diff --git a/_config.yml b/_config.yml
index 3545848..4d8466a 100644
--- a/_config.yml
+++ b/_config.yml
@@ -33,3 +33,9 @@ only_build_toc_files: true
 html:
   use_issues_button: true
   use_repository_button: true
+
+sphinx:
+  config:
+    bibtex_reference_style: author_year  # or label, super, \supercite
+    numfig_format: {'figure': '图 %s', 'table': '表 %s',
+                 'code-block': '代码片段 %s', 'section': '章节 %s'}
diff --git a/_toc.yml b/_toc.yml
index bfd1687..9b0df3f 100644
--- a/_toc.yml
+++ b/_toc.yml
@@ -5,6 +5,7 @@ format: jb-book
 root: index
 parts:
   - caption: 数据处理与计算
+    numbered: 2
     chapters:
     - file: ch-numpy/index
       sections:
diff --git a/docs/ch-numpy/index.html b/docs/ch-numpy/index.html
index d6032af..f7dd133 100644
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-    <title>NumPy &#8212; Python 数据科学实战</title>
+    <title>1. NumPy &#8212; Python 数据科学实战</title>
   
   
   
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-    <link rel="next" title="NumPy 简介" href="numpy-intro.html" />
+    <link rel="next" title="1.1. NumPy 简介" href="numpy-intro.html" />
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   <meta name="viewport" content="width=device-width, initial-scale=1"/>
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@@ -169,21 +169,21 @@
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-<li class="toctree-l2"><a class="reference internal" href="random.html">随机数生成</a></li>
+<li class="toctree-l1 current active has-children"><a class="current reference internal" href="#">1. NumPy</a><input checked="" class="toctree-checkbox" id="toctree-checkbox-1" name="toctree-checkbox-1" type="checkbox"/><label class="toctree-toggle" for="toctree-checkbox-1"><i class="fa-solid fa-chevron-down"></i></label><ul>
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+<li class="toctree-l2"><a class="reference internal" href="ndarray.html">1.2. ndarray</a></li>
+<li class="toctree-l2"><a class="reference internal" href="ndarray-slicing-index.html">1.3. 切片与索引</a></li>
+<li class="toctree-l2"><a class="reference internal" href="random.html">1.4. 随机数生成</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="../ch-pandas/dataframe-groupby.html">分组汇总</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../ch-pandas/dataframe-merge-concat.html">多表操作</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../ch-pandas/dataframe-pivot-melt.html">数据透视</a></li>
+<li class="toctree-l1 has-children"><a class="reference internal" href="../ch-pandas/index.html">2. pandas</a><input class="toctree-checkbox" id="toctree-checkbox-2" name="toctree-checkbox-2" type="checkbox"/><label class="toctree-toggle" for="toctree-checkbox-2"><i class="fa-solid fa-chevron-down"></i></label><ul>
+<li class="toctree-l2"><a class="reference internal" href="../ch-pandas/pandas-intro.html">2.1. pandas 简介</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../ch-pandas/series-dataframe.html">2.2. Series 与 DataFrame</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../ch-pandas/dataframe-slicing.html">2.3. 数据切片</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../ch-pandas/data-preprocessing.html">2.4. 数据处理</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../ch-pandas/dataframe-groupby.html">2.5. 分组汇总</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../ch-pandas/dataframe-merge-concat.html">2.6. 多表操作</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../ch-pandas/dataframe-pivot-melt.html">2.7. 数据透视</a></li>
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 </li>
 </ul>
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   <section class="tex2jax_ignore mathjax_ignore" id="numpy">
-<h1>NumPy<a class="headerlink" href="#numpy" title="Permalink to this heading">#</a></h1>
+<h1><span class="section-number">1. </span>NumPy<a class="headerlink" href="#numpy" title="Permalink to this heading">#</a></h1>
 <p>本节主要讲解如何使用 NumPy 进行高维数组计算。</p>
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-<li class="toctree-l1"><a class="reference internal" href="random.html">随机数生成</a></li>
+<li class="toctree-l1"><a class="reference internal" href="numpy-intro.html">1.1. NumPy 简介</a></li>
+<li class="toctree-l1"><a class="reference internal" href="ndarray.html">1.2. ndarray</a></li>
+<li class="toctree-l1"><a class="reference internal" href="ndarray-slicing-index.html">1.3. 切片与索引</a></li>
+<li class="toctree-l1"><a class="reference internal" href="random.html">1.4. 随机数生成</a></li>
 </ul>
 </div>
 </section>
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        title="next page">
       <div class="prev-next-info">
         <p class="prev-next-subtitle">next</p>
-        <p class="prev-next-title">NumPy 简介</p>
+        <p class="prev-next-title"><span class="section-number">1.1. </span>NumPy 简介</p>
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       <i class="fa-solid fa-angle-right"></i>
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-    <title>切片与索引 &#8212; Python 数据科学实战</title>
+    <title>1.3. 切片与索引 &#8212; Python 数据科学实战</title>
   
   
   
@@ -65,8 +65,8 @@
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     <link rel="index" title="Index" href="../genindex.html" />
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-    <link rel="next" title="随机数生成" href="random.html" />
-    <link rel="prev" title="ndarray" href="ndarray.html" />
+    <link rel="next" title="1.4. 随机数生成" href="random.html" />
+    <link rel="prev" title="1.2. ndarray" href="ndarray.html" />
   <meta name="viewport" content="width=device-width, initial-scale=1"/>
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@@ -169,21 +169,21 @@
         </ul>
         <p aria-level="2" class="caption" role="heading"><span class="caption-text">数据处理与计算</span></p>
 <ul class="current nav bd-sidenav">
-<li class="toctree-l1 current active has-children"><a class="reference internal" href="index.html">NumPy</a><input checked="" class="toctree-checkbox" id="toctree-checkbox-1" name="toctree-checkbox-1" type="checkbox"/><label class="toctree-toggle" for="toctree-checkbox-1"><i class="fa-solid fa-chevron-down"></i></label><ul class="current">
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-<li class="toctree-l2"><a class="reference internal" href="random.html">随机数生成</a></li>
+<li class="toctree-l1 current active has-children"><a class="reference internal" href="index.html">1. NumPy</a><input checked="" class="toctree-checkbox" id="toctree-checkbox-1" name="toctree-checkbox-1" type="checkbox"/><label class="toctree-toggle" for="toctree-checkbox-1"><i class="fa-solid fa-chevron-down"></i></label><ul class="current">
+<li class="toctree-l2"><a class="reference internal" href="numpy-intro.html">1.1. NumPy 简介</a></li>
+<li class="toctree-l2"><a class="reference internal" href="ndarray.html">1.2. ndarray</a></li>
+<li class="toctree-l2 current active"><a class="current reference internal" href="#">1.3. 切片与索引</a></li>
+<li class="toctree-l2"><a class="reference internal" href="random.html">1.4. 随机数生成</a></li>
 </ul>
 </li>
-<li class="toctree-l1 has-children"><a class="reference internal" href="../ch-pandas/index.html">pandas</a><input class="toctree-checkbox" id="toctree-checkbox-2" name="toctree-checkbox-2" type="checkbox"/><label class="toctree-toggle" for="toctree-checkbox-2"><i class="fa-solid fa-chevron-down"></i></label><ul>
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-<li class="toctree-l2"><a class="reference internal" href="../ch-pandas/series-dataframe.html">Series 与 DataFrame</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../ch-pandas/dataframe-slicing.html">数据切片</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../ch-pandas/data-preprocessing.html">数据处理</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../ch-pandas/dataframe-groupby.html">分组汇总</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../ch-pandas/dataframe-merge-concat.html">多表操作</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../ch-pandas/dataframe-pivot-melt.html">数据透视</a></li>
+<li class="toctree-l1 has-children"><a class="reference internal" href="../ch-pandas/index.html">2. pandas</a><input class="toctree-checkbox" id="toctree-checkbox-2" name="toctree-checkbox-2" type="checkbox"/><label class="toctree-toggle" for="toctree-checkbox-2"><i class="fa-solid fa-chevron-down"></i></label><ul>
+<li class="toctree-l2"><a class="reference internal" href="../ch-pandas/pandas-intro.html">2.1. pandas 简介</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../ch-pandas/series-dataframe.html">2.2. Series 与 DataFrame</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../ch-pandas/dataframe-slicing.html">2.3. 数据切片</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../ch-pandas/data-preprocessing.html">2.4. 数据处理</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../ch-pandas/dataframe-groupby.html">2.5. 分组汇总</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../ch-pandas/dataframe-merge-concat.html">2.6. 多表操作</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../ch-pandas/dataframe-pivot-melt.html">2.7. 数据透视</a></li>
 </ul>
 </li>
 </ul>
@@ -401,7 +401,7 @@ <h2> Contents </h2>
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-<h1>切片与索引<a class="headerlink" href="#id1" title="Permalink to this heading">#</a></h1>
+<h1><span class="section-number">1.3. </span>切片与索引<a class="headerlink" href="#id1" title="Permalink to this heading">#</a></h1>
 <p>索引（Index）从 <code class="docutils literal notranslate"><span class="pre">ndarray</span></code> 里定位所需要的数据，切片（Slice）从 <code class="docutils literal notranslate"><span class="pre">ndarray</span></code> 里选择一些数据。切片和索引都是在 <code class="docutils literal notranslate"><span class="pre">ndarray</span></code> 上选择所需要的数据。</p>
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       <i class="fa-solid fa-angle-left"></i>
       <div class="prev-next-info">
         <p class="prev-next-subtitle">previous</p>
-        <p class="prev-next-title">ndarray</p>
+        <p class="prev-next-title"><span class="section-number">1.2. </span>ndarray</p>
       </div>
     </a>
     <a class="right-next"
@@ -637,7 +637,7 @@ <h3>切片<a class="headerlink" href="#id7" title="Permalink to this heading">#<
        title="next page">
       <div class="prev-next-info">
         <p class="prev-next-subtitle">next</p>
-        <p class="prev-next-title">随机数生成</p>
+        <p class="prev-next-title"><span class="section-number">1.4. </span>随机数生成</p>
       </div>
       <i class="fa-solid fa-angle-right"></i>
     </a>
diff --git a/docs/ch-numpy/ndarray.html b/docs/ch-numpy/ndarray.html
index 51c33e1..02deab1 100644
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-    <title>ndarray &#8212; Python 数据科学实战</title>
+    <title>1.2. ndarray &#8212; Python 数据科学实战</title>
   
   
   
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-    <link rel="prev" title="NumPy 简介" href="numpy-intro.html" />
+    <link rel="next" title="1.3. 切片与索引" href="ndarray-slicing-index.html" />
+    <link rel="prev" title="1.1. NumPy 简介" href="numpy-intro.html" />
   <meta name="viewport" content="width=device-width, initial-scale=1"/>
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@@ -171,21 +171,21 @@
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         <p aria-level="2" class="caption" role="heading"><span class="caption-text">数据处理与计算</span></p>
 <ul class="current nav bd-sidenav">
-<li class="toctree-l1 current active has-children"><a class="reference internal" href="index.html">NumPy</a><input checked="" class="toctree-checkbox" id="toctree-checkbox-1" name="toctree-checkbox-1" type="checkbox"/><label class="toctree-toggle" for="toctree-checkbox-1"><i class="fa-solid fa-chevron-down"></i></label><ul class="current">
-<li class="toctree-l2"><a class="reference internal" href="numpy-intro.html">NumPy 简介</a></li>
-<li class="toctree-l2 current active"><a class="current reference internal" href="#">ndarray</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="random.html">随机数生成</a></li>
+<li class="toctree-l1 current active has-children"><a class="reference internal" href="index.html">1. NumPy</a><input checked="" class="toctree-checkbox" id="toctree-checkbox-1" name="toctree-checkbox-1" type="checkbox"/><label class="toctree-toggle" for="toctree-checkbox-1"><i class="fa-solid fa-chevron-down"></i></label><ul class="current">
+<li class="toctree-l2"><a class="reference internal" href="numpy-intro.html">1.1. NumPy 简介</a></li>
+<li class="toctree-l2 current active"><a class="current reference internal" href="#">1.2. ndarray</a></li>
+<li class="toctree-l2"><a class="reference internal" href="ndarray-slicing-index.html">1.3. 切片与索引</a></li>
+<li class="toctree-l2"><a class="reference internal" href="random.html">1.4. 随机数生成</a></li>
 </ul>
 </li>
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-<li class="toctree-l2"><a class="reference internal" href="../ch-pandas/dataframe-groupby.html">分组汇总</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../ch-pandas/dataframe-merge-concat.html">多表操作</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../ch-pandas/dataframe-pivot-melt.html">数据透视</a></li>
+<li class="toctree-l1 has-children"><a class="reference internal" href="../ch-pandas/index.html">2. pandas</a><input class="toctree-checkbox" id="toctree-checkbox-2" name="toctree-checkbox-2" type="checkbox"/><label class="toctree-toggle" for="toctree-checkbox-2"><i class="fa-solid fa-chevron-down"></i></label><ul>
+<li class="toctree-l2"><a class="reference internal" href="../ch-pandas/pandas-intro.html">2.1. pandas 简介</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../ch-pandas/series-dataframe.html">2.2. Series 与 DataFrame</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../ch-pandas/dataframe-slicing.html">2.3. 数据切片</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../ch-pandas/data-preprocessing.html">2.4. 数据处理</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../ch-pandas/dataframe-groupby.html">2.5. 分组汇总</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../ch-pandas/dataframe-merge-concat.html">2.6. 多表操作</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../ch-pandas/dataframe-pivot-melt.html">2.7. 数据透视</a></li>
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 </li>
 </ul>
@@ -415,7 +415,7 @@ <h2> Contents </h2>
                 <article class="bd-article" role="main">
                   
   <section class="tex2jax_ignore mathjax_ignore" id="ndarray">
-<h1>ndarray<a class="headerlink" href="#ndarray" title="Permalink to this heading">#</a></h1>
+<h1><span class="section-number">1.2. </span>ndarray<a class="headerlink" href="#ndarray" title="Permalink to this heading">#</a></h1>
 <p>NumPy 最核心的数据结构是多维数组（N-dimensional Array）： <code class="docutils literal notranslate"><span class="pre">ndarray</span></code>。 <code class="docutils literal notranslate"><span class="pre">ndarray</span></code> 是由同一数据类型的数据组成的数组列表。</p>
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       <i class="fa-solid fa-angle-left"></i>
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-        <p class="prev-next-title">NumPy 简介</p>
+        <p class="prev-next-title"><span class="section-number">1.1. </span>NumPy 简介</p>
       </div>
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@@ -938,7 +938,7 @@ <h2>ndarray 与 Python 列表的转换<a class="headerlink" href="#ndarray-pytho
        title="next page">
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         <p class="prev-next-subtitle">next</p>
-        <p class="prev-next-title">切片与索引</p>
+        <p class="prev-next-title"><span class="section-number">1.3. </span>切片与索引</p>
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diff --git a/docs/ch-numpy/numpy-intro.html b/docs/ch-numpy/numpy-intro.html
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-    <title>NumPy 简介 &#8212; Python 数据科学实战</title>
+    <title>1.1. NumPy 简介 &#8212; Python 数据科学实战</title>
   
   
   
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-    <link rel="next" title="ndarray" href="ndarray.html" />
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@@ -169,21 +169,21 @@
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-<li class="toctree-l2"><a class="reference internal" href="random.html">随机数生成</a></li>
+<li class="toctree-l1 current active has-children"><a class="reference internal" href="index.html">1. NumPy</a><input checked="" class="toctree-checkbox" id="toctree-checkbox-1" name="toctree-checkbox-1" type="checkbox"/><label class="toctree-toggle" for="toctree-checkbox-1"><i class="fa-solid fa-chevron-down"></i></label><ul class="current">
+<li class="toctree-l2 current active"><a class="current reference internal" href="#">1.1. NumPy 简介</a></li>
+<li class="toctree-l2"><a class="reference internal" href="ndarray.html">1.2. ndarray</a></li>
+<li class="toctree-l2"><a class="reference internal" href="ndarray-slicing-index.html">1.3. 切片与索引</a></li>
+<li class="toctree-l2"><a class="reference internal" href="random.html">1.4. 随机数生成</a></li>
 </ul>
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-<li class="toctree-l2"><a class="reference internal" href="../ch-pandas/data-preprocessing.html">数据处理</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../ch-pandas/dataframe-groupby.html">分组汇总</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../ch-pandas/dataframe-merge-concat.html">多表操作</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../ch-pandas/dataframe-pivot-melt.html">数据透视</a></li>
+<li class="toctree-l1 has-children"><a class="reference internal" href="../ch-pandas/index.html">2. pandas</a><input class="toctree-checkbox" id="toctree-checkbox-2" name="toctree-checkbox-2" type="checkbox"/><label class="toctree-toggle" for="toctree-checkbox-2"><i class="fa-solid fa-chevron-down"></i></label><ul>
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+<li class="toctree-l2"><a class="reference internal" href="../ch-pandas/series-dataframe.html">2.2. Series 与 DataFrame</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../ch-pandas/dataframe-slicing.html">2.3. 数据切片</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../ch-pandas/data-preprocessing.html">2.4. 数据处理</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../ch-pandas/dataframe-groupby.html">2.5. 分组汇总</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../ch-pandas/dataframe-merge-concat.html">2.6. 多表操作</a></li>
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 </li>
 </ul>
@@ -392,7 +392,7 @@ <h2> Contents </h2>
                 <article class="bd-article" role="main">
                   
