flask-RESTful：解析一个错误类型的参数时为什么会得到一个AssertionError？ [英] flask-RESTful : why do I get an AssertionError when parsing an argument with the wrong type?

查看：1842 发布时间：2017/12/12 21:51:00 python flask flask-restful

本文介绍了flask-RESTful：解析一个错误类型的参数时为什么会得到一个AssertionError？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我第一次使用flask-RESTful。在文档中说：

使用reqparse模块还可以免费提供完整的错误消息。如果一个参数未能通过验证，Flask-RESTful会响应一个400错误请求和一个突出显示错误的响应。

我的情况，我得到一个异常AssertionError而不是。

这是代码：

 ＃！ / usr / bin / python 
＃ -  *  - 编码：UTF-8  -  *  -  
 
从flask导入Flask 
 from flask.ext.restful import Api，Resource，reqparse 
 
 $ b class Test（Resource）：
 @staticmethod 
 def put（id）：
 parser = reqparse.RequestParser（）
解析器.add_argument（'arg1'）
 parser.add_argument（'arg2'，type = int，help ='helptext'）
 args = parser.parse_args（）
返回参数，200 
 $ b $ app = Flask（__ name__）
 api = Api（app）
 
 api.add_resource（Test，'/v1.0/test/<int:id> '，endpoint ='test'）
 
 if __name__ =='__main__'：
 app.run（host ='0.0.0.0'，port = 5001，debug = True）

当我使用正确的值进行测试时，它可以工作：

  $ curl -i -HAccept：application / json-X PUT --dataarg1 = ABC& arg2 = 1http://192.0.0.7:5001/ v1.0 / test / 1 
 HTTP / 1.0 200 OK 
 Content-Type：application / json 
 Content-Len gth：38 
服务器：Werkzeug / 0.8.3 Python / 2.6.6 
日期：2016年4月15日星期五11:59:48 GMT 
 
 {
 arg1：ABC，
arg2：1 
}

然而，如果我把一个错误的值arg2，而不是得到一个错误消息的状态代码400，我得到一个异常：

  curl -i -HAccept：application / json-X PUT --dataarg1 = ABC& arg2 = Ahttp://192.0.0.7:5001/v1.0/test/1 
 HTTP / 1.0 500内部服务器错误
 Content-Type：text / html; charset = utf-8 
连接：关闭
服务器：Werkzeug / 0.8.3 Python / 2.6.6 
日期：2016年4月15日星期五12:04:25 GMT 
 
<！DOCTYPE HTML PUBLIC -  // W3C // DTD HTML 4.01 Transitional // EN
http://www.w3.org/TR/html4/loose.dtd\"> 
< html> 
< head> 
< title> AssertionError // Werkzeug Debugger< / title> 
< link rel =stylesheethref =？__ debugger __ = yes& amp; amp; amp; amp; amp; amp; amp; amp; amp; amp; amp; amp; amp; amp; amp; amp; amp; amp; amp; amp; amp; amp; amp; amp; amp; amp; amp; amp; amp; amp; amp; amp; 
< script type =text / javascriptsrc =？__ debugger __ = yes& amp; amp; amp; amp; amp; amp; amp; amp; amp; amp; amp; amp; amp; amp; amp; amp; amp; amp; amp; amp; amp; 
< script type =text / javascriptsrc =？__ debugger __ = yes& amp; amp; cmd = resource& amp; amp; amp; amp; amp; amp; amp; amp; amp; amp; amp; amp; amp; amp; amp; amp; amp; amp; amp; amp; amp; amp; amp; amp; amp; amp; amp; 
< script type =text / javascript> 
 var TRACEBACK = 27516816，
 CONSOLE_MODE = false，
 EVALEX = true，
 SECRET =uovVRKyVTy1b8gi5Yc3t; 
< / script> 
< / head> 
< body> 
< div class =debugger> 
< h1> AssertionError< / h1> 
< div class =detail> 
< p class =errormsg> AssertionError< / p> 
< / div> 
< h2 class =traceback> Traceback< em>（最近最后一次致电）< / em>< / h2> 
< div class =traceback> 
 
