显示一条记录到页面
后台逻辑：
html页面：
两种判断方法：
可以根据前几个字符判断：
url配置技巧：
C:\Users\hlg\PycharmProjects\djangostart\djangostart\urls.py
报错：
TypeError at /form_go/
argument to reversed() must be a sequence
Request Method: GET
Request URL: http://127.0.0.1:8000/form_go/
Django Version: 1.9.8
Exception Type: TypeError
Exception Value:
argument to reversed() must be a sequence
Exception Location: C:\Users\hlg\Envs\testvir2\lib\site-packages\django\core\urlresolvers.py in _populate, line 293
Python Executable: C:\Users\hlg\Envs\testvir2\Scripts\python.exe
Python Version: 2.7.12
Python Path:
['C:\\Users\\hlg\\PycharmProjects\\djangostart',
'C:\\Users\\hlg\\PycharmProjects\\djangostart',
'C:\\Windows\\system32\\python27.zip',
'C:\\Users\\hlg\\Envs\\testvir2\\DLLs',
'C:\\Users\\hlg\\Envs\\testvir2\\lib',
'C:\\Users\\hlg\\Envs\\testvir2\\lib\\plat-win',
'C:\\Users\\hlg\\Envs\\testvir2\\lib\\lib-tk',
'C:\\Users\\hlg\\Envs\\testvir2\\Scripts',
'c:\\python27\\Lib',
'c:\\python27\\DLLs',
'c:\\python27\\Lib\\lib-tk',
'C:\\Users\\hlg\\Envs\\testvir2',
'C:\\Users\\hlg\\Envs\\testvir2\\lib\\site-packages']
Server time: Thu, 24 May 2018 15:44:37 +0800
Error during template rendering
In template C:\Users\hlg\PycharmProjects\djangostart\templates\message_form.html, error at line 101
argument to reversed() must be a sequence
91 margin-top: 10px;
92 }
93 .success-msg{
94 color: #80A24A;
95 margin-top: 10px;
96 margin-bottom: 10px;
97 }
98 </style>
99 </head>
100 <body>
101 <form action="{% url 'go_form' %}" method="post" class="smart-green">
102 <h1>留言信息
103 <span>请留下你的信息.</span>
104 </h1>
105 <label>
106 <span>姓名 :</span>
107 <input id="name" type="text" value="{% ifequal my_message.name|slice:'1' '东' %}东方有明珠2{% endifequal %}" name="name" class="error" placeholder="请输入您的姓名"/>
108 <div class="error-msg"></div>
109 </label>
110
111 <label>
解决办法：
