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# 第十五课 抽象数据类型，类与方法

## Lecture 15: Abstract data types,classes and methods

## 2017-11-17

* 上节课介绍了一些
* 如何定义一个抽象的类？
* 这节课对于学过面向对象的人比较简单，所以也就简单写了
* 主要介绍了几个概念
* 类是创建实例的模板 Class - template for creating instances of an object
* 数据隐藏就是指仅通过方法来访问数据 Data hiding - one can only access instance values through defined methods 
* Python不提供数据隐藏功能
* 一些python的内置方法，对象: self, \_\_init\_\_, \_\_str\_\_,

  \_\_cmp\_\_, \_\_eq\_\_,
* 重载


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