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 <pre><code><span><span class="va">swap</span> <span class="op">=</span> <span class="va">x</span>  <span class="co">#  x = 1.0 y = 3.0 swap = 1.0</span></span>
 <span><span class="va">x</span> <span class="op">=</span> <span class="va">y</span>     <span class="co">#  x = 3.0 y = 3.0 swap = 1.0</span></span>
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@@ -1299,7 +1299,7 @@ <h3 class="callout-title">Can you slice integers?</h3>
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 <p>Numbers are not stored in the written representation, so they can’t
 be treated like strings.</p>
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 <ol style="list-style-type: decimal">
 <li>It will slice the string, starting at the <code>low</code> index and
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 <p>It is a floating-point number (often abbreviated “float”).</p>
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 <p>It is a float: integers are automatically converted to floats as
 necessary.</p>
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 <p>The <a href="https://docs.python.org/3/library/datetime.html" class="external-link">datetime
 module</a> seems like it could help you.</p>
@@ -3048,7 +3048,7 @@ <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"><
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   <h3 class="accordion-header" id="headingSpoiler1">  <div class="note-square"><i aria-hidden="true" class="callout-icon" data-feather="eye"></i></div> Is there something special about that date in library history? </h3>
 </button>
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 <p>According to <a href="https://www.wccls.org/news/brief-history-library-catalog" class="external-link">Washington
 County Cooperative Library Services</a>: “1971, August 26 – Ohio
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@@ -3571,7 +3571,7 @@ <h3 class="callout-title">Key Points</h3>
 </div>
 </section></section><section id="aio-looping-data-sets"><p>Content from <a href="looping-data-sets.html">Looping Over Data Sets</a></p>
 <hr>
-<p>Last updated on 2024-06-17 |
+<p>Last updated on 2024-10-29 |
 
         <a href="https://github.com/librarycarpentry/lc-python-intro/edit/main/episodes/looping-data-sets.md" class="external-link">Edit this page <i aria-hidden="true" data-feather="edit"></i></a></p>
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-<pre class="sourceCode python" tabindex="0"><code class="sourceCode python"><span id="cb1-1"><a href="#cb1-1" tabindex="-1"></a><span class="cf">for</span> filename <span class="kw">in</span> [<span class="st">'data/2011_circ.csv'</span>, <span class="st">'data/2012_circ.csv'</span>]:</span>
-<span id="cb1-2"><a href="#cb1-2" tabindex="-1"></a>  data <span class="op">=</span> pd.read_csv(filename)</span>
-<span id="cb1-3"><a href="#cb1-3" tabindex="-1"></a>  <span class="bu">print</span>(filename, data[<span class="st">'ytd'</span>].<span class="bu">max</span>())</span></code></pre>
+<pre class="sourceCode python" tabindex="0"><code class="sourceCode python"><span id="cb1-1"><a href="#cb1-1" tabindex="-1"></a><span class="im">import</span> pandas <span class="im">as</span> pd</span>
+<span id="cb1-2"><a href="#cb1-2" tabindex="-1"></a><span class="cf">for</span> filename <span class="kw">in</span> [<span class="st">'data/2011_circ.csv'</span>, <span class="st">'data/2012_circ.csv'</span>]:</span>
+<span id="cb1-3"><a href="#cb1-3" tabindex="-1"></a>  data <span class="op">=</span> pd.read_csv(filename)</span>
+<span id="cb1-4"><a href="#cb1-4" tabindex="-1"></a>  <span class="bu">print</span>(filename, data[<span class="st">'ytd'</span>].<span class="bu">max</span>())</span></code></pre>
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 <p>Only item 1 is matched by the wildcard expression
 <code>data/*circ.csv</code>.</p>
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 <p>Global variables:</p>
 <ul>
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@@ -768,7 +768,7 @@ <h3 class="callout-title">Use a string index in a loop</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution3" aria-expanded="false" aria-controls="collapseSolution3">
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@@ -816,7 +816,7 @@ <h3 class="callout-title">Subtract a list of values in a loop</h3>
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diff --git a/index.html b/index.html