   <section class="tex2jax_ignore mathjax_ignore" id="numpy">
-<h1>NumPy 简介<a class="headerlink" href="#numpy" title="Permalink to this heading">#</a></h1>
+<h1><span class="section-number">1.1. </span>NumPy 简介<a class="headerlink" href="#numpy" title="Permalink to this heading">#</a></h1>
 <p>Python 语言其实并不是为科学计算而设计的，到了 2000 年左右，Python 在科学计算领域变得越来越受欢迎，但缺乏一个高效的数组处理工具。Python 的列表（list）虽然灵活，但在处理大型数据集时性能不佳。</p>
 <p>NumPy 并不是第一个 Python 科学计算库，它的前身有 Numeric、Numarray 等，并借鉴 Fortran、MATLAB、和 S 语言了优点。经过了一系列的演化发展，Travis Oliphant 在 2005 年创建了 NumPy 项目，并在 2006 年发布了 NumPy 1.0。NumPy 的目标是提供高性能的多维数组对象，以及用于数组操作的丰富函数库。NumPy 引入了 <code class="docutils literal notranslate"><span class="pre">ndarray</span></code> 这一核心数据结构。</p>
 <p>自从 NumPy 项目创建以来，它已经成为 Python 科学计算生态系统中的核心组件。许多其他科学计算和数据分析库，如 SciPy、pandas 和 Matplotlib，都构建在 NumPy 之上。</p>
@@ -441,7 +441,7 @@ <h2>安装 NumPy<a class="headerlink" href="#id1" title="Permalink to this headi
       <i class="fa-solid fa-angle-left"></i>
       <div class="prev-next-info">
         <p class="prev-next-subtitle">previous</p>
-        <p class="prev-next-title">NumPy</p>
+        <p class="prev-next-title"><span class="section-number">1. </span>NumPy</p>
       </div>
     </a>
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@@ -449,7 +449,7 @@ <h2>安装 NumPy<a class="headerlink" href="#id1" title="Permalink to this headi
        title="next page">
       <div class="prev-next-info">
         <p class="prev-next-subtitle">next</p>
-        <p class="prev-next-title">ndarray</p>
+        <p class="prev-next-title"><span class="section-number">1.2. </span>ndarray</p>
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     </a>
diff --git a/docs/ch-numpy/random.html b/docs/ch-numpy/random.html
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-    <title>随机数生成 &#8212; Python 数据科学实战</title>
+    <title>1.4. 随机数生成 &#8212; Python 数据科学实战</title>
   
   
   
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-    <link rel="prev" title="切片与索引" href="ndarray-slicing-index.html" />
+    <link rel="next" title="2. pandas" href="../ch-pandas/index.html" />
+    <link rel="prev" title="1.3. 切片与索引" href="ndarray-slicing-index.html" />
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@@ -171,21 +171,21 @@
         </ul>
         <p aria-level="2" class="caption" role="heading"><span class="caption-text">数据处理与计算</span></p>
 <ul class="current nav bd-sidenav">
-<li class="toctree-l1 current active has-children"><a class="reference internal" href="index.html">NumPy</a><input checked="" class="toctree-checkbox" id="toctree-checkbox-1" name="toctree-checkbox-1" type="checkbox"/><label class="toctree-toggle" for="toctree-checkbox-1"><i class="fa-solid fa-chevron-down"></i></label><ul class="current">
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-<li class="toctree-l2 current active"><a class="current reference internal" href="#">随机数生成</a></li>
+<li class="toctree-l1 current active has-children"><a class="reference internal" href="index.html">1. NumPy</a><input checked="" class="toctree-checkbox" id="toctree-checkbox-1" name="toctree-checkbox-1" type="checkbox"/><label class="toctree-toggle" for="toctree-checkbox-1"><i class="fa-solid fa-chevron-down"></i></label><ul class="current">
+<li class="toctree-l2"><a class="reference internal" href="numpy-intro.html">1.1. NumPy 简介</a></li>
+<li class="toctree-l2"><a class="reference internal" href="ndarray.html">1.2. ndarray</a></li>
+<li class="toctree-l2"><a class="reference internal" href="ndarray-slicing-index.html">1.3. 切片与索引</a></li>
+<li class="toctree-l2 current active"><a class="current reference internal" href="#">1.4. 随机数生成</a></li>
 </ul>
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-<li class="toctree-l2"><a class="reference internal" href="../ch-pandas/series-dataframe.html">Series 与 DataFrame</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../ch-pandas/dataframe-slicing.html">数据切片</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../ch-pandas/data-preprocessing.html">数据处理</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../ch-pandas/dataframe-groupby.html">分组汇总</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../ch-pandas/dataframe-merge-concat.html">多表操作</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../ch-pandas/dataframe-pivot-melt.html">数据透视</a></li>
+<li class="toctree-l1 has-children"><a class="reference internal" href="../ch-pandas/index.html">2. pandas</a><input class="toctree-checkbox" id="toctree-checkbox-2" name="toctree-checkbox-2" type="checkbox"/><label class="toctree-toggle" for="toctree-checkbox-2"><i class="fa-solid fa-chevron-down"></i></label><ul>
+<li class="toctree-l2"><a class="reference internal" href="../ch-pandas/pandas-intro.html">2.1. pandas 简介</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../ch-pandas/series-dataframe.html">2.2. Series 与 DataFrame</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../ch-pandas/dataframe-slicing.html">2.3. 数据切片</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../ch-pandas/data-preprocessing.html">2.4. 数据处理</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../ch-pandas/dataframe-groupby.html">2.5. 分组汇总</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../ch-pandas/dataframe-merge-concat.html">2.6. 多表操作</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../ch-pandas/dataframe-pivot-melt.html">2.7. 数据透视</a></li>
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 </li>
 </ul>
@@ -401,7 +401,7 @@ <h2> Contents </h2>
                 <article class="bd-article" role="main">
                   
