AttributeError:'str'对象没有属性'regex'django 1.9

Question

我正在使用django 1.9,我目前正在编码 - 在Windows命令提示符 - python manage.py makemigrations和错误:

AttributeError:'str'对象没有属性'regex'

我试过编码:

url(r'^$', 'firstsite.module.views.start', name="home"),
url(r'^admin/', include(admin.site.urls)),
url(r'^$', 'django.contrib.auth.views.login', {'template_name': 'login.html'}, name='login'),
url(r'^signup/$', 'exam.views.signup', name='signup'),
url(r'^signup/submit/$', 'exam.views.signup_submit', name='signup_submit')

在urls.py中,错误不断出现.

这是我第一次在django编码,所以我的专业知识非常有限.先感谢您.

这是整个urls.py:

from django.conf.urls import patterns, include, url
import django
# Uncomment the next two lines to enable the admin:
from django.contrib import admin
admin.autodiscover()
from django.conf.urls.static import static
from django.conf import settings

urlpatterns = patterns('',
  # Examples:
  # url(r'^$', 'firstsite.views.home', name='home'),
  # url(r'^firstsite/', include('firstsite.foo.urls')),

  # Uncomment the admin/doc line below to enable admin documentation:
  # url(r'^admin/doc/', include('django.contrib.admindocs.urls')),

  # Uncomment the next line to enable the admin:
  #url(r'^admin/', include(admin.site.urls)),

  django.conf.urls.handler400,

  url(r'^$', 'firstsite.module.views.start', name="home"),
  url(r'^admin/', include(admin.site.urls)),
  url(r'^$', 'django.contrib.auth.views.login', {'template_name': 'login.html'}, name='login'),
  url(r'^signup/$', 'exam.views.signup', name='signup'),
  url(r'^signup/submit/$', 'exam.views.signup_submit', name='signup_submit'),
  )

Answer 1

首先,django.conf.urls.handler400从urlpatterns的中间删除.它不属于那里,并且是错误的原因.

一旦修复了错误,您可以进行一些更改以更新Django 1.8+的代码

1. 更改urlpatterns为列表,而不是使用patterns()

2. 导入视图(或视图模块),而不是使用您的字符串 urls()

3. 您正在使用相同的正则表达式start和login视图.这意味着您将无法访问登录视图.一个修复方法是将登录视图的正则表达式更改为类似的内容^login/$

把它们放在一起,就会得到类似的东西:

from firstsite.module.views import start
from exam import views as exam_views
from django.contrib.auth import views as auth_views

urlpatterns = [
  url(r'^$', start, name="home"),
  url(r'^admin/', include(admin.site.urls)),
  url(r'^login/$', auth_views.login, {'template_name': 'login.html'}, name='login'),
  url(r'^signup/$', exam_views.signup, name='signup'),
  url(r'^signup/submit/$', exam_views.signup_submit, name='signup_submit'),
]

Answer 2

还要确保删除开始的空网址模式 - 迁移网址时可能会被忽略.

urlpatterns = ['', # <== this blank element ('') produces the error.
    ...
]

TL;博士

对于好奇,我通过向模块中的check_pattern_startswith_slash方法添加警告来发现这一点django.core.checks.urls:

def check_pattern_startswith_slash(pattern):
    """
    Check that the pattern does not begin with a forward slash.
    """
    if not hasattr(pattern, 'regex'):
        warning = Warning(
            "Invalid pattern '%s'" % pattern,
            id="urls.W002",
        )
        return [warning]

而且,果然,我得到了一堆像这样的警告:

?: (urls.W002) Invalid pattern ''