index d668d530..0d1e2c86 100644
--- a/index.html
+++ b/index.html
@@ -474,7 +474,7 @@ <h3 class="tab-header" id="nav-tab-heading-1-3">
 </button>
 </div>
 </nav><div id="nav-tabContent-1" class="tab-content">
-<div id="nav-tabpanel-1-1" class="tab-pane show active" role="tabpanel" aria-labelledby="nav-tab-1-1">
+<div id="nav-tabpanel-1-1" class="tab-pane show active" aria-labelledby="nav-tab-1-1" role="tabpanel">
 <p><a href="https://www.youtube.com/watch?v=xxQ0mzZ8UvA" class="external-link">Watch a video
 tutorial for Windows</a>.</p>
 <ol style="list-style-type: decimal"><li>Open <a href="https://www.anaconda.com/download/" class="external-link">anaconda.com/download</a> with
@@ -486,7 +486,7 @@ <h3 class="tab-header" id="nav-tab-heading-1-3">
 defaults for installation except make sure to check <em>Add Anaconda to
 my PATH environment variable</em>.</li>
 </ol></div>
-<div id="nav-tabpanel-1-2" class="tab-pane" role="tabpanel" aria-labelledby="nav-tab-1-2">
+<div id="nav-tabpanel-1-2" class="tab-pane" aria-labelledby="nav-tab-1-2" role="tabpanel">
 <p><a href="https://www.youtube.com/watch?v=TcSAln46u9U" class="external-link">Watch a video
 tutorial for Mac</a>.</p>
 <ol style="list-style-type: decimal"><li>Open <a href="https://www.anaconda.com/download/" class="external-link">anaconda.com/download</a> with
@@ -496,7 +496,7 @@ <h3 class="tab-header" id="nav-tab-heading-1-3">
 <li>Install Python 3 by running the Anaconda Installer using all of the
 defaults for installation.</li>
 </ol></div>
-<div id="nav-tabpanel-1-3" class="tab-pane" role="tabpanel" aria-labelledby="nav-tab-1-3">
+<div id="nav-tabpanel-1-3" class="tab-pane" aria-labelledby="nav-tab-1-3" role="tabpanel">
 <p>Note that the following installation steps require you to work from
 the shell. If you aren’t comfortable doing the installation yourself
 stop here and request help from the workshop organizers.</p>
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 </button>
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 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution2" aria-expanded="false" aria-controls="collapseSolution2">
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+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
 <div class="accordion-body">
 <pre><code><span><span class="va">swap</span> <span class="op">=</span> <span class="va">x</span>  <span class="co">#  x = 1.0 y = 3.0 swap = 1.0</span></span>
 <span><span class="va">x</span> <span class="op">=</span> <span class="va">y</span>     <span class="co">#  x = 3.0 y = 3.0 swap = 1.0</span></span>
@@ -1281,7 +1281,7 @@ <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"><
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 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
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@@ -1318,7 +1318,7 @@ <h3 class="callout-title">Can you slice integers?</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution4" aria-expanded="false" aria-controls="collapseSolution4">
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 <div class="accordion-body">
 <p>Numbers are not stored in the written representation, so they can’t
 be treated like strings.</p>
@@ -1376,7 +1376,7 @@ <h3 class="code-label">OUTPUT<i aria-hidden="true" data-feather="chevron-left"><
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 <ol style="list-style-type: decimal">
 <li>It will slice the string, starting at the <code>low</code> index and
@@ -1408,7 +1408,7 @@ <h3 class="callout-title">Fractions</h3>
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 <p>It is a floating-point number (often abbreviated “float”).</p>
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 <p>It is a float: integers are automatically converted to floats as
 necessary.</p>
@@ -1699,7 +1699,7 @@ <h3 class="callout-title">Lists: Length and Indexing</h3>
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 <p>The <a href="https://docs.python.org/3/library/datetime.html" class="external-link">datetime
 module</a> seems like it could help you.</p>
@@ -3070,7 +3070,7 @@ <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"><
 <button class="accordion-button spoiler-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSpoiler1" aria-expanded="false" aria-controls="collapseSpoiler1">
   <h3 class="accordion-header" id="headingSpoiler1">  <div class="note-square"><i aria-hidden="true" class="callout-icon" data-feather="eye"></i></div> Is there something special about that date in library history? </h3>
