Update documentation

Author: khuyentran1401

Chapter2/Chapter2.html

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+    <link rel="stylesheet" type="text/css" href="../_static/mystnb.4510f1fc1dee50b3e5859aac5469c37c29e427902b24a333a5f9fcb2f0b3ac41.css?v=be8a1c11" />
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         <ul class="nav bd-sidenav bd-sidenav__home-link">
             <li class="toctree-l1">
                 <a class="reference internal" href="../README.html">
-                    What Should You Expect From This Book?
+                    Efficient Python Tricks and Tools for Data Scientists
                 </a>
             </li>
         </ul>

Chapter2/pydash.html

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     <link rel="stylesheet" type="text/css" href="../_static/styles/sphinx-book-theme.css?v=eba8b062" />
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+    <link rel="stylesheet" type="text/css" href="../_static/mystnb.4510f1fc1dee50b3e5859aac5469c37c29e427902b24a333a5f9fcb2f0b3ac41.css?v=be8a1c11" />
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@@ -210,7 +210,7 @@
         <ul class="nav bd-sidenav bd-sidenav__home-link">
             <li class="toctree-l1">
                 <a class="reference internal" href="../README.html">
-                    What Should You Expect From This Book?
+                    Efficient Python Tricks and Tools for Data Scientists
                 </a>
             </li>
         </ul>
@@ -634,12 +634,10 @@ <h2> Contents </h2>
 </li>
 <li class="toc-h1 nav-item toc-entry"><a class="reference internal nav-link" href="#work-with-functions">3.10. Work with Functions</a><ul class="visible nav section-nav flex-column">
 <li class="toc-h2 nav-item toc-entry"><a class="reference internal nav-link" href="#execute-a-function-n-times">3.10.1. Execute a Function n Times</a></li>
-<li class="toc-h2 nav-item toc-entry"><a class="reference internal nav-link" href="#chaining">3.10.2. Chaining</a><ul class="nav section-nav flex-column">
-<li class="toc-h3 nav-item toc-entry"><a class="reference internal nav-link" href="#pydashs-methods">3.10.2.1. Pydash’s Methods</a></li>
-<li class="toc-h3 nav-item toc-entry"><a class="reference internal nav-link" href="#customized-methods">3.10.2.2. Customized Methods</a></li>
-<li class="toc-h3 nav-item toc-entry"><a class="reference internal nav-link" href="#planting-a-value">3.10.2.3. Planting a Value</a></li>
-</ul>
-</li>
+<li class="toc-h2 nav-item toc-entry"><a class="reference internal nav-link" href="#chaining">3.10.2. Chaining</a></li>
+<li class="toc-h2 nav-item toc-entry"><a class="reference internal nav-link" href="#pydashs-methods">3.10.3. Pydash’s Methods</a></li>
+<li class="toc-h2 nav-item toc-entry"><a class="reference internal nav-link" href="#customized-methods">3.10.4. Customized Methods</a></li>
+<li class="toc-h2 nav-item toc-entry"><a class="reference internal nav-link" href="#planting-a-value">3.10.5. Planting a Value</a></li>
 </ul>
 </li>
 </ul>
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 </section>
 <section id="chaining">
 <h2><span class="section-number">3.10.2. </span>Chaining<a class="headerlink" href="#chaining" title="Link to this heading">#</a></h2>
+</section>
 <section id="pydashs-methods">
-<h3><span class="section-number">3.10.2.1. </span>Pydash’s Methods<a class="headerlink" href="#pydashs-methods" title="Link to this heading">#</a></h3>
+<h2><span class="section-number">3.10.3. </span>Pydash’s Methods<a class="headerlink" href="#pydashs-methods" title="Link to this heading">#</a></h2>
 <p>Sometimes you might want to apply several methods to an object. Instead of writing several lines of code, can you apply all methods at once?</p>
 <p>That is when method chaining comes in handy. To apply method chaining in an object, use the <code class="docutils literal notranslate"><span class="pre">chain</span></code> method:</p>
 <div class="cell docutils container">
@@ -1195,7 +1194,7 @@ <h3><span class="section-number">3.10.2.1. </span>Pydash’s Methods<a class="he
 <p>This is called <a class="reference external" href="https://www.tutorialspoint.com/functional_programming/functional_programming_lazy_evaluation.htm">lazy evaluation</a>. Lazy evaluation holds the evaluation of an expression until its value is needed, which avoids repeated evaluation.</p>
 </section>
 <section id="customized-methods">
-<h3><span class="section-number">3.10.2.2. </span>Customized Methods<a class="headerlink" href="#customized-methods" title="Link to this heading">#</a></h3>
+<h2><span class="section-number">3.10.4. </span>Customized Methods<a class="headerlink" href="#customized-methods" title="Link to this heading">#</a></h2>
 <p>If you want to use your own methods instead of pydash’s methods, use the <code class="docutils literal notranslate"><span class="pre">map</span></code> method:</p>
 <div class="cell docutils container">
 <div class="cell_input docutils container">
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 </div>
 </section>
 <section id="planting-a-value">
-<h3><span class="section-number">3.10.2.3. </span>Planting a Value<a class="headerlink" href="#planting-a-value" title="Link to this heading">#</a></h3>
+<h2><span class="section-number">3.10.5. </span>Planting a Value<a class="headerlink" href="#planting-a-value" title="Link to this heading">#</a></h2>
 <p>To replace the initial value of a chain with another value, use the <code class="docutils literal notranslate"><span class="pre">plant</span></code> method:</p>
 <div class="cell docutils container">
 <div class="cell_input docutils container">
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 </div>
 <p>Cool! We replace <code class="docutils literal notranslate"><span class="pre">['apple',</span> <span class="pre">'orange',</span> <span class="pre">'grapes']</span></code> with <code class="docutils literal notranslate"><span class="pre">['apple',</span> <span class="pre">'orange']</span></code> while using the same chain!</p>
 </section>
-</section>
 </section>
 
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 </li>
 <li class="toc-h1 nav-item toc-entry"><a class="reference internal nav-link" href="#work-with-functions">3.10. Work with Functions</a><ul class="visible nav section-nav flex-column">
 <li class="toc-h2 nav-item toc-entry"><a class="reference internal nav-link" href="#execute-a-function-n-times">3.10.1. Execute a Function n Times</a></li>
-<li class="toc-h2 nav-item toc-entry"><a class="reference internal nav-link" href="#chaining">3.10.2. Chaining</a><ul class="nav section-nav flex-column">
-<li class="toc-h3 nav-item toc-entry"><a class="reference internal nav-link" href="#pydashs-methods">3.10.2.1. Pydash’s Methods</a></li>
-<li class="toc-h3 nav-item toc-entry"><a class="reference internal nav-link" href="#customized-methods">3.10.2.2. Customized Methods</a></li>
-<li class="toc-h3 nav-item toc-entry"><a class="reference internal nav-link" href="#planting-a-value">3.10.2.3. Planting a Value</a></li>
-</ul>
-</li>
+<li class="toc-h2 nav-item toc-entry"><a class="reference internal nav-link" href="#chaining">3.10.2. Chaining</a></li>
+<li class="toc-h2 nav-item toc-entry"><a class="reference internal nav-link" href="#pydashs-methods">3.10.3. Pydash’s Methods</a></li>
+<li class="toc-h2 nav-item toc-entry"><a class="reference internal nav-link" href="#customized-methods">3.10.4. Customized Methods</a></li>
+<li class="toc-h2 nav-item toc-entry"><a class="reference internal nav-link" href="#planting-a-value">3.10.5. Planting a Value</a></li>
 </ul>
 </li>
 </ul>