   <section class="tex2jax_ignore mathjax_ignore" id="id1">
-<h1>随机数生成<a class="headerlink" href="#id1" title="Permalink to this heading">#</a></h1>
+<h1><span class="section-number">1.4. </span>随机数生成<a class="headerlink" href="#id1" title="Permalink to this heading">#</a></h1>
 <p><code class="docutils literal notranslate"><span class="pre">numpy.random</span></code> 模块用于生成随机数。</p>
 <div class="cell tag_hide-cell docutils container">
 <details class="hide above-input">
@@ -600,7 +600,7 @@ <h2>排列<a class="headerlink" href="#id7" title="Permalink to this heading">#<
       <i class="fa-solid fa-angle-left"></i>
       <div class="prev-next-info">
         <p class="prev-next-subtitle">previous</p>
-        <p class="prev-next-title">切片与索引</p>
+        <p class="prev-next-title"><span class="section-number">1.3. </span>切片与索引</p>
       </div>
     </a>
     <a class="right-next"
@@ -608,7 +608,7 @@ <h2>排列<a class="headerlink" href="#id7" title="Permalink to this heading">#<
        title="next page">
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         <p class="prev-next-subtitle">next</p>
-        <p class="prev-next-title">pandas</p>
+        <p class="prev-next-title"><span class="section-number">2. </span>pandas</p>
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-    <title>数据处理 &#8212; Python 数据科学实战</title>
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-    <link rel="next" title="分组汇总" href="dataframe-groupby.html" />
-    <link rel="prev" title="数据切片" href="dataframe-slicing.html" />
+    <link rel="next" title="2.5. 分组汇总" href="dataframe-groupby.html" />
+    <link rel="prev" title="2.3. 数据切片" href="dataframe-slicing.html" />
   <meta name="viewport" content="width=device-width, initial-scale=1"/>
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@@ -169,21 +169,21 @@
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 <ul class="current nav bd-sidenav">
-<li class="toctree-l1 has-children"><a class="reference internal" href="../ch-numpy/index.html">NumPy</a><input class="toctree-checkbox" id="toctree-checkbox-1" name="toctree-checkbox-1" type="checkbox"/><label class="toctree-toggle" for="toctree-checkbox-1"><i class="fa-solid fa-chevron-down"></i></label><ul>
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-<li class="toctree-l2"><a class="reference internal" href="../ch-numpy/random.html">随机数生成</a></li>
+<li class="toctree-l1 has-children"><a class="reference internal" href="../ch-numpy/index.html">1. NumPy</a><input class="toctree-checkbox" id="toctree-checkbox-1" name="toctree-checkbox-1" type="checkbox"/><label class="toctree-toggle" for="toctree-checkbox-1"><i class="fa-solid fa-chevron-down"></i></label><ul>
+<li class="toctree-l2"><a class="reference internal" href="../ch-numpy/numpy-intro.html">1.1. NumPy 简介</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../ch-numpy/ndarray.html">1.2. ndarray</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../ch-numpy/ndarray-slicing-index.html">1.3. 切片与索引</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../ch-numpy/random.html">1.4. 随机数生成</a></li>
 </ul>
 </li>
-<li class="toctree-l1 current active has-children"><a class="reference internal" href="index.html">pandas</a><input checked="" class="toctree-checkbox" id="toctree-checkbox-2" name="toctree-checkbox-2" type="checkbox"/><label class="toctree-toggle" for="toctree-checkbox-2"><i class="fa-solid fa-chevron-down"></i></label><ul class="current">
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-<li class="toctree-l2"><a class="reference internal" href="series-dataframe.html">Series 与 DataFrame</a></li>
-<li class="toctree-l2"><a class="reference internal" href="dataframe-slicing.html">数据切片</a></li>
-<li class="toctree-l2 current active"><a class="current reference internal" href="#">数据处理</a></li>
-<li class="toctree-l2"><a class="reference internal" href="dataframe-groupby.html">分组汇总</a></li>
-<li class="toctree-l2"><a class="reference internal" href="dataframe-merge-concat.html">多表操作</a></li>
-<li class="toctree-l2"><a class="reference internal" href="dataframe-pivot-melt.html">数据透视</a></li>
+<li class="toctree-l1 current active has-children"><a class="reference internal" href="index.html">2. pandas</a><input checked="" class="toctree-checkbox" id="toctree-checkbox-2" name="toctree-checkbox-2" type="checkbox"/><label class="toctree-toggle" for="toctree-checkbox-2"><i class="fa-solid fa-chevron-down"></i></label><ul class="current">
+<li class="toctree-l2"><a class="reference internal" href="pandas-intro.html">2.1. pandas 简介</a></li>
+<li class="toctree-l2"><a class="reference internal" href="series-dataframe.html">2.2. Series 与 DataFrame</a></li>
+<li class="toctree-l2"><a class="reference internal" href="dataframe-slicing.html">2.3. 数据切片</a></li>
+<li class="toctree-l2 current active"><a class="current reference internal" href="#">2.4. 数据处理</a></li>
+<li class="toctree-l2"><a class="reference internal" href="dataframe-groupby.html">2.5. 分组汇总</a></li>
+<li class="toctree-l2"><a class="reference internal" href="dataframe-merge-concat.html">2.6. 多表操作</a></li>
+<li class="toctree-l2"><a class="reference internal" href="dataframe-pivot-melt.html">2.7. 数据透视</a></li>
 </ul>
 </li>
 </ul>
@@ -396,7 +396,7 @@ <h2> Contents </h2>
                 <article class="bd-article" role="main">
                   
   <section class="tex2jax_ignore mathjax_ignore" id="id1">
-<h1>数据处理<a class="headerlink" href="#id1" title="Permalink to this heading">#</a></h1>
+<h1><span class="section-number">2.4. </span>数据处理<a class="headerlink" href="#id1" title="Permalink to this heading">#</a></h1>
 <p>数据处理工作包括处理重复值、缺失值和异常值，生成新的列或者行等。</p>
 <div class="cell tag_hide_code tag_hide-cell docutils container">
 <details class="hide above-input">
@@ -3064,7 +3064,7 @@ <h2>数据排序<a class="headerlink" href="#id4" title="Permalink to this headi
       <i class="fa-solid fa-angle-left"></i>
       <div class="prev-next-info">
         <p class="prev-next-subtitle">previous</p>
-        <p class="prev-next-title">数据切片</p>
+        <p class="prev-next-title"><span class="section-number">2.3. </span>数据切片</p>
       </div>
     </a>
     <a class="right-next"
@@ -3072,7 +3072,7 @@ <h2>数据排序<a class="headerlink" href="#id4" title="Permalink to this headi
        title="next page">
       <div class="prev-next-info">
         <p class="prev-next-subtitle">next</p>
-        <p class="prev-next-title">分组汇总</p>
+        <p class="prev-next-title"><span class="section-number">2.5. </span>分组汇总</p>
       </div>
       <i class="fa-solid fa-angle-right"></i>
     </a>
diff --git a/docs/ch-pandas/dataframe-groupby.html b/docs/ch-pandas/dataframe-groupby.html
index 4b4a26e..da836ee 100644
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+++ b/docs/ch-pandas/dataframe-groupby.html
@@ -9,7 +9,7 @@
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     <meta name="viewport" content="width=device-width, initial-scale=1.0" /><meta name="generator" content="Docutils 0.18.1: http://docutils.sourceforge.net/" />
 
-    <title>分组汇总 &#8212; Python 数据科学实战</title>
+    <title>2.5. 分组汇总 &#8212; Python 数据科学实战</title>
   
   
   
@@ -65,8 +65,8 @@
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     <link rel="index" title="Index" href="../genindex.html" />
     <link rel="search" title="Search" href="../search.html" />
-    <link rel="next" title="多表操作" href="dataframe-merge-concat.html" />
-    <link rel="prev" title="数据处理" href="data-preprocessing.html" />
+    <link rel="next" title="2.6. 多表操作" href="dataframe-merge-concat.html" />
+    <link rel="prev" title="2.4. 数据处理" href="data-preprocessing.html" />
   <meta name="viewport" content="width=device-width, initial-scale=1"/>
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@@ -169,21 +169,21 @@
         </ul>
         <p aria-level="2" class="caption" role="heading"><span class="caption-text">数据处理与计算</span></p>
 <ul class="current nav bd-sidenav">
-<li class="toctree-l1 has-children"><a class="reference internal" href="../ch-numpy/index.html">NumPy</a><input class="toctree-checkbox" id="toctree-checkbox-1" name="toctree-checkbox-1" type="checkbox"/><label class="toctree-toggle" for="toctree-checkbox-1"><i class="fa-solid fa-chevron-down"></i></label><ul>
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-<li class="toctree-l2"><a class="reference internal" href="../ch-numpy/ndarray.html">ndarray</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../ch-numpy/ndarray-slicing-index.html">切片与索引</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../ch-numpy/random.html">随机数生成</a></li>
+<li class="toctree-l1 has-children"><a class="reference internal" href="../ch-numpy/index.html">1. NumPy</a><input class="toctree-checkbox" id="toctree-checkbox-1" name="toctree-checkbox-1" type="checkbox"/><label class="toctree-toggle" for="toctree-checkbox-1"><i class="fa-solid fa-chevron-down"></i></label><ul>
+<li class="toctree-l2"><a class="reference internal" href="../ch-numpy/numpy-intro.html">1.1. NumPy 简介</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../ch-numpy/ndarray.html">1.2. ndarray</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../ch-numpy/ndarray-slicing-index.html">1.3. 切片与索引</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../ch-numpy/random.html">1.4. 随机数生成</a></li>
 </ul>
 </li>
-<li class="toctree-l1 current active has-children"><a class="reference internal" href="index.html">pandas</a><input checked="" class="toctree-checkbox" id="toctree-checkbox-2" name="toctree-checkbox-2" type="checkbox"/><label class="toctree-toggle" for="toctree-checkbox-2"><i class="fa-solid fa-chevron-down"></i></label><ul class="current">
-<li class="toctree-l2"><a class="reference internal" href="pandas-intro.html">pandas 简介</a></li>
-<li class="toctree-l2"><a class="reference internal" href="series-dataframe.html">Series 与 DataFrame</a></li>
-<li class="toctree-l2"><a class="reference internal" href="dataframe-slicing.html">数据切片</a></li>
-<li class="toctree-l2"><a class="reference internal" href="data-preprocessing.html">数据处理</a></li>
-<li class="toctree-l2 current active"><a class="current reference internal" href="#">分组汇总</a></li>
-<li class="toctree-l2"><a class="reference internal" href="dataframe-merge-concat.html">多表操作</a></li>
-<li class="toctree-l2"><a class="reference internal" href="dataframe-pivot-melt.html">数据透视</a></li>
+<li class="toctree-l1 current active has-children"><a class="reference internal" href="index.html">2. pandas</a><input checked="" class="toctree-checkbox" id="toctree-checkbox-2" name="toctree-checkbox-2" type="checkbox"/><label class="toctree-toggle" for="toctree-checkbox-2"><i class="fa-solid fa-chevron-down"></i></label><ul class="current">
+<li class="toctree-l2"><a class="reference internal" href="pandas-intro.html">2.1. pandas 简介</a></li>
+<li class="toctree-l2"><a class="reference internal" href="series-dataframe.html">2.2. Series 与 DataFrame</a></li>
+<li class="toctree-l2"><a class="reference internal" href="dataframe-slicing.html">2.3. 数据切片</a></li>
+<li class="toctree-l2"><a class="reference internal" href="data-preprocessing.html">2.4. 数据处理</a></li>
+<li class="toctree-l2 current active"><a class="current reference internal" href="#">2.5. 分组汇总</a></li>
+<li class="toctree-l2"><a class="reference internal" href="dataframe-merge-concat.html">2.6. 多表操作</a></li>
+<li class="toctree-l2"><a class="reference internal" href="dataframe-pivot-melt.html">2.7. 数据透视</a></li>
 </ul>
 </li>
 </ul>
@@ -395,12 +395,12 @@ <h2> Contents </h2>
                 <article class="bd-article" role="main">
                   
