Question

我刚开始学习Flask并参考教程来运行一小段测试代码。

以下是代码：

Hello.py

from flask import Flask, render_template, request
app = Flask(__name__)

@app.route('/')
def student():
   return render_template('student.html')

@app.route('/result',methods = ['POST', 'GET'])
def result():
   if request.method == 'POST':
      result = request.form
      return render_template("result.html",result = result)

if __name__ == '__main__':
   app.run()

student.html

<html>
   <body>

      <form action = "http://localhost:5000/result" method = "POST">
         <p>Name <input type = "text" name = "Name" /></p>
         <p>Physics <input type = "text" name = "Physics" /></p>
         <p>Chemistry <input type = "text" name = "chemistry" /></p>
         <p>Maths <input type ="text" name = "Mathematics" /></p>
         <p><input type = "submit" value = "submit" /></p>
      </form>

   </body>
</html>

result.html

<!doctype html>
<html>
   <body>

      <table border = 1>
         {% for key, value in result.iteritems() %}

            <tr>
               <th> {{ key }} </th>
               <td> {{ value }} </td>
            </tr>

         {% endfor %}
      </table>

   </body>
</html>

我已将student.html和result.html保留在templates文件夹中。运行Hello.py后，student.html会运行并显示一个表单，我可以在其中输入字段中的值。单击“提交”应显示result.html页面，但它会出现以下错误：

内部服务器错误服务器遇到内部错误，无法完成您的请求。服务器过载或应用程序出错。

回溯：

* Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)
127.0.0.1 - - [25/Jun/2017 20:48:15] "GET / HTTP/1.1" 200 -
[2017-06-25 20:48:24,634] ERROR in app: Exception on /result [POST]
Traceback (most recent call last):
  File "C:\Users\Kshitiz\Anaconda3\lib\site-packages\flask\app.py", line 1982, in wsgi_app
    response = self.full_dispatch_request()
  File "C:\Users\Kshitiz\Anaconda3\lib\site-packages\flask\app.py", line 1614, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "C:\Users\Kshitiz\Anaconda3\lib\site-packages\flask\app.py", line 1517, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "C:\Users\Kshitiz\Anaconda3\lib\site-packages\flask\_compat.py", line 33, in reraise
    raise value
  File "C:\Users\Kshitiz\Anaconda3\lib\site-packages\flask\app.py", line 1612, in full_dispatch_request
    rv = self.dispatch_request()
  File "C:\Users\Kshitiz\Anaconda3\lib\site-packages\flask\app.py", line 1598, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "<ipython-input-1-0b3c292b941b>", line 12, in result
    return render_template("result.html",result = result)
  File "C:\Users\Kshitiz\Anaconda3\lib\site-packages\flask\templating.py", line 134, in render_template
    context, ctx.app)
  File "C:\Users\Kshitiz\Anaconda3\lib\site-packages\flask\templating.py", line 116, in _render
    rv = template.render(context)
  File "C:\Users\Kshitiz\Anaconda3\lib\site-packages\jinja2\asyncsupport.py", line 76, in render
    return original_render(self, *args, **kwargs)
  File "C:\Users\Kshitiz\Anaconda3\lib\site-packages\jinja2\environment.py", line 1008, in render
    return self.environment.handle_exception(exc_info, True)
  File "C:\Users\Kshitiz\Anaconda3\lib\site-packages\jinja2\environment.py", line 780, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "C:\Users\Kshitiz\Anaconda3\lib\site-packages\jinja2\_compat.py", line 37, in reraise
    raise value.with_traceback(tb)
  File "C:\Users\Kshitiz\Desktop\doc2vec\templates\result.html", line 6, in top-level template code
    {% for key, value in result.iteritems() %}
jinja2.exceptions.UndefinedError: 'werkzeug.datastructures.ImmutableMultiDict object' has no attribute 'iteritems'
127.0.0.1 - - [25/Jun/2017 20:48:24] "POST /result HTTP/1.1" 500 -

您能告诉我的代码有什么问题吗？

Answer 1

您将request.form对象传递给了模板。跟踪告诉您，该对象没有iteritems()方法：

'werkzeug.datastructures.ImmutableMultiDict object' has no attribute 'iteritems'

字典上的iteritems()方法是Python 2特有的;在Python 3中，只需使用items()：

{% for key, value in result.items() %}

在Flask中显示输出时获取内部服务器错误500

1 个答案: