collapse"> 
   14 :           <ul class="nav navbar-nav"> 
   15 :             {% url 'home' as home %}  
   16 :            {% url 'about' as about %}


   17 :            {% url 'contact' as contact %} 
   18 :             <li {% if request.path == home %} class="active" {%endif%}><a href="{% url 'home' %}">Home</a></li> 
   19 :             <li {% if request.path == about %} class="active" {%endif%}><a href="{% url 'about' %}">About</a></li> 
   20 :             <li {% if request.path == contact %} class="active" {%endif%}><a href="{% url 'contact' %}">Contact</a></li> 
   21 :             <li class="dropdown"> 
   22 :               <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-expanded="false">Dropdown <span class="caret"></span></a> 
   23 :               <ul class="dropdown-menu" role="menu"> 
   24 :                 <li><a href="#">Action</a></li> 
   25 :                 <li><a href="#">Another action</a></li> 
Traceback:
File "/home/petarp/.virtualenvs/e_udemy/local/lib/python2.7/site-packages/django/core/handlers/base.py" in get_response
  111.                     response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/home/petarp/Documents/Udemy/Learn_Django/source/profiles/views.py" in home
  7.     return render(request, tempalte, context)
File "/home/petarp/.virtualenvs/e_udemy/local/lib/python2.7/site-packages/django/shortcuts.py" in render
  50.     return HttpResponse(loader.render_to_string(*args, **kwargs),
File "/home/petarp/.virtualenvs/e_udemy/local/lib/python2.7/site-packages/django/template/loader.py" in render_to_string
  178.         return t.render(context_instance)
File "/home/petarp/.virtualenvs/e_udemy/local/lib/python2.7/site-packages/django/template/base.py" in render
  148.             return self._render(context)
File "/home/petarp/.virtualenvs/e_udemy/local/lib/python2.7/site-packages/django/template/base.py" in _render
  142.         return self.nodelist.render(context)
File "/home/petarp/.virtualenvs/e_udemy/local/lib/python2.7/site-packages/django/template/base.py" in render
  844.                 bit = self.render_node(node, context)
File "/home/petarp/.virtualenvs/e_udemy/local/lib/python2.7/site-packages/django/template/debug.py" in render_node
  80.             return node.render(context)
File "/home/petarp/.virtualenvs/e_udemy/local/lib/python2.7/site-packages/django/template/loader_tags.py" in render
  126.         return compiled_parent._render(context)
File "/home/petarp/.virtualenvs/e_udemy/local/lib/python2.7/site-packages/django/template/base.py" in _render
  142.         return self.nodelist.render(context)
File "/home/petarp/.virtualenvs/e_udemy/local/lib/python2.7/site-packages/django/template/base.py" in render
  844.                 bit = self.render_node(node, context)
File "/home/petarp/.virtualenvs/e_udemy/local/lib/python2.7/site-packages/django/template/debug.py" in render_node
  80.             return node.render(context)
File "/home/petarp/.virtualenvs/e_udemy/local/lib/python2.7/site-packages/django/template/loader_tags.py" in render
  150.                 return template.render(context)
File "/home/petarp/.virtualenvs/e_udemy/local/lib/python2.7/site-packages/django/template/base.py" in render
  148.             return self._render(context)
File "/home/petarp/.virtualenvs/e_udemy/local/lib/python2.7/site-packages/django/template/base.py" in _render
  142.         return self.nodelist.render(context)
File "/home/petarp/.virtualenvs/e_udemy/local/lib/python2.7/site-packages/django/template/base.py" in render
  844.                 bit = self.render_node(node, context)
File "/home/petarp/.virtualenvs/e_udemy/local/lib/python2.7/site-packages/django/template/debug.py" in render_node
  80.             return node.render(context)
File "/home/petarp/.virtualenvs/e_udemy/local/lib/python2.7/site-packages/django/template/defaulttags.py" in render
  444.             url = reverse(view_name, args=args, kwargs=kwargs, current_app=context.current_app)
File "/home/petarp/.virtualenvs/e_udemy/local/lib/python2.7/site-packages/django/core/urlresolvers.py" in reverse
  551.     return iri_to_uri(resolver._reverse_with_prefix(view, prefix, *args, **kwargs))
File "/home/petarp/.virtualenvs/e_udemy/local/lib/python2.7/site-packages/django/core/urlresolvers.py" in _reverse_with_prefix
  415.             self._populate()
File "/home/petarp/.virtualenvs/e_udemy/local/lib/python2.7/site-packages/django/core/urlresolvers.py" in _populate
  303.                 lookups.appendlist(pattern.callback, (bits, p_pattern, pattern.default_args))
File "/home/petarp/.virtualenvs/e_udemy/local/lib/python2.7/site-packages/django/core/urlresolvers.py" in callback
  231.         self._callback = get_callable(self._callback_str)
File "/home/petarp/.virtualenvs/e_udemy/local/lib/python2.7/site-packages/django/utils/lru_cache.py" in wrapper
  101.                     result = user_function(*args, **kwds)
File "/home/petarp/.virtualenvs/e_udemy/local/lib/python2.7/site-packages/django/core/urlresolvers.py" in get_callable
  97.             mod = import_module(mod_name)
File "/usr/lib/python2.7/importlib/__init__.py" in import_module
  37.     __import__(name)
File "/home/petarp/Documents/Udemy/Learn_Django/source/contact/views.py" in <module>
  3. from .forms import contactForm