 </button>
-<div id="collapseSpoiler1" class="accordion-collapse collapse" data-bs-parent="#accordionSpoiler1" aria-labelledby="headingSpoiler1">
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 <div class="accordion-body">
 <p>According to <a href="https://www.wccls.org/news/brief-history-library-catalog" class="external-link">Washington
 County Cooperative Library Services</a>: “1971, August 26 – Ohio
@@ -3393,7 +3393,7 @@ <h3 class="callout-title">Loop through a list</h3>
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@@ -3544,7 +3544,7 @@ <h3 class="callout-title">Subtract a list of values in a loop</h3>
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@@ -3594,7 +3594,7 @@ <h3 class="callout-title">Key Points</h3>
 </div>
 </section></section><section id="aio-looping-data-sets"><p>Content from <a href="looping-data-sets.html">Looping Over Data Sets</a></p>
 <hr>
-<p>Last updated on 2024-06-17 |
+<p>Last updated on 2024-10-29 |
 
         <a href="https://github.com/librarycarpentry/lc-python-intro/edit/main/episodes/looping-data-sets.md" class="external-link">Edit this page <i aria-hidden="true" data-feather="edit"></i></a></p>
 <p>Estimated time: <i aria-hidden="true" data-feather="clock"></i> 20 minutes</p>
@@ -3643,9 +3643,10 @@ <h3 class="card-title">Objectives</h3>
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-<pre class="sourceCode python" tabindex="0"><code class="sourceCode python"><span id="cb1-1"><a href="#cb1-1" tabindex="-1"></a><span class="cf">for</span> filename <span class="kw">in</span> [<span class="st">'data/2011_circ.csv'</span>, <span class="st">'data/2012_circ.csv'</span>]:</span>
-<span id="cb1-2"><a href="#cb1-2" tabindex="-1"></a>  data <span class="op">=</span> pd.read_csv(filename)</span>
-<span id="cb1-3"><a href="#cb1-3" tabindex="-1"></a>  <span class="bu">print</span>(filename, data[<span class="st">'ytd'</span>].<span class="bu">max</span>())</span></code></pre>
+<pre class="sourceCode python" tabindex="0"><code class="sourceCode python"><span id="cb1-1"><a href="#cb1-1" tabindex="-1"></a><span class="im">import</span> pandas <span class="im">as</span> pd</span>
+<span id="cb1-2"><a href="#cb1-2" tabindex="-1"></a><span class="cf">for</span> filename <span class="kw">in</span> [<span class="st">'data/2011_circ.csv'</span>, <span class="st">'data/2012_circ.csv'</span>]:</span>
+<span id="cb1-3"><a href="#cb1-3" tabindex="-1"></a>  data <span class="op">=</span> pd.read_csv(filename)</span>
+<span id="cb1-4"><a href="#cb1-4" tabindex="-1"></a>  <span class="bu">print</span>(filename, data[<span class="st">'ytd'</span>].<span class="bu">max</span>())</span></code></pre>
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@@ -3896,7 +3897,7 @@ <h3 class="callout-title">Determining Matches</h3>
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 <p>Only item 1 is matched by the wildcard expression
 <code>data/*circ.csv</code>.</p>
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@@ -5847,7 +5848,7 @@ <h3 class="callout-title">Create a function</h3>
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-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
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@@ -5893,7 +5894,7 @@ <h3 class="callout-title">Conditional statements within functions</h3>
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@@ -5960,7 +5961,7 @@ <h3 class="code-label">OUTPUT<i aria-hidden="true" data-feather="chevron-left"><
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution3" aria-expanded="false" aria-controls="collapseSolution3">
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 <div class="accordion-body">
 <p>Global variables:</p>
 <ul>
@@ -6002,7 +6003,7 @@ <h3 class="callout-title">CSVs to Pandas function</h3>
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diff --git a/instructor/for-loops.html b/instructor/for-loops.html
index 71c24cbc..20a4afb3 100644
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+++ b/instructor/for-loops.html
@@ -669,7 +669,7 @@ <h3 class="callout-title">Loop through a list</h3>
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@@ -725,7 +725,7 @@ <h3 class="callout-title">Use range() in a loop</h3>
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@@ -770,7 +770,7 @@ <h3 class="callout-title">Use a string index in a loop</h3>