< ul>< li>< div class =frameid =frame-27516688> 
 文件< cite class =filename>/ usr / lib / python2.6 / site-packages / flask / app.py< / cite> ;, 
 line < em class =line> 1701< / em> ;, 
在< code class =function> __ call __< / code>< / h4> 
< pre>返回self.wsgi_app（environ，start_response）< / pre> 
< / div> 
 
< li>< div class =frameid =frame-139714215145552> 
 
文件< cite class =filename>/ usr / lib / python2.6 / site-packages / flask / app.py< / cite> ;, 
 line < em class =line> 1689< / em> ;, 
位于< code class =function> wsgi_app< / code>< / h4> 
< pre> response = self.make_response（self.handle_exception（e））< / pre> 
< / div> 
 
< li>< div class =frameid =frame-139714215148944> 
< h4>文件< cite class =filename>/ usr / lib / python2.6 / site-packages / flask_restful / __init__.py< / cite> ;, 
 line < em class =line> 271< / em> ;, 
在< code class =function> error_router< / code>< / h4> 
< pre> return original_handler（e）< / pre> 
< / div> 
 
< li>< div class =frameid =frame-139714215149072> 
< h4>文件< cite class =filename>/ usr / lib / python2.6 / site-packages / flask_restful / __init__.py< / cite> ;, 
 line < em class =line> 268< / em> ;, 
在< code class =function> error_router< / code>< / h4> 
< pre>返回self.handle_error（e）< / pre> 
< / div> 
 
< li>< div class =frameid =frame-139714215149136> 
 
文件< cite class =filename>/ usr / lib / python2.6 / site-packages / flask / app.py< / cite> ;, 
 line < em class =line> 1687< / em> ;, 
位于< code class =function> wsgi_app< / code>< / h4> 
< pre> response = self.full_dispatch_request（）< / pre> 
< / div> 
 
< li>< div class =frameid =frame-139714215149008> 
 
文件< cite class =filename>/ usr / lib / python2.6 / site-packages / flask / app.py< / cite> ;, 
 line < em class =line> 1360< / em> ;, 
在< code class =function> full_dispatch_request< / code>< / h4> 
< pre> rv = self.handle_user_exception（e）< / pre> 
< / div> 
 
< li>< div class =frameid =frame-139714215149200> 
< h4>文件< cite class =filename>/ usr / lib / python2.6 / site-packages / flask_restful / __init__.py< / cite> ;, 
 line < em class =line> 271< / em> ;, 
在< code class =function> error_router< / code>< / h4> 
< pre> return original_handler（e）< / pre> 
< / div> 
 
< li>< div class =frameid =frame-139714215149264> 
 文件< cite class =filename>/ usr / lib / python2.6 / site-packages / flask / app.py< / cite> ;, 
 line < em class =line> 1246< / em> ;, 
在< code class =function> handle_user_exception< / code>< / h4> 
< pre> assert exc_value is e< pre> 
< / div> 
< / ul> 
< blockquote> AssertionError< / blockquote> 
< / div> 
 
< div class =plain> 
< form action =http://paste.pocoo.org/method =post> 
< p> 
< input type =hiddenname =languagevalue =pytb> 
这是回溯的复制/粘贴友好版本。 < span 
 class =pastemessage>您也可以将此回溯贴到LodgeIt：
< input type =submitvalue =create paste>< / span> 
< / p> 
< textarea cols =50rows =10name =codereadonly> Traceback（最近一次调用最后一次）：
/usr/lib/python2.6/site-packages /flask/app.py，第1701行，在__call__ 
中返回self.wsgi_app（environ，start_response）
文件/usr/lib/python2.6/site-packages/flask/app.py ，第1689行，在wsgi_app 
 response = self.make_response（self.handle_exception（e））
文件/usr/lib/python2.6/site-packages/flask_restful/__init__.py，第271行，在error_router 
返回original_handler（e）
文件/usr/lib/python2.6/site-packages/flask_restful/__init__.py，第268行，在error_router 
返回self.handle_error（e）
文件/usr/lib/python2.6/site-packages/flask/app.py，第1687行，位于wsgi_app 
 response = self.full_dispatch_request（）
文件/usr/lib/python2.6/site-packages/flask/app.py，第1360行，在full_dispatch_request 
 rv = self.handle_user_exception（e）
文件/ usr / LIB / python2.6的/站点包/ flask_restful / __中it__.py，第271行，在error_router 
中返回original_handler（e）
文件/usr/lib/python2.6/site-packages/flask/app.py，行1246，在handle_user_exception 
断言exc_value是e 
 AssertionError< / textarea> 
< / form> 
< / div> 
< div class =explanation> 
调试器在您的WSGI应用程序中发现异常。你现在可以
看看导致错误的回溯。 < span class =nojavascript> 
如果您启用JavaScript，您还可以使用其他功能，例如代码
执行（如果已启用evalex功能），自动粘贴
例外等。< / span> 
< / div> 
< div class =footer> 
由< strong class =arthur> DO NOT PANIC< / strong>，您的
友好的Werkzeug支持的追踪解释器带给您。 
< / div> 
< / div> 
< / body> 
< / html> 
 
