在Flask中显示输出时出现内部服务器错误500

-2

我刚开始学习Flask并引用一个教程来运行一小段测试代码。在Flask中显示输出时出现内部服务器错误500

下面是代码：

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保存在templates文件夹中。在运行Hello.py时，运行student.html并显示一个表单，我可以在该表单中输入值。点击提交按钮应显示result.html页面，而是，它提供了以下错误：

内部服务器错误服务器遇到一个内部错误，无法完成您的请求。服务器过载或应用程序出现错误。

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 -

你能告诉什么是错我的代码？

来源

2017-06-25 Kshitiz

不是没有回溯。在你删除的文章中，你包含了它，但是你有一个'TemplateNotFound'异常。你还有这种例外吗？然后通过将它移动到正确的位置来修复您的模板文件。 –

我意识到我犯这个错误是多么愚蠢。我移动了模板文件夹中的result.html和student.html，并且没有出现异常。相反，这。一个脚本工作，而另一个脚本不工作。 – Kshitiz

但是我们仍然需要看到回溯。 –

您将request.form对象传入您的模板。由于回溯告诉你，对象有没有iteritems()方法：

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

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

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

来源

2017-06-25 15:42:57

在Flask中显示输出时出现内部服务器错误500

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