-check"></i><b>12.2</b> GroupBy高级应用</a></li>
<li class="chapter" data-level="12.3" data-path="adPandas.html"><a href="adPandas.html#section-12.3"><i class="fa fa-check"></i><b>12.3</b> 链式编程技术</a></li>
<li class="chapter" data-level="12.4" data-path="adPandas.html"><a href="adPandas.html#-9"><i class="fa fa-check"></i><b>12.4</b> 总结</a></li>
</ul></li>
<li class="chapter" data-level="13" data-path="buildModels.html"><a href="buildModels.html"><i class="fa fa-check"></i><b>13</b> Pytho