Django查找网站项目根目录和对正则表达式的支持
如果你想通过http://127.0.0.1:8000/看网站根目录你将看到一个404错误消息。Django不会增加任何东西在网站根目录，在任何情况下这个URL都不是特殊的 就像在URLconf中的其他条目一样，它也依赖于指定给它的URL模式.
尽管匹配网站根目录的URL模式不能想象，但是还是值得提一下的. 当为网站根目录实现一个视图，你需要使用URL模式`` ‘^$'`` , 它代表一个空字符串。 例如:
from mysite.views import hello, my_homepage_view
urlpatterns = patterns('',
('^$', my_homepage_view),
# ...
)
正则表达式 (或 regexes ) 是通用的文本模式匹配的方法。 Django URLconfs 允许你 使用任意的正则表达式来做强有力的URL映射，不过通常你实际上可能只需要使用很少的一 部分功能。 这里是一些基本的语法。
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