我的代码中有Django错误，我应该怎么做

Question

from django.core.management import setup_environ
from register2 import settings
setup_environ(settings)


from django import forms
from django.contrib.auth.forms import AuthenticationForm
from django.utils.translation import ugettext_lazy as _


class AuthenticationRememberMeForm ( AuthenticationForm ):

            """
            Subclass of Django ``AuthenticationForm`` which adds a remember me checkbox.

            """

            remember_me = forms.BooleanField (
                label = _( 'Remember Me' ),
                initial = False,
                required = False,
                )

print AuthenticationRememberMeForm.remember_me


Traceback (most recent call last):
  File "D:\zjm_code\register2\b.py", line 26, in <module>
    print AuthenticationRememberMeForm['remember_me']
TypeError: 'DeclarativeFieldsMetaclass' object is unsubscriptable

Answer 1

djangoforms模块使用元类来简化表单字段的声明性语法。因此，您应该将remember_me视为窗体实例的字段，而不是类属性。所以访问这个领域是有意义的：

form = AuthenticationRememberMeForm()
field_obj = form.fields['remember_me']

或者，类似地，值：

^{pr2}$

显然，django.forms正在幕后做一些工作来实现这一点。如果您想了解如何操作，请查看relevant code。如果您只想让您的表单有效，请尝试遵循usage outlined in the docs。在