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<li class="chapter" data-level="5.1" data-path="preparation.html"><a href="preparation.html#pandas"><i class="fa fa-check"></i><b>5.1</b> pandas的数据结构介绍</a></li>
<li class="chapter" data-level="5.2" data-path="pandas.html"><a href="pandas.html"><i class="fa fa-check"></i><b>5.2</b> 基本功能</a></li>
<li class="chapter" data-level="5.3" data-path="pandas.html"><a href="pandas.html#section-5.3"><i class="fa fa-check"></i><b>5.3</b> 汇总和计算描述统计</a></li>
<li class="chapter" da