为了让此类情景更易于读懂，也为了避免必须多次重用相同的方法名，在Python版本2.4中引入了方法修饰符。

To make situations like this more readable and to avoid having to reuse the same method name multiple times, method decorators were introduced in Python version 2.4.

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标注作为修饰符，可以添加到包、类、接口、方法或字段声明中。

Annotations serve as modifiers that can be added to packages, classes, interfaces, methods, or field declarations.

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default 这个特殊方法使用 @cherrypy.expose 修饰符标记为 CherryPy 处理程序函数。

The special method default is marked as a CherryPy handler function by the @cherrypy.expose decorator.

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