利用Django開發網站，可以設計出非常優美的url規則，如果url的匹配規則（包含正則表達式）組織得比較好，view的結構就會比較清晰，比較容易維護。
最簡單的形式
[python] view plain copy print?
<code>
from django.conf.urls import patterns, url
urlpatterns = patterns('',
url(r'^articles/2003/$', 'news.views.special_case_2003'),
url(r'^articles/(\d{4})/$', 'news.views.year_archive'),
url(r'^articles/(\d{4})/(\d{2})/$', 'news.views.month_archive'),
url(r'^articles/(\d{4})/(\d{2})/(\d+)/$', 'news.views.article_detail'),
)</code>
其中，正則表達式中組匹配出來的結果可以作為positional parameters傳遞給view.
如果url是www.yourdomain/articles/2005/，則會匹配第二條規則，執行news.views.year_archive('2005').
注意點
域名部分會被過濾掉
articles的前面不需要添加/，因為前序url的末尾一定會有/
任何組匹配的變量，都會議字符串的形式傳遞給view, 雖然通過(\d{4})匹配出了2005，但2005任然會被當做字符串傳遞給year_archive
利用named group來傳遞參數
可以通過以下形式為特定的組指定一個名稱.
[python] view plain copy print?
urlpatterns = patterns('',
url(r'^articles/2003/$', 'news.views.special_case_2003'),
url(r'^articles/(?P<year>\d{4})/$', 'news.views.year_archive'),
url(r'^articles/(?P<year>\d{4})/(?P<month>\d{2})/$', 'news.views.month_archive'),
url(r'^articles/(?P<year>\d{4})/(?P<month>\d{2})/(?P<day>\d{2})/$', 'news.views.article_detail'),
)
這樣的話，組的匹配結果會通過keyword parameters的形式傳遞給view.例如year_archive(year='2005')
利用named group可以為view指定一個默認參數來匹配多條規則。
[python] view plain copy print?
# URLconf
from django.conf.urls import patterns, url
urlpatterns = patterns('',
url(r'^blog/$', 'blog.views.page'),
url(r'^blog/page(?P<num>\d+)/$', 'blog.views.page'),
)
# View (in blog/views.py)
def page(request, num="1"):
# Output the appropriate page of blog entries, according to num.
指定view前綴(提取公因式)
patterns函數的第一個參數即是view的前綴
[python] view plain copy print?
from django.conf.urls import patterns, url
urlpatterns = patterns('news.views',
url(r'^articles/(\d{4})/$', 'year_archive'),
url(r'^articles/(\d{4})/(\d{2})/$', 'month_archive'),
url(r'^articles/(\d{4})/(\d{2})/(\d+)/$', 'article_detail'),
)
指定多個view前綴
[python] view plain copy print?
urlpatterns = patterns('myapp.views',
url(r'^$', 'app_index'),
url(r'^(?P<year>\d{4})/(?P<month>[a-z]{3})/$','month_display'),
)
urlpatterns += patterns('weblog.views',
url(r'^tag/(?P<tag>\w+)/$', 'tag'),
)
include其它匹配模塊
[python] view plain copy print?
from django.conf.urls import include, patterns, url
urlpatterns = patterns('',
# ... snip ...
url(r'^comments/', include('django.contrib.comments.urls')),
url(r'^community/', include('django_website.aggregator.urls')),
url(r'^contact/', include('django_website.contact.urls')),
# ... snip ...
)
當然也可以直接include其它patterns
[python] view plain copy print?
from django.conf.urls import include, patterns, url
extra_patterns = patterns('',
url(r'^reports/(?P<id>\d+)/$', 'credit.views.report'),
url(r'^charge/$', 'credit.views.charge'),
)
urlpatterns = patterns('',
url(r'^$', 'apps.main.views.homepage'),
url(r'^help/', include('apps.help.urls')),
url(r'^credit/', include(extra_patterns)),
)
為view函數傳遞額外參數
[python] view plain copy print?
from django.conf.urls import patterns, url
urlpatterns = patterns('blog.views',
url(r'^blog/(?P<year>\d{4})/$', 'year_archive', {'foo': 'bar'}),
)
直接使用view函數
[python] view plain copy print?
from django.conf.urls import patterns, url
from mysite.views import archive, about, contact
urlpatterns = patterns('',
url(r'^archive/$', archive),
url(r'^about/$', about),
url(r'^contact/$', contact),
)