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diff --git a/instructor/index.html b/instructor/index.html
index ff8a1e75..daebc683 100644
--- a/instructor/index.html
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   Major lesson update: June 17, 2024
   </h3>
 </button>
-<div id="collapseInstructor1" class="accordion-collapse collapse" data-bs-parent="#accordionInstructor1" aria-labelledby="headingInstructor1">
+<div id="collapseInstructor1" class="accordion-collapse collapse" aria-labelledby="headingInstructor1" data-bs-parent="#accordionInstructor1">
 <div class="accordion-body">
 <p>The Python Intro for Libraries lesson had a major redesign on June
 17, 2024. This new Python lesson features a different dataset (of
@@ -635,7 +635,7 @@ <h3 class="tab-header" id="nav-tab-heading-1-3">
 </button>
 </div>
 </nav><div id="nav-tabContent-1" class="tab-content">
-<div id="nav-tabpanel-1-1" class="tab-pane show active" role="tabpanel" aria-labelledby="nav-tab-1-1">
+<div id="nav-tabpanel-1-1" class="tab-pane show active" aria-labelledby="nav-tab-1-1" role="tabpanel">
 <p><a href="https://www.youtube.com/watch?v=xxQ0mzZ8UvA" class="external-link">Watch a video
 tutorial for Windows</a>.</p>
 <ol style="list-style-type: decimal"><li>Open <a href="https://www.anaconda.com/download/" class="external-link">anaconda.com/download</a> with
@@ -647,7 +647,7 @@ <h3 class="tab-header" id="nav-tab-heading-1-3">
 defaults for installation except make sure to check <em>Add Anaconda to
 my PATH environment variable</em>.</li>
 </ol></div>
-<div id="nav-tabpanel-1-2" class="tab-pane" role="tabpanel" aria-labelledby="nav-tab-1-2">
+<div id="nav-tabpanel-1-2" class="tab-pane" aria-labelledby="nav-tab-1-2" role="tabpanel">
 <p><a href="https://www.youtube.com/watch?v=TcSAln46u9U" class="external-link">Watch a video
 tutorial for Mac</a>.</p>
 <ol style="list-style-type: decimal"><li>Open <a href="https://www.anaconda.com/download/" class="external-link">anaconda.com/download</a> with
@@ -657,7 +657,7 @@ <h3 class="tab-header" id="nav-tab-heading-1-3">
 <li>Install Python 3 by running the Anaconda Installer using all of the
 defaults for installation.</li>
 </ol></div>
-<div id="nav-tabpanel-1-3" class="tab-pane" role="tabpanel" aria-labelledby="nav-tab-1-3">
+<div id="nav-tabpanel-1-3" class="tab-pane" aria-labelledby="nav-tab-1-3" role="tabpanel">
 <p>Note that the following installation steps require you to work from
 the shell. If you aren’t comfortable doing the installation yourself
 stop here and request help from the workshop organizers.</p>
diff --git a/instructor/libraries.html b/instructor/libraries.html
index ffd08309..3deac622 100644
--- a/instructor/libraries.html
+++ b/instructor/libraries.html
@@ -1081,7 +1081,7 @@ <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"><
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-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
 <div class="accordion-body">
 <p>The <a href="https://docs.python.org/3/library/datetime.html" class="external-link">datetime
 module</a> seems like it could help you.</p>
@@ -1168,7 +1168,7 @@ <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"><
 <button class="accordion-button spoiler-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSpoiler1" aria-expanded="false" aria-controls="collapseSpoiler1">
   <h3 class="accordion-header" id="headingSpoiler1">  <div class="note-square"><i aria-hidden="true" class="callout-icon" data-feather="eye"></i></div> Is there something special about that date in library history? </h3>
 </button>
-<div id="collapseSpoiler1" class="accordion-collapse collapse" data-bs-parent="#accordionSpoiler1" aria-labelledby="headingSpoiler1">
+<div id="collapseSpoiler1" class="accordion-collapse collapse" aria-labelledby="headingSpoiler1" data-bs-parent="#accordionSpoiler1">
 <div class="accordion-body">
 <p>According to <a href="https://www.wccls.org/news/brief-history-library-catalog" class="external-link">Washington
 County Cooperative Library Services</a>: “1971, August 26 – Ohio
diff --git a/instructor/lists.html b/instructor/lists.html
index 4b710b34..8f8d01fd 100644
--- a/instructor/lists.html
+++ b/instructor/lists.html
@@ -589,7 +589,7 @@ <h3 class="callout-title">Lists: Length and Indexing</h3>
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 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
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 <h3 class="code-label">OUTPUT<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
