Django URL调度详述(国外英文资料).doc

Django URL调度详述(国外英文资料) For high quality WEB applications, there is a clean and elegant the URL of the scheduling mechanism is crucial. Django allows you to design URLs according to need, no framework layer. There is no need for.php or.cgi extensions or ugly things like 0, 20971-1-1928,00. See the Cool URIs dont change written by Tim berners-lee, the creator of WWW. The topic of this article is why the URL should be clean and easy to use. 1 overview For an application design URLs, to generate a called URLconf informal Python module (URL). The module is pure Python code, its role is in the URL patterns (a simple regular expression) and Python callback function mapping between (your views). This fundamental need mapping can be very short, can be very long. It can refer to other mapping. Because it is pure Python code, and have the ability to dynamically create the mapping. How Django handles a request (request) When the user requests a page, the following algorithm determines which Python code to execute: Django first checks for ROOT_URLCONF Settings in the Settings file. This is an absolute path string for Python imports URLconf. For example: mydjangoapps. Urls. Django loads the Python module and looks for the variable urlpatterns. The variable is a list of elements of a Django.conf. The Django sequence handles each URL pattern until you find a pattern matching the request URL. Once the match is successful, the Django import and call the corresponding view, namely the corresponding Python functions. This view function will get a request object as its first parameter, in the regular expression match other values are passed to the view as other parameters. Example 3 Here is an example of URLconf: From the django. Conf. Urls. Defaults import * urlpatterns = patterns ( , (r ^ articles / 2003 / $, news. Views. Special_case_2003 ), (r ^ articles/(d {4}) / $, news. Views. Year_archive ), (r ^ articles/(d {4})/(d {2}) / $, news. Views. Month_archive ), (r ^ articles/(d {4})/(