 <！ -  
 
 Traceback（最近的最后一次调用）：
文件/usr/lib/python2.6/site-packages/flask/ app.py，行1701，在__call__ 
返回self.wsgi_app（environ，start_response）
文件/usr/lib/python2.6/site-packages/flask/app.py，行1689，在wsgi_app 
 response = self.make_response（self.handle_exception（e））
文件/usr/lib/python2.6/site-packages/flask_restful/__init__.py，第271行，在error_router 
返回original_handler（e）
文件/usr/lib/python2.6/site-packages/flask_restful/__init__.py，第268行，在error_router 
返回self.handle_error （e）
文件/usr/lib/python2.6/site-packages/flask/app.py，行1687，位于wsgi_app 
 response = self.full_dispatch_request（）
文件/usr/lib/python2.6/site-packages/flask/app.py，第1360行，在full_dispatch_request 
 rv = self.handle_user_exception（e）
文件/ usr / lib / python2 .6 / site-packages / flask_restful / __init__.py，第271行，在error_router中
返回original_handler（e）
文件/usr/lib/python2.6/site-packages/flask/app.py，行1246，在handle_user_exception中
 assert exc_value是e 
 AssertionError 
 
  - >

这些都是在Centos 6.5上运行的，包含

Python 2.6.6

Flask（0.9）

Flask-RESTful（0.3.5） li>

编辑：如果我用 debug = False 运行服务器， / p>

  $ curl -i -HAccept：application / json-X PUT --dataarg1 = ABC& arg2 = A http://192.0.0.7:5001/v1.0/test/1 
 HTTP / 1.0 500内部服务器错误
 Content-Type：application / json 
 Content-Length：37 
服务器：Werkzeug / 0.8.3 Python / 2.6.6 
日期：2016年4月15日星期五12:50:37 GMT 
 
 {message：内部服务器错误解决方案

升级烧瓶到0.10.1，问题消失。

 
I'm using flask-RESTful for the first time. In the docs it says :

  Using the reqparse module also gives you sane error messages for free. If an argument fails to pass validation, Flask-RESTful will respond with a 400 Bad Request and a response highlighting the error.
However in my case, I get an exception AssertionError instead.

Here's the code:
#! /usr/bin/python
# -*- coding: UTF-8 -*-

from flask import Flask
from flask.ext.restful import Api, Resource, reqparse


class Test(Resource):
    @staticmethod
    def put(id):
        parser = reqparse.RequestParser()
        parser.add_argument('arg1')
        parser.add_argument('arg2', type=int, help='helptext')
        args = parser.parse_args()
        return args, 200

app = Flask(__name__)
api = Api(app)

api.add_resource(Test, '/v1.0/test/<int:id>', endpoint='test')

if __name__ == '__main__':
    app.run(host='0.0.0.0', port=5001, debug=True)
When I test this with right values, it works:
$ curl -i  -H "Accept: application/json"  -X PUT --data "arg1=ABC&arg2=1"     http://192.0.0.7:5001/v1.0/test/1
HTTP/1.0 200 OK
Content-Type: application/json
Content-Length: 38
Server: Werkzeug/0.8.3 Python/2.6.6
Date: Fri, 15 Apr 2016 11:59:48 GMT