   <section class="tex2jax_ignore mathjax_ignore" id="id1">
-<h1>分组汇总<a class="headerlink" href="#id1" title="Permalink to this heading">#</a></h1>
-<p>实际的数据分析中，经常需要对某一类数据进行统计分析。比如，假如我们拥有全国所有人的身高和体重数据，我们想按照省份分组，统计每个省的平均身高和平均体重，这时候就需要使用分组操作。pandas 提供了 <code class="docutils literal notranslate"><span class="pre">groupby</span></code> 函数进行类似的分组汇总操作。<a class="reference internal" href="#groupby-img"><span class="std std-numref">Fig. 1</span></a> 计算平均身高的分组汇总流程，主要包括两部分：分组与汇总。其中分组阶段将同一类的内容归结到相同的组中；汇总阶段将所关心的数据进行计算，比如求和、求平均等。</p>
+<h1><span class="section-number">2.5. </span>分组汇总<a class="headerlink" href="#id1" title="Permalink to this heading">#</a></h1>
+<p>实际的数据分析中，经常需要对某一类数据进行统计分析。比如，假如我们拥有全国所有人的身高和体重数据，我们想按照省份分组，统计每个省的平均身高和平均体重，这时候就需要使用分组操作。pandas 提供了 <code class="docutils literal notranslate"><span class="pre">groupby</span></code> 函数进行类似的分组汇总操作。<a class="reference internal" href="#groupby-img"><span class="std std-numref">图 2.1</span></a> 计算平均身高的分组汇总流程，主要包括两部分：分组与汇总。其中分组阶段将同一类的内容归结到相同的组中；汇总阶段将所关心的数据进行计算，比如求和、求平均等。</p>
 <p>按哪些字段进行分组，这些字段又被成为 ** 分组变量 **。对其他字段进行汇总，其他汇总字段被成为 ** 汇总变量 **。对汇总变量进行计算，被称为 ** 汇总统计量 **。</p>
 <figure class="align-default" id="groupby-img">
 <img alt="../_images/groupby.svg" src="../_images/groupby.svg" /><figcaption>
-<p><span class="caption-number">Fig. 1 </span><span class="caption-text">分组与汇总</span><a class="headerlink" href="#groupby-img" title="Permalink to this image">#</a></p>
+<p><span class="caption-number">图 2.1 </span><span class="caption-text">分组与汇总</span><a class="headerlink" href="#groupby-img" title="Permalink to this image">#</a></p>
 </figcaption>
 </figure>
 <div class="cell tag_hide-cell docutils container">
@@ -1223,7 +1223,7 @@ <h2>多重索引<a class="headerlink" href="#id5" title="Permalink to this headi
       <i class="fa-solid fa-angle-left"></i>
       <div class="prev-next-info">
         <p class="prev-next-subtitle">previous</p>
-        <p class="prev-next-title">数据处理</p>
+        <p class="prev-next-title"><span class="section-number">2.4. </span>数据处理</p>
       </div>
     </a>
     <a class="right-next"
@@ -1231,7 +1231,7 @@ <h2>多重索引<a class="headerlink" href="#id5" title="Permalink to this headi
        title="next page">
       <div class="prev-next-info">
         <p class="prev-next-subtitle">next</p>
-        <p class="prev-next-title">多表操作</p>
+        <p class="prev-next-title"><span class="section-number">2.6. </span>多表操作</p>
       </div>
       <i class="fa-solid fa-angle-right"></i>
     </a>
diff --git a/docs/ch-pandas/dataframe-merge-concat.html b/docs/ch-pandas/dataframe-merge-concat.html
index e45b891..81410c5 100644
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+++ b/docs/ch-pandas/dataframe-merge-concat.html
@@ -9,7 +9,7 @@
     <meta charset="utf-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" /><meta name="generator" content="Docutils 0.18.1: http://docutils.sourceforge.net/" />
 
-    <title>多表操作 &#8212; Python 数据科学实战</title>
+    <title>2.6. 多表操作 &#8212; Python 数据科学实战</title>
   
   
   
