py学习（封装，继承，多态），，，其实都没有

因为，笔记在onenote记得太杂了，之前三篇都是一键ctrl v 额。。。。也不能啥也不写，这里就随缘写把

之前，找pycharm激活码找了很久，这里贴一个好像到期是2020年12月来着的激活码。。。要拿自便=。=

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