说明：  pandas是一个Python包，它提供了快速、灵活和富有表现力的数据结构，旨在使处理“关系”或“标记”的数据既简单又直观。它的目标是成为在Python中进行实际的、真实的数据分析的基本高层构建块。此外，它还有一个更广泛的目标，即成为任何语言中可用的最强大和最灵活的开源数据分析/操作工具。
(Pandas is a python package that provides fast, flexible, and expressive data structures designed to make dealing with "relational" or "tagged" data simple and intuitive. Its goal is to be a basic high-level building block for actual, real-world data analysis in Python. In addition, it has a broader goal of becoming the most powerful and flexible open source data analysis / manipulation tool available in any language.)