@@ -65,8 +65,8 @@
     <script>DOCUMENTATION_OPTIONS.pagename = 'ch-pandas/dataframe-merge-concat';</script>
     <link rel="index" title="Index" href="../genindex.html" />
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-    <link rel="next" title="数据透视" href="dataframe-pivot-melt.html" />
-    <link rel="prev" title="分组汇总" href="dataframe-groupby.html" />
+    <link rel="next" title="2.7. 数据透视" href="dataframe-pivot-melt.html" />
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   <meta name="viewport" content="width=device-width, initial-scale=1"/>
   <meta name="docsearch:language" content="en"/>
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@@ -169,21 +169,21 @@
         </ul>
         <p aria-level="2" class="caption" role="heading"><span class="caption-text">数据处理与计算</span></p>
 <ul class="current nav bd-sidenav">
-<li class="toctree-l1 has-children"><a class="reference internal" href="../ch-numpy/index.html">NumPy</a><input class="toctree-checkbox" id="toctree-checkbox-1" name="toctree-checkbox-1" type="checkbox"/><label class="toctree-toggle" for="toctree-checkbox-1"><i class="fa-solid fa-chevron-down"></i></label><ul>
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-<li class="toctree-l2"><a class="reference internal" href="../ch-numpy/ndarray.html">ndarray</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../ch-numpy/ndarray-slicing-index.html">切片与索引</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../ch-numpy/random.html">随机数生成</a></li>
+<li class="toctree-l1 has-children"><a class="reference internal" href="../ch-numpy/index.html">1. NumPy</a><input class="toctree-checkbox" id="toctree-checkbox-1" name="toctree-checkbox-1" type="checkbox"/><label class="toctree-toggle" for="toctree-checkbox-1"><i class="fa-solid fa-chevron-down"></i></label><ul>
+<li class="toctree-l2"><a class="reference internal" href="../ch-numpy/numpy-intro.html">1.1. NumPy 简介</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../ch-numpy/ndarray.html">1.2. ndarray</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../ch-numpy/ndarray-slicing-index.html">1.3. 切片与索引</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../ch-numpy/random.html">1.4. 随机数生成</a></li>
 </ul>
 </li>
-<li class="toctree-l1 current active has-children"><a class="reference internal" href="index.html">pandas</a><input checked="" class="toctree-checkbox" id="toctree-checkbox-2" name="toctree-checkbox-2" type="checkbox"/><label class="toctree-toggle" for="toctree-checkbox-2"><i class="fa-solid fa-chevron-down"></i></label><ul class="current">
-<li class="toctree-l2"><a class="reference internal" href="pandas-intro.html">pandas 简介</a></li>
-<li class="toctree-l2"><a class="reference internal" href="series-dataframe.html">Series 与 DataFrame</a></li>
-<li class="toctree-l2"><a class="reference internal" href="dataframe-slicing.html">数据切片</a></li>
-<li class="toctree-l2"><a class="reference internal" href="data-preprocessing.html">数据处理</a></li>
-<li class="toctree-l2"><a class="reference internal" href="dataframe-groupby.html">分组汇总</a></li>
-<li class="toctree-l2 current active"><a class="current reference internal" href="#">多表操作</a></li>
-<li class="toctree-l2"><a class="reference internal" href="dataframe-pivot-melt.html">数据透视</a></li>
+<li class="toctree-l1 current active has-children"><a class="reference internal" href="index.html">2. pandas</a><input checked="" class="toctree-checkbox" id="toctree-checkbox-2" name="toctree-checkbox-2" type="checkbox"/><label class="toctree-toggle" for="toctree-checkbox-2"><i class="fa-solid fa-chevron-down"></i></label><ul class="current">
+<li class="toctree-l2"><a class="reference internal" href="pandas-intro.html">2.1. pandas 简介</a></li>
+<li class="toctree-l2"><a class="reference internal" href="series-dataframe.html">2.2. Series 与 DataFrame</a></li>
+<li class="toctree-l2"><a class="reference internal" href="dataframe-slicing.html">2.3. 数据切片</a></li>
+<li class="toctree-l2"><a class="reference internal" href="data-preprocessing.html">2.4. 数据处理</a></li>
+<li class="toctree-l2"><a class="reference internal" href="dataframe-groupby.html">2.5. 分组汇总</a></li>
+<li class="toctree-l2 current active"><a class="current reference internal" href="#">2.6. 多表操作</a></li>
+<li class="toctree-l2"><a class="reference internal" href="dataframe-pivot-melt.html">2.7. 数据透视</a></li>
 </ul>
 </li>
 </ul>
@@ -398,14 +398,14 @@ <h2> Contents </h2>
                 <article class="bd-article" role="main">
                   
   <section class="tex2jax_ignore mathjax_ignore" id="id1">
-<h1>多表操作<a class="headerlink" href="#id1" title="Permalink to this heading">#</a></h1>
+<h1><span class="section-number">2.6. </span>多表操作<a class="headerlink" href="#id1" title="Permalink to this heading">#</a></h1>
 <p>之前的操作主要在单个 <code class="docutils literal notranslate"><span class="pre">DataFrame</span></code> ，实际上，我们经常需要对多个 <code class="docutils literal notranslate"><span class="pre">DataFrame</span></code> 联合起来进行分析。pandas 提供了多 <code class="docutils literal notranslate"><span class="pre">DataFrame</span></code> 之间的合并和连接的操作，分别是 <code class="docutils literal notranslate"><span class="pre">merge()</span></code> 和 <code class="docutils literal notranslate"><span class="pre">concat()</span></code> 函数。比如，我们可以将两个 <code class="docutils literal notranslate"><span class="pre">DataFrame</span></code> 合并成一个，且保留所有的列。</p>
 <section id="merge">
 <h2>merge<a class="headerlink" href="#merge" title="Permalink to this heading">#</a></h2>
 <p>pandas 的 <code class="docutils literal notranslate"><span class="pre">merge</span></code> 操作可以合并两个 <code class="docutils literal notranslate"><span class="pre">DataFrame</span></code>（或者称为表） ，类似于 SQL 中的 JOIN 操作。 我们可以想象成：一个大表被拆分成两个小表，两个小表都包含一些同样的数据。现在我们需要把两个小表合并，生成一个大表，大表包含了两个小表的字段。</p>
 <figure class="align-default" id="merge-img">
 <img alt="../_images/merge.svg" src="../_images/merge.svg" /><figcaption>
-<p><span class="caption-number">Fig. 2 </span><span class="caption-text">对两个 DataFrame 进行 merge 操作</span><a class="headerlink" href="#merge-img" title="Permalink to this image">#</a></p>
+<p><span class="caption-number">图 2.2 </span><span class="caption-text">对两个 DataFrame 进行 merge 操作</span><a class="headerlink" href="#merge-img" title="Permalink to this image">#</a></p>
 </figcaption>
 </figure>
 <div class="cell docutils container">
@@ -1403,7 +1403,7 @@ <h2>案例：学生成绩<a class="headerlink" href="#id4" title="Permalink to t
       <i class="fa-solid fa-angle-left"></i>
       <div class="prev-next-info">
         <p class="prev-next-subtitle">previous</p>
-        <p class="prev-next-title">分组汇总</p>
+        <p class="prev-next-title"><span class="section-number">2.5. </span>分组汇总</p>
       </div>
     </a>
     <a class="right-next"
@@ -1411,7 +1411,7 @@ <h2>案例：学生成绩<a class="headerlink" href="#id4" title="Permalink to t
        title="next page">
       <div class="prev-next-info">
         <p class="prev-next-subtitle">next</p>
-        <p class="prev-next-title">数据透视</p>
+        <p class="prev-next-title"><span class="section-number">2.7. </span>数据透视</p>
       </div>
       <i class="fa-solid fa-angle-right"></i>
     </a>
diff --git a/docs/ch-pandas/dataframe-pivot-melt.html b/docs/ch-pandas/dataframe-pivot-melt.html
index a08c948..d86df05 100644
--- a/docs/ch-pandas/dataframe-pivot-melt.html
+++ b/docs/ch-pandas/dataframe-pivot-melt.html
@@ -9,7 +9,7 @@
     <meta charset="utf-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" /><meta name="generator" content="Docutils 0.18.1: http://docutils.sourceforge.net/" />
 
-    <title>数据透视 &#8212; Python 数据科学实战</title>
+    <title>2.7. 数据透视 &#8212; Python 数据科学实战</title>
   
   
   
