int（）的无效文字为10：'on'Python-Django [英] invalid literal for int() with base 10: 'on' Python-Django

问题描述

我正在从官方django教程中学习django。我从表单投票时收到这个错误。这是由...可能 - 投票函数在views.py

这是我的views.py / vote函数：

  def vote（request，poll_id）：
p = get_object_or_404（Poll，pk = poll_id）
 try：
 selected_choice = p.choice_set.get pk = request.POST ['choice']）
 except（KeyError，Choice.DoesNotExist）：
 return render_to_response（'polls / detail.html'，{'poll'：p，
 'error_message'：didint select anything，}，context_instance = RequestContext（request）
 
 else：
 selected_choice.votes + = 1 
 selected_choice.save（）
 return HttpResponseRedirect（reverse（'polls.views.results'，args =（p.id，）））
  

这是错误消息屏幕：

** / errors / 2 / vote /

$ b中的ValueError
$ b

int（）与ba的无效文字se 10：'on'**

请求方法：POST请求URL：127.0.0.1:8000/polls/2/vote /

Django版本：1.4异常类型：ValueError异常值：
基数为10的int（）的无效字面值：'on'异常
位置：/ usr / local / lib / python2 .7 / dist-packages / django / db / models / fields / init .py
在get_prep_value中，第537行

，这里是我的投票/ urls.py：

 从django.conf.urls导入模式， include，url 
  

urlpatterns = patterns（'polls.views'，

  url（r'^ $'，'index'），
 url（r'^（？P< poll_id> \d +）/ $ '，'detail'），
 url（r'^（？P< poll_id> \d +）/ results / $'，'results'），
 url（r'^（？P < poll_id> \d +）/ vote / $'，'vote'），
  

）

，这里是project / urls.py：

  from django.conf.urls import patterns，include，url 
  

urlpatterns = patterns（'polls.views'，

  url（r'^ $'，'index'），
 url（r'^（？P< poll_id> \d +）/ $'，'detail'），
 url（r'^（？P< poll_id> \d +）/ results / $'结果'），
 url（r'^（？P< poll_id> \d +）/ vote / $'，'vote'），
  

）

解决方案

当您尝试时会收到此错误将一个字符串转换为一个整数，但字符串并不真正包含任何数字：

ie

  number = int（string）
  

从你的代码中，三个地方我看到一个整数的使用和可能的演员。当 p = get_object_or_404（Poll，pk = poll_id）时，我们假设您已正确传入一个整数作为poll_id。你可以发布你使用的urlpattern与这个视图和一个示例URL？

你也假设 request.POST [ 'choice'] 将是一个整数，可以这样转换。您没有捕获与此相关的异常，因此您需要检查此条目的值。我会在这个部分添加一些其他检查：

  if request.method ==POST：
 choice = request.POST.get（'choice'，None）
如果选择不是无：
 selected_choice = p.choice_set.get（pk = choice）
 ... 
  

这两个脱颖而出。

请发贴你的urlpattern和你收到的错误消息（比如哪个特定的行是抛出你的异常）。

i am learning django from official django tutorial. and i am getting this error when vote something from form. this caused from - probably - vote function under views.py

here is my views.py / vote function :

def vote(request,poll_id):
    p=get_object_or_404(Poll, pk=poll_id)
    try:
            selected_choice = p.choice_set.get(pk=request.POST['choice'])
    except (KeyError, Choice.DoesNotExist):
            return render_to_response('polls/detail.html', {'poll':p,
                                                            'error_message' : "didint select anything ",}, context_instance= RequestContext(request))

    else:
            selected_choice.votes += 1
            selected_choice.save()
            return HttpResponseRedirect(reverse('polls.views.results', args=(p.id,)))

and this is error message screen :

**ValueError at /polls/2/vote/

invalid literal for int() with base 10: 'on'**

Request Method: POST Request URL: 127.0.0.1:8000/polls/2/vote/

Django Version: 1.4 Exception Type: ValueError Exception Value: invalid literal for int() with base 10: 'on' Exception Location: /usr/local/lib/python2.7/dist-packages/django/db/models/fields/init.py in get_prep_value, line 537

and here is my polls/urls.py :

from django.conf.urls import patterns, include, url

urlpatterns = patterns('polls.views',

    url(r'^$', 'index'),
    url(r'^(?P<poll_id>\d+)/$','detail'),
    url(r'^(?P<poll_id>\d+)/results/$','results'),
    url(r'^(?P<poll_id>\d+)/vote/$','vote'),

)

and here is project/urls.py :

from django.conf.urls import patterns, include, url

urlpatterns = patterns('polls.views',

    url(r'^$', 'index'),
    url(r'^(?P<poll_id>\d+)/$','detail'),
    url(r'^(?P<poll_id>\d+)/results/$','results'),
    url(r'^(?P<poll_id>\d+)/vote/$','vote'),

)

解决方案

You'll receive this error when you're trying to cast a string to an integer, but the string doesn't really contain any digits:

i.e.

number = int(string)

From your code, there are three places where I see the use and probable cast of an integer. When p=get_object_or_404(Poll, pk=poll_id) we're making an assumption that you've correctly passed in an integer as poll_id. Could you post the urlpattern you're using associated with this view and an example URL?

You also are making an assumption that request.POST['choice'] will be an integer and can be cast as such. You aren't catching an exception related to this, so you'll want to check what the value of this entry is. I would add in a few other checks for this part:

if request.method=="POST":
    choice = request.POST.get('choice', None)
    if choice is not None:
        selected_choice = p.choice_set.get(pk=choice)
...

These two stand out the most.

Please post your urlpattern and more of the error message you were getting (such as which specific line is throwing your exception).

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