{
    "arg1": "ABC", 
    "arg2": 1
}
However if I put a wrong value for arg2, instead of getting a status code 400 with an error message I get an exception:
curl -i  -H "Accept: application/json"  -X PUT --data "arg1=ABC&arg2=A"     http://192.0.0.7:5001/v1.0/test/1
HTTP/1.0 500 INTERNAL SERVER ERROR
Content-Type: text/html; charset=utf-8
Connection: close
Server: Werkzeug/0.8.3 Python/2.6.6
Date: Fri, 15 Apr 2016 12:04:25 GMT

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
  "http://www.w3.org/TR/html4/loose.dtd">
<html>
  <head>
    <title>AssertionError // Werkzeug Debugger</title>
    <link rel="stylesheet" href="?__debugger__=yes&amp;cmd=resource&amp;f=style.css" type="text/css">
    <script type="text/javascript" src="?__debugger__=yes&amp;cmd=resource&amp;f=jquery.js"></script>
    <script type="text/javascript" src="?__debugger__=yes&amp;cmd=resource&amp;f=debugger.js"></script>
    <script type="text/javascript">
      var TRACEBACK = 27516816,
          CONSOLE_MODE = false,
          EVALEX = true,
          SECRET = "uovVRKyVTy1b8gi5Yc3t";
    </script>
  </head>
  <body>
    <div class="debugger">
<h1>AssertionError</h1>
<div class="detail">
  <p class="errormsg">AssertionError</p>
</div>
<h2 class="traceback">Traceback <em>(most recent call last)</em></h2>
<div class="traceback">

  <ul><li><div class="frame" id="frame-27516688">
  <h4>File <cite class="filename">"/usr/lib/python2.6/site-packages/flask/app.py"</cite>,
      line <em class="line">1701</em>,
      in <code class="function">__call__</code></h4>
  <pre>return self.wsgi_app(environ, start_response)</pre>
</div>

<li><div class="frame" id="frame-139714215145552">
  <h4>File <cite class="filename">"/usr/lib/python2.6/site-packages/flask/app.py"</cite>,
      line <em class="line">1689</em>,
      in <code class="function">wsgi_app</code></h4>
  <pre>response = self.make_response(self.handle_exception(e))</pre>
</div>

<li><div class="frame" id="frame-139714215148944">
  <h4>File <cite class="filename">"/usr/lib/python2.6/site-packages/flask_restful/__init__.py"</cite>,
      line <em class="line">271</em>,
      in <code class="function">error_router</code></h4>
  <pre>return original_handler(e)</pre>
</div>

<li><div class="frame" id="frame-139714215149072">
  <h4>File <cite class="filename">"/usr/lib/python2.6/site-packages/flask_restful/__init__.py"</cite>,
      line <em class="line">268</em>,
      in <code class="function">error_router</code></h4>
  <pre>return self.handle_error(e)</pre>
</div>

<li><div class="frame" id="frame-139714215149136">
  <h4>File <cite class="filename">"/usr/lib/python2.6/site-packages/flask/app.py"</cite>,
      line <em class="line">1687</em>,
      in <code class="function">wsgi_app</code></h4>
  <pre>response = self.full_dispatch_request()</pre>
</div>

<li><div class="frame" id="frame-139714215149008">
  <h4>File <cite class="filename">"/usr/lib/python2.6/site-packages/flask/app.py"</cite>,
      line <em class="line">1360</em>,
      in <code class="function">full_dispatch_request</code></h4>
  <pre>rv = self.handle_user_exception(e)</pre>
</div>

<li><div class="frame" id="frame-139714215149200">
  <h4>File <cite class="filename">"/usr/lib/python2.6/site-packages/flask_restful/__init__.py"</cite>,
      line <em class="line">271</em>,
      in <code class="function">error_router</code></h4>
  <pre>return original_handler(e)</pre>
</div>

<li><div class="frame" id="frame-139714215149264">
  <h4>File <cite class="filename">"/usr/lib/python2.6/site-packages/flask/app.py"</cite>,
      line <em class="line">1246</em>,
      in <code class="function">handle_user_exception</code></h4>
  <pre>assert exc_value is e</pre>
</div>
</ul>
  <blockquote>AssertionError</blockquote>
</div>

