Django：使用 forms.DecimalField 的 max_decimal_places 选项时出现 TypeError

Question

我使用 Django 1.8 版。我有一个非常简单的表格，如下所示。它只包含一个字段，DecimalField。当我尝试渲染整个项目中的任何模板时，我得到

TypeError at /whatever/

__init__() got an unexpected keyword argument 'max_decimal_places'

这是我的完整 forms.py 文件：

from django import forms

class BidForm(forms.Form):
    amount = forms.DecimalField(label="Bid amount", max_decimal_places=2)

如果我删除错误消息似乎抱怨的 max_decimal_places=2 kwarg，我的网站呈现正常并且一切正常。

为什么我似乎无法使用 max_decimal_places？

后面是完整的堆栈跟踪。

Environment:


Request Method: GET
Request URL: http://myproject.username.webfactional.com/myapp/

Django Version: 1.8.4
Python Version: 3.4.1
Installed Applications:
('django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.messages',
 'django.contrib.admin',
 'django.contrib.staticfiles',
 'localflavor',
 'myapp')
Installed Middleware:
('django.contrib.sessions.middleware.SessionMiddleware',
 'django.middleware.common.CommonMiddleware',
 'django.middleware.csrf.CsrfViewMiddleware',
 'django.contrib.auth.middleware.AuthenticationMiddleware',
 'django.contrib.auth.middleware.SessionAuthenticationMiddleware',
 'django.contrib.messages.middleware.MessageMiddleware',
 'django.middleware.clickjacking.XFrameOptionsMiddleware',
 'django.middleware.security.SecurityMiddleware')


Traceback:
File "/home/username/webapps/myapplication/lib/python3.4/Django-1.8.4-py3.4.egg/django/core/handlers/base.py" in get_response
  119.                 resolver_match = resolver.resolve(request.path_info)
File "/home/username/webapps/myapplication/lib/python3.4/Django-1.8.4-py3.4.egg/django/core/urlresolvers.py" in resolve
  366.             for pattern in self.url_patterns:
File "/home/username/webapps/myapplication/lib/python3.4/Django-1.8.4-py3.4.egg/django/core/urlresolvers.py" in url_patterns
  402.         patterns = getattr(self.urlconf_module, "urlpatterns", self.urlconf_module)
File "/home/username/webapps/myapplication/lib/python3.4/Django-1.8.4-py3.4.egg/django/core/urlresolvers.py" in urlconf_module
  396.             self._urlconf_module = import_module(self.urlconf_name)
File "/usr/local/lib/python3.4/importlib/__init__.py" in import_module
  109.     return _bootstrap._gcd_import(name[level:], package, level)
File "/home/username/webapps/myapplication/myproject/myproject/urls.py" in <module>
  8.     url(r'^myapp/', include('myapp.urls', namespace='myapp')),
File "/home/username/webapps/myapplication/lib/python3.4/Django-1.8.4-py3.4.egg/django/conf/urls/__init__.py" in include
  33.         urlconf_module = import_module(urlconf_module)
File "/usr/local/lib/python3.4/importlib/__init__.py" in import_module
  109.     return _bootstrap._gcd_import(name[level:], package, level)
File "/home/username/webapps/myapplication/myproject/myapp/urls.py" in <module>
  2. from . import views
File "/home/username/webapps/myapplication/myproject/myapp/views.py" in <module>
  3. from .forms import BidForm
File "/home/username/webapps/myapplication/myproject/myapp/forms.py" in <module>
  3. class BidForm(forms.Form):
File "/home/username/webapps/myapplication/myproject/myapp/forms.py" in BidForm
  11.     amount = forms.DecimalField(label="Bid amount", max_decimal_places=2)
File "/home/username/webapps/myapplication/lib/python3.4/Django-1.8.4-py3.4.egg/django/forms/fields.py" in __init__
  334.         super(DecimalField, self).__init__(max_value, min_value, *args, **kwargs)
File "/home/username/webapps/myapplication/lib/python3.4/Django-1.8.4-py3.4.egg/django/forms/fields.py" in __init__
  245.         super(IntegerField, self).__init__(*args, **kwargs)

Exception Type: TypeError at /myapp/
Exception Value: __init__() got an unexpected keyword argument 'max_decimal_places'

Answer 1

参见 docs 关于 DecimalField

您可以使用 decimal_places:

The maximum number of decimal places permitted.

Django：使用 forms.DecimalField 的 max_decimal_places 选项时出现 TypeError

Django: TypeError when using max_decimal_places option of forms.DecimalField

python

forms

django

django-forms

django-1.8

TypeError at /whatever/