Home Backend Development Python Tutorial Python的Django框架中的URL配置与松耦合

Python的Django框架中的URL配置与松耦合

Jun 10, 2016 pm 03:09 PM
django url

现在是好时机来指出Django和URL配置背后的哲学: 松耦合 原则。 简单的说,松耦合是一个 重要的保证互换性的软件开发方法。

Django的URL配置就是一个很好的例子。 在Django的应用程序中,URL的定义和视图函数之间是松 耦合的,换句话说,决定URL返回哪个视图函数和实现这个视图函数是在两个不同的地方。 这使得 开发人员可以修改一块而不会影响另一块。

例如,考虑一下current_datetime视图。 如果我们想把它的URL 从原来的 /time/ 改变到 /currenttime/ ,我们只需要快速的修改一下URL配置即可, 不用担心这个函数的内部实现。 同样的,如果我们想要修改这个函数的内部实现也不用担心会影响 到对应的URL。

此外,如果我们想要输出这个函数到 一些 URL, 我们只需要修改URL配置而不用 去改动视图的代码。 在这个例子里,current_datetime被两个URL使用。 这是一个故弄玄虚的例子,但这个方法迟早会用得上。

urlpatterns = patterns('',
  ('^hello/$', hello),
  ('^time/$', current_datetime),
  ('^another-time-page/$', current_datetime),
)

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