The parent classes in turn contain introspective methods that look for features of the instance to operate.
父类反过来包含查找实例的功能以进行操作的内省(introspective)方法。
The primary advantage of descriptor methods over introspective approaches is the ability to provide more specific messages.
描述符方法优于内省式方法的主要一点是可以提供更特定的消息。
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