python - 属性错误 : 'str' object has no attribute 'regex' django 1. 9

Question

我正在使用 django 1.9，目前正在编写代码 - 在 Windows 命令提示符中 - 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 中编码，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

还要确保删除开头的空 url 模式——在迁移 url 时可能会被忽略。

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

tl;dr

出于好奇，我通过向 django.core.checks.urls 模块中的 check_pattern_startswith_slash 方法添加警告发现了这一点:

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]

果然，我收到了一堆这样的警告:

?: (urls.W002) Invalid pattern ''