本内容遵循CC 4.0 BY-SA版权协议 在OOP中，有时你需要定义一个"接口"——规定子类必须实现哪些方法，但不提供默认实现（或只提供部分默认实现）。这就是抽象基类（ABC, Abstract Base Class）的用途。

This project demonstrates practical data analysis using Python and Pandas on an employee dataset. The analysis covers data inspection, filtering, aggregation, sorting, date-based analysis, grouping, ...

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