diff --git a/instructor/looping-data-sets.html b/instructor/looping-data-sets.html
index a10a2e2b..eaa34516 100644
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+++ b/instructor/looping-data-sets.html
@@ -396,7 +396,7 @@ <h2 class="accordion-header" id="flush-headingTwelve">
       </div>
       <hr></nav><main id="main-content" class="main-content"><div class="container lesson-content">
         <h1>Looping Over Data Sets</h1>
-        <p>Last updated on 2024-06-17 |
+        <p>Last updated on 2024-10-29 |
 
         <a href="https://github.com/librarycarpentry/lc-python-intro/edit/main/episodes/looping-data-sets.md" class="external-link">Edit this page <i aria-hidden="true" data-feather="edit"></i></a></p>
 
@@ -446,9 +446,10 @@ <h3 class="card-title">Objectives</h3>
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 </h3>
-<pre class="sourceCode python" tabindex="0"><code class="sourceCode python"><span id="cb1-1"><a href="#cb1-1" tabindex="-1"></a><span class="cf">for</span> filename <span class="kw">in</span> [<span class="st">'data/2011_circ.csv'</span>, <span class="st">'data/2012_circ.csv'</span>]:</span>
-<span id="cb1-2"><a href="#cb1-2" tabindex="-1"></a>  data <span class="op">=</span> pd.read_csv(filename)</span>
-<span id="cb1-3"><a href="#cb1-3" tabindex="-1"></a>  <span class="bu">print</span>(filename, data[<span class="st">'ytd'</span>].<span class="bu">max</span>())</span></code></pre>
+<pre class="sourceCode python" tabindex="0"><code class="sourceCode python"><span id="cb1-1"><a href="#cb1-1" tabindex="-1"></a><span class="im">import</span> pandas <span class="im">as</span> pd</span>
+<span id="cb1-2"><a href="#cb1-2" tabindex="-1"></a><span class="cf">for</span> filename <span class="kw">in</span> [<span class="st">'data/2011_circ.csv'</span>, <span class="st">'data/2012_circ.csv'</span>]:</span>
+<span id="cb1-3"><a href="#cb1-3" tabindex="-1"></a>  data <span class="op">=</span> pd.read_csv(filename)</span>
+<span id="cb1-4"><a href="#cb1-4" tabindex="-1"></a>  <span class="bu">print</span>(filename, data[<span class="st">'ytd'</span>].<span class="bu">max</span>())</span></code></pre>
 </div>
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@@ -686,7 +687,7 @@ <h3 class="callout-title">Determining Matches</h3>
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 </button>
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+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
 <div class="accordion-body">
 <p>Only item 1 is matched by the wildcard expression
 <code>data/*circ.csv</code>.</p>
@@ -720,7 +721,7 @@ <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"><
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 </button>
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@@ -760,7 +761,7 @@ <h3 class="callout-title">Compile CSVs into one DataFrame</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution3" aria-expanded="false" aria-controls="collapseSolution3">
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 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
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@@ -858,7 +859,7 @@ <h3 class="callout-title">Key Points</h3>
   "url": "https://librarycarpentry.github.io/lc-python-intro/instructor/looping-data-sets.html",
   "identifier": "https://librarycarpentry.github.io/lc-python-intro/instructor/looping-data-sets.html",
   "dateCreated": "2018-04-12",
-  "dateModified": "2024-06-17",
+  "dateModified": "2024-10-29",
   "datePublished": "2024-10-29"
 }
 
diff --git a/instructor/variables.html b/instructor/variables.html
index 00024a3f..ba5dfc36 100644
--- a/instructor/variables.html
+++ b/instructor/variables.html
@@ -729,7 +729,7 @@ <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"><
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 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
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@@ -772,7 +772,7 @@ <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"><
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-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
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 <pre><code><span><span class="va">swap</span> <span class="op">=</span> <span class="va">x</span>  <span class="co">#  x = 1.0 y = 3.0 swap = 1.0</span></span>
 <span><span class="va">x</span> <span class="op">=</span> <span class="va">y</span>     <span class="co">#  x = 3.0 y = 3.0 swap = 1.0</span></span>
