属性类(Attribute Classes) 带有基类(base class)的模块也将提供一组被实例化的类,通常是带有可选的
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怎样处理异常(How Exceptions Are Handled) 常用的异常类 ( Common Exception Classes ) 类属性(Attribute Classes) ..
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These attributes are defined as attribute classes.
这些属性(attribute)被定义为属性类。
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Attribute classes have positional and named parameters.
特性类具有定位参数和命名参数。
Seal attribute classes whenever possible, so that classes cannot be derived from them.
尽可能密封特性类,以便不能从它们派生类。
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