django - int 参数必须是字符串或数字，而不是“元组”

Posted 2023-02-24

【中文标题】django - int 参数必须是字符串或数字，而不是“元组”

【英文标题】：django - int argument must be a string or a number, not 'Tuple'

【发布时间】：2012-08-01 14:42:33

【问题描述】：

我已经看了几个小时，但我似乎无法理解为什么我会收到此消息...

int() argument must be a string or a number, not 'tuple'

在我的 views.py 的这一行上（注意：异常实际上发生在 django 核心的更深处，但这是我的代码行最终触发了异常）...

service_interest = ServiceInterest.objects.get_or_create(service = service, client = client)

为什么会出现此错误？为了您的利益，请参阅下面的 models.py、forms.py 和 views.py 中的 sn-p。

models.py：

class Client(models.Model):
  name = models.CharField(max_length=100)
  email = models.EmailField()
  site = models.URLField()
  contact_date = models.DateField(default = datetime.date.today())

class Service(models.Model):
  name = models.CharField(max_length=200)

class ServiceInterest(models.Model):
  service = models.ForeignKey('Service')
  client = models.ForeignKey('Client')

  class Meta:
    unique_together = ("service", "client")

forms.py...

class ContactForm(forms.Form):


SERVICE_CHOICES = (
    ('first_choice', 'Description of first choice'),
    ('second_choice', 'Description of second choice'),
    ('third_choice', 'Description of third choice'),
    ('other', 'Other')
  )

  SERVICE_CHOICES_DICT = dict(SERVICE_CHOICES)

  name = forms.CharField(label='What would you like us to call you?', max_length=200, required=False)
  email = forms.EmailField(label='What is your email address?', help_text='Ex: [e-mail]')
  url = forms.URLField(label='If you have a website, please provide a link', required=False, help_text="Ex: www.yoursite.com")
  service_interest = forms.MultipleChoiceField(label="Please check all of the services you're interested in:", widget=forms.widgets.CheckboxSelectMultiple, choices=SERVICE_CHOICES, required=True)
  other = forms.CharField(label='If you selected \"Other\", please specify:', max_length=200, required=False)
  message = forms.CharField(max_length=10000, required=False, label='Any other information you think we should know?', widget=forms.widgets.Textarea)

  def clean_other(self):
    cleaned_data = super(ContactForm, self).clean()
    if 'service_interest' in cleaned_data.keys():
      options = cleaned_data['service_interest']
      if 'other' in options:
        other_input = cleaned_data['other']
        if other_input == None or len(other_input) == 0:
          raise forms.ValidationError('Required when \"Other\" is checked')

    return cleaned_data

views.py 中的相关代码：

  name = form.cleaned_data['name']
  email = form.cleaned_data['email']
  url = form.cleaned_data['url']
  interests = form.cleaned_data['service_interest']
  other = form.cleaned_data['other']
  message = form.cleaned_data['message']

  client = Client.objects.get_or_create(name = name, email = email, site = url)
  for interest in interests:
    service = None
    if(interest != 'other'):
      service = Service.objects.get_or_create(name = ContactForm.SERVICE_CHOICES_DICT[interest])
    else:
      service = Service.objects.get_or_create(name = other)

    # Appears to be responsible for the stack trace, even though exception
    # is one level deeper in...
    # /Library/Python/2.7/site-packages/django/core/handlers/base.py in get_response
    service_interest = ServiceInterest.objects.get_or_create(service = service, client = client)

【问题讨论】：

如果我不得不猜测，我会说这是因为传递给 int() 的是一个元组，而不是字符串或数字。

【参考方案1】：

get_or_create 返回一个元组，格式为(instance, created)。第二个参数告诉你它是否必须创建它，很明显。请改为执行以下操作：

client, created = Client.objects.get_or_create(name = name, email = email, site = url)

【讨论】：

很奇怪。我原以为如果你说client = ...，而不是client, created = ...，那么（元组的）第二个“返回值”就会丢失。再说一次，我是 Python 的菜鸟 :)

不行，因为返回值是一个元组，所以整个元组都存放在变量中。逗号分隔的变量名列表有点神奇，它告诉 Python 解析器扩展返回值（假设是一个元组）并将值存储在各自的变量中。