@@ -809,7 +809,7 @@ <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"><
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 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
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@@ -846,7 +846,7 @@ <h3 class="callout-title">Can you slice integers?</h3>
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   <h4 class="accordion-header" id="headingSolution4"> Show me the solution </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
 <div class="accordion-body">
 <p>Numbers are not stored in the written representation, so they can’t
 be treated like strings.</p>
@@ -902,7 +902,7 @@ <h3 class="code-label">OUTPUT<i aria-hidden="true" data-feather="chevron-left"><
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution5" aria-expanded="false" aria-controls="collapseSolution5">
   <h4 class="accordion-header" id="headingSolution5"> Show me the solution </h4>
 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
+<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
 <div class="accordion-body">
 <ol style="list-style-type: decimal"><li>It will slice the string, starting at the <code>low</code> index and
 stopping at the end of the string.</li>
@@ -932,7 +932,7 @@ <h3 class="callout-title">Fractions</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution6" aria-expanded="false" aria-controls="collapseSolution6">
   <h4 class="accordion-header" id="headingSolution6"> Show me the solution </h4>
 </button>
-<div id="collapseSolution6" class="accordion-collapse collapse" data-bs-parent="#accordionSolution6" aria-labelledby="headingSolution6">
+<div id="collapseSolution6" class="accordion-collapse collapse" aria-labelledby="headingSolution6" data-bs-parent="#accordionSolution6">
 <div class="accordion-body">
 <p>It is a floating-point number (often abbreviated “float”).</p>
 <div class="codewrapper sourceCode" id="cb38">
@@ -965,7 +965,7 @@ <h3 class="callout-title">Automatic Type Conversion</h3>
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   <h4 class="accordion-header" id="headingSolution7"> Show me the solution </h4>
 </button>
-<div id="collapseSolution7" class="accordion-collapse collapse" data-bs-parent="#accordionSolution7" aria-labelledby="headingSolution7">
+<div id="collapseSolution7" class="accordion-collapse collapse" aria-labelledby="headingSolution7" data-bs-parent="#accordionSolution7">
 <div class="accordion-body">
 <p>It is a float: integers are automatically converted to floats as
 necessary.</p>
diff --git a/instructor/writing-functions.html b/instructor/writing-functions.html
index 80d7804a..341f4db5 100644
--- a/instructor/writing-functions.html
+++ b/instructor/writing-functions.html
@@ -698,7 +698,7 @@ <h3 class="callout-title">Create a function</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution1" aria-expanded="false" aria-controls="collapseSolution1">
   <h4 class="accordion-header" id="headingSolution1"> Show me the solution </h4>
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-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
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@@ -742,7 +742,7 @@ <h3 class="callout-title">Conditional statements within functions</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution2" aria-expanded="false" aria-controls="collapseSolution2">
   <h4 class="accordion-header" id="headingSolution2"> Show me the solution </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
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 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -809,7 +809,7 @@ <h3 class="code-label">OUTPUT<i aria-hidden="true" data-feather="chevron-left"><
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution3" aria-expanded="false" aria-controls="collapseSolution3">
   <h4 class="accordion-header" id="headingSolution3"> Show me the solution </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
 <div class="accordion-body">
 <p>Global variables:</p>
 <ul><li>fine_rate</li>
@@ -847,7 +847,7 @@ <h3 class="callout-title">CSVs to Pandas function</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution4" aria-expanded="false" aria-controls="collapseSolution4">
   <h4 class="accordion-header" id="headingSolution4"> Show me the solution </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb28">
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diff --git a/libraries.html b/libraries.html
