python - Django 中的空白 URL 模式

Question

我继承了一个 Django 应用程序，并注意到 urlpatterns +=patterns('') 以及整个 urls.py 中的等效内容。

例如

urlpatterns = patterns(
    '', 
    url(r'^index.html', render_index),
)

#... 

urlpatterns += patterns(
    '', 
    url(r'^page.html', another_controller),
)

这是在做什么？任何事物？

Answer 1

它在 patterns() 函数中是必需的，因为patterns() 的第一个参数用作 URL 的公共(public) View 前缀。来自文档:

urlpatterns = patterns('',
    (r'^articles/(\d{4})/$', 'news.views.year_archive'),
    (r'^articles/(\d{4})/(\d{2})/$', 'news.views.month_archive'),
    (r'^articles/(\d{4})/(\d{2})/(\d+)/$', 'news.views.article_detail'),
)

更简单地写为:

urlpatterns = patterns('news.views',
    (r'^articles/(\d{4})/$', 'year_archive'),
    (r'^articles/(\d{4})/(\d{2})/$', 'month_archive'),
    (r'^articles/(\d{4})/(\d{2})/(\d+)/$', 'article_detail'),
)

但是，从 Django 1.8 开始，urls.py 中的 urlpatterns 变量是使用一个简单的列表创建的:

urlpatterns = [ 
    url(r'^index.html', render_index),
    url(r'^page.html', another_controller),
]

并且不需要此 View 前缀参数。