Exception Type: ImportError at /
Exception Value: cannot import name contactForm

环境：
请求方法：获取
请求URL:http://127.0.0.1:8000/
Django版本：1.7.4
Python版本：2.7.6
已安装的应用程序：
（“django.contrib.admin”，
“django.contrib.auth”，
“django.contrib.contenttypes”，
“django.contrib.sessions”，
“django.contrib.messages”，
“django.contrib.staticfiles”，
"简介")
已安装的中间件：
（'django.contrib.sessions.middleware.SessionMiddleware'，
'django.middleware.common.CommonMiddleware'，
“django.middleware.csrf.CsrfViewMiddleware”，
'django.contrib.auth.middleware.AuthenticationMiddleware'，
'django.contrib.auth.middleware.SessionAuthenticationMiddleware'，
'django.contrib.messages.middleware.MessageMiddleware'，
'django.middleware.clickjacking.xframeoptions中间件'）
模板错误：
在template/home/petarp/Documents/Udemy/Learn_Django/static/templates/navbar.html中，第15行出现错误
无法导入姓名联系人表单
5 :            
6：切换导航
7 :              
8 :              
9 :              
10 :            
11 :            
12 :          
13 :          
14:

15:{%url'home'作为home%}
16:{%url'about'与about%}
17:{%url'联系人'作为联系人%}
18:
19:
20:
21:

22 :                
23:

24:

25:

回溯：
get_响应中的文件“/home/petarp/.virtualenvs/e_udemy/local/lib/python2.7/site packages/django/core/handlers/base.py”
111响应=包装的回调（请求，*回调参数，**回调参数）
主页中的文件“/home/petarp/Documents/Udemy/Learn\u Django/source/profiles/views.py”
7.返回渲染（请求、临时、上下文）
render中的文件“/home/petarp/.virtualenvs/e_udemy/local/lib/python2.7/site packages/django/shortcuts.py”
50返回HttpResponse（loader.render_to_string（*args，**kwargs），
render_to_字符串中的文件“/home/petarp/.virtualenvs/e_udemy/local/lib/python2.7/site packages/django/template/loader.py”
178.返回t.render（上下文_实例）
render中的文件“/home/petarp/.virtualenvs/e_udemy/local/lib/python2.7/site packages/django/template/base.py”
148.返回自我。\u呈现（上下文）
文件“/home/petarp/.virtualenvs/e_udemy/local/lib/python2.7/site packages/django/template/base.py”
142.返回self.nodelist.render（上下文）
render中的文件“/home/petarp/.virtualenvs/e_udemy/local/lib/python2.7/site packages/django/template/base.py”
844.bit=self.render_节点（节点，上下文）
render_节点中的文件“/home/petarp/.virtualenvs/e_udemy/local/lib/python2.7/site packages/django/template/debug.py”
80.返回节点.render（上下文）
render中的文件“/home/petarp/.virtualenvs/e_udemy/local/lib/python2.7/site packages/django/template/loader_tags.py”
126.返回编译的\u父对象。\u呈现（上下文）
文件“/home/petarp/.virtualenvs/e_udemy/local/lib/python2.7/site packages/django/template/base.py”
142.返回self.nodelist.render（上下文）
render中的文件“/home/petarp/.virtualenvs/e_udemy/local/lib/python2.7/site packages/django/template/base.py”
844.bit=self.render_节点（节点，上下文）
render_节点中的文件“/home/petarp/.virtualenvs/e_udemy/local/lib/python2.7/site packages/django/template/debug.py”
80.返回节点.render（上下文）
render中的文件“/home/petarp/.virtualenvs/e_udemy/local/lib/python2.7/site packages/django/template/loader_tags.py”
150.返回模板.呈现（上下文）
render中的文件“/home/petarp/.virtualenvs/e_udemy/local/lib/python2.7/site packages/django/template/base.py”
148.返回自我。\u呈现（上下文）
文件“/home/petarp/.virtualenvs/e_udemy/local/lib/python2.7/site packages/django/template/base.py”
142.返回self.nodelist.render（上下文）
render中的文件“/home/petarp/.virtualenvs/e_udemy/local/lib/python2.7/site packages/django/template/base.py”
844.bit=self.render_节点（节点，上下文）
render_节点中的文件“/home/petarp/.virtualenvs/e_udemy/local/lib/python2.7/site packages/django/template/debug.py”
80.返回节点.render（上下文）
render中的文件“/home/petarp/.virtualenvs/e_udemy/local/lib/python2.7/site packages/django/template/defaulttags.py”
url=reverse（查看\名称，args=args，kwargs=kwargs，当前\应用程序=上下文。当前\应用程序）
文件“/home/petarp/.virtualenvs/e_udemy/local/lib/python2.7/site packages/django/core/urlresolvers.py”的格式相反
551.将iri_返回到_uri（解析器._反向_，带有_前缀（视图，前缀，*args，**kwargs））
文件“/home/petarp/.virtualenvs/e_udemy/local/lib/python2.7/site packages/django/core/urlresolvers.py”位于带前缀的反向文件中
415.自我
文件“/home/petarp/.virtualenvs/e_udemy/local/lib/python2.7/site packages/django/core/urlresolvers.py”位于
303.lookups.appendlist（pattern.callback，（bits，p_pattern，pattern.default_args））
回调中的文件“/home/petarp/.virtualenvs/e_udemy/local/lib/python2.7/site packages/django/core/urlresolvers.py”
231.self.\u callback=get\u callable（self.\u callback\u str）
包装器中的文件“/home/petarp/.virtualenvs/e_udemy/local/lib/python2.7/site packages/django/utils/lru_cache.py”
101.结果=用户函数（*args，**kwds）
文件“/home/petarp/.virtualenvs/e_udemy/local/lib/python2.7/site-packages/django/co
def contact(request):
    form = contactForm(request.POST or None)
    if form.is_valid():
        print request.POST
        #remember save your form. 
    context = {'contactForm':form}
    template = 'contact.html'
    return render(request, template, context)

{% extends "base.html" %}

{% block content %}
<h1>Contact</h1>
<form method="POST" action="" > {% csrf_token %}
    {{ contactForm.as_p }}
<input type="submit" value="submit form" class="btn btn-default" />
</form>
{% endblock %}

class contactForm(forms.Form):