@@ -65,7 +65,7 @@
     <script>DOCUMENTATION_OPTIONS.pagename = 'ch-pandas/dataframe-pivot-melt';</script>
     <link rel="index" title="Index" href="../genindex.html" />
     <link rel="search" title="Search" href="../search.html" />
-    <link rel="prev" title="多表操作" href="dataframe-merge-concat.html" />
+    <link rel="prev" title="2.6. 多表操作" href="dataframe-merge-concat.html" />
   <meta name="viewport" content="width=device-width, initial-scale=1"/>
   <meta name="docsearch:language" content="en"/>
   </head>
@@ -168,21 +168,21 @@
         </ul>
         <p aria-level="2" class="caption" role="heading"><span class="caption-text">数据处理与计算</span></p>
 <ul class="current nav bd-sidenav">
-<li class="toctree-l1 has-children"><a class="reference internal" href="../ch-numpy/index.html">NumPy</a><input class="toctree-checkbox" id="toctree-checkbox-1" name="toctree-checkbox-1" type="checkbox"/><label class="toctree-toggle" for="toctree-checkbox-1"><i class="fa-solid fa-chevron-down"></i></label><ul>
-<li class="toctree-l2"><a class="reference internal" href="../ch-numpy/numpy-intro.html">NumPy 简介</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../ch-numpy/ndarray.html">ndarray</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../ch-numpy/ndarray-slicing-index.html">切片与索引</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../ch-numpy/random.html">随机数生成</a></li>
+<li class="toctree-l1 has-children"><a class="reference internal" href="../ch-numpy/index.html">1. NumPy</a><input class="toctree-checkbox" id="toctree-checkbox-1" name="toctree-checkbox-1" type="checkbox"/><label class="toctree-toggle" for="toctree-checkbox-1"><i class="fa-solid fa-chevron-down"></i></label><ul>
+<li class="toctree-l2"><a class="reference internal" href="../ch-numpy/numpy-intro.html">1.1. NumPy 简介</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../ch-numpy/ndarray.html">1.2. ndarray</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../ch-numpy/ndarray-slicing-index.html">1.3. 切片与索引</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../ch-numpy/random.html">1.4. 随机数生成</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="data-preprocessing.html">数据处理</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="dataframe-merge-concat.html">多表操作</a></li>
-<li class="toctree-l2 current active"><a class="current reference internal" href="#">数据透视</a></li>
+<li class="toctree-l1 current active has-children"><a class="reference internal" href="index.html">2. pandas</a><input checked="" class="toctree-checkbox" id="toctree-checkbox-2" name="toctree-checkbox-2" type="checkbox"/><label class="toctree-toggle" for="toctree-checkbox-2"><i class="fa-solid fa-chevron-down"></i></label><ul class="current">
+<li class="toctree-l2"><a class="reference internal" href="pandas-intro.html">2.1. pandas 简介</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="dataframe-slicing.html">2.3. 数据切片</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="dataframe-groupby.html">2.5. 分组汇总</a></li>
+<li class="toctree-l2"><a class="reference internal" href="dataframe-merge-concat.html">2.6. 多表操作</a></li>
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   <section class="tex2jax_ignore mathjax_ignore" id="id1">
-<h1>数据透视<a class="headerlink" href="#id1" title="Permalink to this heading">#</a></h1>
+<h1><span class="section-number">2.7. </span>数据透视<a class="headerlink" href="#id1" title="Permalink to this heading">#</a></h1>
 <p><code class="docutils literal notranslate"><span class="pre">pivot()</span></code> 和 <code class="docutils literal notranslate"><span class="pre">melt()</span></code> 是一对互逆的操作，能提供类似 Excel 数据透视表这样的功能。</p>
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 <h2>pivot<a class="headerlink" href="#pivot" title="Permalink to this heading">#</a></h2>
@@ -2030,7 +2030,7 @@ <h2>melt<a class="headerlink" href="#melt" title="Permalink to this heading">#</
 </ul>
 <figure class="align-default" id="melt-img">
 <img alt="../_images/melt.svg" src="../_images/melt.svg" /><figcaption>
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+<p><span class="caption-number">图 2.3 </span><span class="caption-text">melt(): 数据融化</span><a class="headerlink" href="#melt-img" title="Permalink to this image">#</a></p>
 </figcaption>
 </figure>
 </section>
@@ -2072,7 +2072,7 @@ <h2>melt<a class="headerlink" href="#melt" title="Permalink to this heading">#</
       <i class="fa-solid fa-angle-left"></i>
       <div class="prev-next-info">
         <p class="prev-next-subtitle">previous</p>
-        <p class="prev-next-title">多表操作</p>
+        <p class="prev-next-title"><span class="section-number">2.6. </span>多表操作</p>
       </div>
     </a>
 </div>
diff --git a/docs/ch-pandas/dataframe-slicing.html b/docs/ch-pandas/dataframe-slicing.html
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-    <title>数据切片 &#8212; Python 数据科学实战</title>
+    <title>2.3. 数据切片 &#8212; Python 数据科学实战</title>
   
   
   
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-    <link rel="next" title="数据处理" href="data-preprocessing.html" />
-    <link rel="prev" title="Series 与 DataFrame" href="series-dataframe.html" />
+    <link rel="next" title="2.4. 数据处理" href="data-preprocessing.html" />
+    <link rel="prev" title="2.2. Series 与 DataFrame" href="series-dataframe.html" />
   <meta name="viewport" content="width=device-width, initial-scale=1"/>
   <meta name="docsearch:language" content="en"/>
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@@ -169,21 +169,21 @@
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         <p aria-level="2" class="caption" role="heading"><span class="caption-text">数据处理与计算</span></p>
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-<li class="toctree-l1 has-children"><a class="reference internal" href="../ch-numpy/index.html">NumPy</a><input class="toctree-checkbox" id="toctree-checkbox-1" name="toctree-checkbox-1" type="checkbox"/><label class="toctree-toggle" for="toctree-checkbox-1"><i class="fa-solid fa-chevron-down"></i></label><ul>
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-<li class="toctree-l2"><a class="reference internal" href="../ch-numpy/random.html">随机数生成</a></li>
+<li class="toctree-l1 has-children"><a class="reference internal" href="../ch-numpy/index.html">1. NumPy</a><input class="toctree-checkbox" id="toctree-checkbox-1" name="toctree-checkbox-1" type="checkbox"/><label class="toctree-toggle" for="toctree-checkbox-1"><i class="fa-solid fa-chevron-down"></i></label><ul>
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+<li class="toctree-l2"><a class="reference internal" href="../ch-numpy/ndarray.html">1.2. ndarray</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../ch-numpy/ndarray-slicing-index.html">1.3. 切片与索引</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../ch-numpy/random.html">1.4. 随机数生成</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="dataframe-groupby.html">分组汇总</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="dataframe-pivot-melt.html">数据透视</a></li>
+<li class="toctree-l1 current active has-children"><a class="reference internal" href="index.html">2. pandas</a><input checked="" class="toctree-checkbox" id="toctree-checkbox-2" name="toctree-checkbox-2" type="checkbox"/><label class="toctree-toggle" for="toctree-checkbox-2"><i class="fa-solid fa-chevron-down"></i></label><ul class="current">
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+<li class="toctree-l2"><a class="reference internal" href="series-dataframe.html">2.2. Series 与 DataFrame</a></li>
+<li class="toctree-l2 current active"><a class="current reference internal" href="#">2.3. 数据切片</a></li>
+<li class="toctree-l2"><a class="reference internal" href="data-preprocessing.html">2.4. 数据处理</a></li>
+<li class="toctree-l2"><a class="reference internal" href="dataframe-groupby.html">2.5. 分组汇总</a></li>
+<li class="toctree-l2"><a class="reference internal" href="dataframe-merge-concat.html">2.6. 多表操作</a></li>
+<li class="toctree-l2"><a class="reference internal" href="dataframe-pivot-melt.html">2.7. 数据透视</a></li>
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 </li>
 </ul>
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   <section class="tex2jax_ignore mathjax_ignore" id="id1">
-<h1>数据切片<a class="headerlink" href="#id1" title="Permalink to this heading">#</a></h1>
+<h1><span class="section-number">2.3. </span>数据切片<a class="headerlink" href="#id1" title="Permalink to this heading">#</a></h1>
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 <details class="hide above-input">
@@ -2307,7 +2307,7 @@ <h3>query<a class="headerlink" href="#query" title="Permalink to this heading">#
       <i class="fa-solid fa-angle-left"></i>
       <div class="prev-next-info">
         <p class="prev-next-subtitle">previous</p>
-        <p class="prev-next-title">Series 与 DataFrame</p>
+        <p class="prev-next-title"><span class="section-number">2.2. </span>Series 与 DataFrame</p>
       </div>
     </a>
     <a class="right-next"
@@ -2315,7 +2315,7 @@ <h3>query<a class="headerlink" href="#query" title="Permalink to this heading">#
        title="next page">
       <div class="prev-next-info">
         <p class="prev-next-subtitle">next</p>
-        <p class="prev-next-title">数据处理</p>
+        <p class="prev-next-title"><span class="section-number">2.4. </span>数据处理</p>
       </div>
       <i class="fa-solid fa-angle-right"></i>
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diff --git a/docs/ch-pandas/index.html b/docs/ch-pandas/index.html
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-    <title>pandas &#8212; Python 数据科学实战</title>
+    <title>2. pandas &#8212; Python 数据科学实战</title>
   
   
   