<div class="plain">
  <form action="http://paste.pocoo.org/" method="post">
    <p>
      <input type="hidden" name="language" value="pytb">
      This is the Copy/Paste friendly version of the traceback.  <span
      class="pastemessage">You can also paste this traceback into LodgeIt:
      <input type="submit" value="create paste"></span>
    </p>
    <textarea cols="50" rows="10" name="code" readonly>Traceback (most recent call last):
  File "/usr/lib/python2.6/site-packages/flask/app.py", line 1701, in __call__
    return self.wsgi_app(environ, start_response)
  File "/usr/lib/python2.6/site-packages/flask/app.py", line 1689, in wsgi_app
    response = self.make_response(self.handle_exception(e))
  File "/usr/lib/python2.6/site-packages/flask_restful/__init__.py", line 271, in error_router
    return original_handler(e)
  File "/usr/lib/python2.6/site-packages/flask_restful/__init__.py", line 268, in error_router
    return self.handle_error(e)
  File "/usr/lib/python2.6/site-packages/flask/app.py", line 1687, in wsgi_app
    response = self.full_dispatch_request()
  File "/usr/lib/python2.6/site-packages/flask/app.py", line 1360, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/usr/lib/python2.6/site-packages/flask_restful/__init__.py", line 271, in error_router
    return original_handler(e)
  File "/usr/lib/python2.6/site-packages/flask/app.py", line 1246, in handle_user_exception
    assert exc_value is e
AssertionError</textarea>
  </form>
</div>
<div class="explanation">
  The debugger caught an exception in your WSGI application.  You can now
  look at the traceback which led to the error.  <span class="nojavascript">
  If you enable JavaScript you can also use additional features such as code
  execution (if the evalex feature is enabled), automatic pasting of the
  exceptions and much more.</span>
</div>
      <div class="footer">
        Brought to you by <strong class="arthur">DON'T PANIC</strong>, your
        friendly Werkzeug powered traceback interpreter.
      </div>
    </div>
  </body>
</html>

<!--

Traceback (most recent call last):
  File "/usr/lib/python2.6/site-packages/flask/app.py", line 1701, in __call__
    return self.wsgi_app(environ, start_response)
  File "/usr/lib/python2.6/site-packages/flask/app.py", line 1689, in wsgi_app
    response = self.make_response(self.handle_exception(e))
  File "/usr/lib/python2.6/site-packages/flask_restful/__init__.py", line 271, in error_router
    return original_handler(e)
  File "/usr/lib/python2.6/site-packages/flask_restful/__init__.py", line 268, in error_router
    return self.handle_error(e)
  File "/usr/lib/python2.6/site-packages/flask/app.py", line 1687, in wsgi_app
    response = self.full_dispatch_request()
  File "/usr/lib/python2.6/site-packages/flask/app.py", line 1360, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/usr/lib/python2.6/site-packages/flask_restful/__init__.py", line 271, in error_router
    return original_handler(e)
  File "/usr/lib/python2.6/site-packages/flask/app.py", line 1246, in handle_user_exception
    assert exc_value is e
AssertionError

-->
This is all running on a Centos 6.5 with


Python 2.6.6
Flask (0.9) 
Flask-RESTful (0.3.5)


EDIT: If I run the server with debug=False, I get:
$ curl -i  -H "Accept: application/json"  -X PUT --data "arg1=ABC&arg2=A"     http://192.0.0.7:5001/v1.0/test/1 
HTTP/1.0 500 INTERNAL SERVER ERROR
Content-Type: application/json
Content-Length: 37
Server: Werkzeug/0.8.3 Python/2.6.6
Date: Fri, 15 Apr 2016 12:50:37 GMT

{"message": "Internal Server Error"}

 解决方案 
Upgraded flask to 0.10.1 and the problem disappears.

                        这篇关于flask-RESTful：解析一个错误类型的参数时为什么会得到一个AssertionError？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！


                    
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flask-RESTful：解析一个错误类型的参数时为什么会得到一个AssertionError？ [英] flask-RESTful : why do I get an AssertionError when parsing an argument with the wrong type?

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flask-RESTful：解析一个错误类型的参数时为什么会得到一个AssertionError？ [英] flask-RESTful : why do I get an AssertionError when parsing an argument with the wrong type?

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