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+    <link rel="next" title="2.1. pandas 简介" href="pandas-intro.html" />
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   <meta name="viewport" content="width=device-width, initial-scale=1"/>
   <meta name="docsearch:language" content="en"/>
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@@ -169,21 +169,21 @@
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-<li class="toctree-l1 has-children"><a class="reference internal" href="../ch-numpy/index.html">NumPy</a><input class="toctree-checkbox" id="toctree-checkbox-1" name="toctree-checkbox-1" type="checkbox"/><label class="toctree-toggle" for="toctree-checkbox-1"><i class="fa-solid fa-chevron-down"></i></label><ul>
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-<li class="toctree-l2"><a class="reference internal" href="../ch-numpy/random.html">随机数生成</a></li>
+<li class="toctree-l1 has-children"><a class="reference internal" href="../ch-numpy/index.html">1. NumPy</a><input class="toctree-checkbox" id="toctree-checkbox-1" name="toctree-checkbox-1" type="checkbox"/><label class="toctree-toggle" for="toctree-checkbox-1"><i class="fa-solid fa-chevron-down"></i></label><ul>
+<li class="toctree-l2"><a class="reference internal" href="../ch-numpy/numpy-intro.html">1.1. NumPy 简介</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../ch-numpy/ndarray.html">1.2. ndarray</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../ch-numpy/ndarray-slicing-index.html">1.3. 切片与索引</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../ch-numpy/random.html">1.4. 随机数生成</a></li>
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-<li class="toctree-l1 current active has-children"><a class="current reference internal" href="#">pandas</a><input checked="" class="toctree-checkbox" id="toctree-checkbox-2" name="toctree-checkbox-2" type="checkbox"/><label class="toctree-toggle" for="toctree-checkbox-2"><i class="fa-solid fa-chevron-down"></i></label><ul>
-<li class="toctree-l2"><a class="reference internal" href="pandas-intro.html">pandas 简介</a></li>
-<li class="toctree-l2"><a class="reference internal" href="series-dataframe.html">Series 与 DataFrame</a></li>
-<li class="toctree-l2"><a class="reference internal" href="dataframe-slicing.html">数据切片</a></li>
-<li class="toctree-l2"><a class="reference internal" href="data-preprocessing.html">数据处理</a></li>
-<li class="toctree-l2"><a class="reference internal" href="dataframe-groupby.html">分组汇总</a></li>
-<li class="toctree-l2"><a class="reference internal" href="dataframe-merge-concat.html">多表操作</a></li>
-<li class="toctree-l2"><a class="reference internal" href="dataframe-pivot-melt.html">数据透视</a></li>
+<li class="toctree-l1 current active has-children"><a class="current reference internal" href="#">2. pandas</a><input checked="" class="toctree-checkbox" id="toctree-checkbox-2" name="toctree-checkbox-2" type="checkbox"/><label class="toctree-toggle" for="toctree-checkbox-2"><i class="fa-solid fa-chevron-down"></i></label><ul>
+<li class="toctree-l2"><a class="reference internal" href="pandas-intro.html">2.1. pandas 简介</a></li>
+<li class="toctree-l2"><a class="reference internal" href="series-dataframe.html">2.2. Series 与 DataFrame</a></li>
+<li class="toctree-l2"><a class="reference internal" href="dataframe-slicing.html">2.3. 数据切片</a></li>
+<li class="toctree-l2"><a class="reference internal" href="data-preprocessing.html">2.4. 数据处理</a></li>
+<li class="toctree-l2"><a class="reference internal" href="dataframe-groupby.html">2.5. 分组汇总</a></li>
+<li class="toctree-l2"><a class="reference internal" href="dataframe-merge-concat.html">2.6. 多表操作</a></li>
+<li class="toctree-l2"><a class="reference internal" href="dataframe-pivot-melt.html">2.7. 数据透视</a></li>
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 </li>
 </ul>
@@ -382,17 +382,17 @@ <h1>pandas</h1>
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   <section class="tex2jax_ignore mathjax_ignore" id="pandas">
-<h1>pandas<a class="headerlink" href="#pandas" title="Permalink to this heading">#</a></h1>
+<h1><span class="section-number">2. </span>pandas<a class="headerlink" href="#pandas" title="Permalink to this heading">#</a></h1>
 <p>本节主要讲解如何使用 pandas 进行表格数据处理。</p>
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-<li class="toctree-l1"><a class="reference internal" href="dataframe-slicing.html">数据切片</a></li>
-<li class="toctree-l1"><a class="reference internal" href="data-preprocessing.html">数据处理</a></li>
-<li class="toctree-l1"><a class="reference internal" href="dataframe-groupby.html">分组汇总</a></li>
-<li class="toctree-l1"><a class="reference internal" href="dataframe-merge-concat.html">多表操作</a></li>
-<li class="toctree-l1"><a class="reference internal" href="dataframe-pivot-melt.html">数据透视</a></li>
+<li class="toctree-l1"><a class="reference internal" href="pandas-intro.html">2.1. pandas 简介</a></li>
+<li class="toctree-l1"><a class="reference internal" href="series-dataframe.html">2.2. Series 与 DataFrame</a></li>
+<li class="toctree-l1"><a class="reference internal" href="dataframe-slicing.html">2.3. 数据切片</a></li>
+<li class="toctree-l1"><a class="reference internal" href="data-preprocessing.html">2.4. 数据处理</a></li>
+<li class="toctree-l1"><a class="reference internal" href="dataframe-groupby.html">2.5. 分组汇总</a></li>
+<li class="toctree-l1"><a class="reference internal" href="dataframe-merge-concat.html">2.6. 多表操作</a></li>
+<li class="toctree-l1"><a class="reference internal" href="dataframe-pivot-melt.html">2.7. 数据透视</a></li>
 </ul>
 </div>
 </section>
@@ -433,7 +433,7 @@ <h1>pandas<a class="headerlink" href="#pandas" title="Permalink to this heading"
       <i class="fa-solid fa-angle-left"></i>
       <div class="prev-next-info">
         <p class="prev-next-subtitle">previous</p>
-        <p class="prev-next-title">随机数生成</p>
+        <p class="prev-next-title"><span class="section-number">1.4. </span>随机数生成</p>
       </div>
     </a>
     <a class="right-next"
@@ -441,7 +441,7 @@ <h1>pandas<a class="headerlink" href="#pandas" title="Permalink to this heading"
        title="next page">
       <div class="prev-next-info">
         <p class="prev-next-subtitle">next</p>
-        <p class="prev-next-title">pandas 简介</p>
+        <p class="prev-next-title"><span class="section-number">2.1. </span>pandas 简介</p>
       </div>
       <i class="fa-solid fa-angle-right"></i>
     </a>
diff --git a/docs/ch-pandas/pandas-intro.html b/docs/ch-pandas/pandas-intro.html
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-    <title>pandas 简介 &#8212; Python 数据科学实战</title>
+    <title>2.1. pandas 简介 &#8212; Python 数据科学实战</title>
   
   
   
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-    <link rel="next" title="Series 与 DataFrame" href="series-dataframe.html" />
-    <link rel="prev" title="pandas" href="index.html" />
+    <link rel="next" title="2.2. Series 与 DataFrame" href="series-dataframe.html" />
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@@ -169,21 +169,21 @@
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-        <p class="prev-next-title">pandas</p>
+        <p class="prev-next-title"><span class="section-number">2. </span>pandas</p>
       </div>
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         <p class="prev-next-subtitle">next</p>
-        <p class="prev-next-title">Series 与 DataFrame</p>
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+    <link rel="next" title="2.3. 数据切片" href="dataframe-slicing.html" />
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-<li class="toctree-l2"><a class="reference internal" href="../ch-numpy/random.html">随机数生成</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="dataframe-groupby.html">2.5. 分组汇总</a></li>
+<li class="toctree-l2"><a class="reference internal" href="dataframe-merge-concat.html">2.6. 多表操作</a></li>
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@@ -400,7 +400,7 @@ <h2> Contents </h2>
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-<h1>Series 与 DataFrame<a class="headerlink" href="#series-dataframe" title="Permalink to this heading">#</a></h1>
+<h1><span class="section-number">2.2. </span>Series 与 DataFrame<a class="headerlink" href="#series-dataframe" title="Permalink to this heading">#</a></h1>
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       <div class="prev-next-info">
         <p class="prev-next-subtitle">previous</p>
-        <p class="prev-next-title">pandas 简介</p>
+        <p class="prev-next-title"><span class="section-number">2.1. </span>pandas 简介</p>
       </div>
     </a>
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@@ -1201,7 +1201,7 @@ <h3>查看数据<a class="headerlink" href="#id2" title="Permalink to this headi
        title="next page">
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         <p class="prev-next-subtitle">next</p>
-        <p class="prev-next-title">数据切片</p>
+        <p class="prev-next-title"><span class="section-number">2.3. </span>数据切片</p>
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       <i class="fa-solid fa-angle-right"></i>
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diff --git a/docs/genindex.html b/docs/genindex.html
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-<li class="toctree-l2"><a class="reference internal" href="ch-numpy/random.html">随机数生成</a></li>
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+    <link rel="next" title="1. NumPy" href="ch-numpy/index.html" />
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-<li class="toctree-l2"><a class="reference internal" href="ch-numpy/random.html">随机数生成</a></li>
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@@ -499,7 +499,7 @@ <h2>赞赏与支持<a class="headerlink" href="#id2" title="Permalink to this he
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diff --git a/docs/search.html b/docs/search.html
index fab05f5..3468221 100644
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\ No newline at end of file