index 5855f57d..e7c2e6e3 100644
--- a/libraries.html
+++ b/libraries.html
@@ -1079,7 +1079,7 @@ <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"><
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   <h4 class="accordion-header" id="headingSolution1"> Show me the solution </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
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 <div class="codewrapper sourceCode" id="cb21">
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@@ -1135,7 +1135,7 @@ <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"><
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 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
 <div class="accordion-body">
 <p>The <a href="https://docs.python.org/3/library/datetime.html" class="external-link">datetime
 module</a> seems like it could help you.</p>
@@ -1166,7 +1166,7 @@ <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"><
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   <h3 class="accordion-header" id="headingSpoiler1">  <div class="note-square"><i aria-hidden="true" class="callout-icon" data-feather="eye"></i></div> Is there something special about that date in library history? </h3>
 </button>
-<div id="collapseSpoiler1" class="accordion-collapse collapse" data-bs-parent="#accordionSpoiler1" aria-labelledby="headingSpoiler1">
+<div id="collapseSpoiler1" class="accordion-collapse collapse" aria-labelledby="headingSpoiler1" data-bs-parent="#accordionSpoiler1">
 <div class="accordion-body">
 <p>According to <a href="https://www.wccls.org/news/brief-history-library-catalog" class="external-link">Washington
 County Cooperative Library Services</a>: “1971, August 26 – Ohio
diff --git a/lists.html b/lists.html
index 6941954c..b03fb31b 100644
--- a/lists.html
+++ b/lists.html
@@ -587,7 +587,7 @@ <h3 class="callout-title">Lists: Length and Indexing</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution1" aria-expanded="false" aria-controls="collapseSolution1">
   <h4 class="accordion-header" id="headingSolution1"> Show me the solution </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
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-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
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 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
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 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
 <div class="accordion-body">
 <div class="codewrapper">
 <h3 class="code-label">OUTPUT<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
diff --git a/looping-data-sets.html b/looping-data-sets.html
index da932ab7..9b0403b1 100644
--- a/looping-data-sets.html
+++ b/looping-data-sets.html
@@ -396,7 +396,7 @@ <h2 class="accordion-header" id="flush-headingTwelve">
       </div>
       <hr></nav><main id="main-content" class="main-content"><div class="container lesson-content">
         <h1>Looping Over Data Sets</h1>
-        <p>Last updated on 2024-06-17 |
+        <p>Last updated on 2024-10-29 |
 
         <a href="https://github.com/librarycarpentry/lc-python-intro/edit/main/episodes/looping-data-sets.md" class="external-link">Edit this page <i aria-hidden="true" data-feather="edit"></i></a></p>
 
@@ -444,9 +444,10 @@ <h3 class="card-title">Objectives</h3>
 <div class="codewrapper sourceCode" id="cb1">
 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
 </h3>
-<pre class="sourceCode python" tabindex="0"><code class="sourceCode python"><span id="cb1-1"><a href="#cb1-1" tabindex="-1"></a><span class="cf">for</span> filename <span class="kw">in</span> [<span class="st">'data/2011_circ.csv'</span>, <span class="st">'data/2012_circ.csv'</span>]:</span>
-<span id="cb1-2"><a href="#cb1-2" tabindex="-1"></a>  data <span class="op">=</span> pd.read_csv(filename)</span>
-<span id="cb1-3"><a href="#cb1-3" tabindex="-1"></a>  <span class="bu">print</span>(filename, data[<span class="st">'ytd'</span>].<span class="bu">max</span>())</span></code></pre>
+<pre class="sourceCode python" tabindex="0"><code class="sourceCode python"><span id="cb1-1"><a href="#cb1-1" tabindex="-1"></a><span class="im">import</span> pandas <span class="im">as</span> pd</span>
+<span id="cb1-2"><a href="#cb1-2" tabindex="-1"></a><span class="cf">for</span> filename <span class="kw">in</span> [<span class="st">'data/2011_circ.csv'</span>, <span class="st">'data/2012_circ.csv'</span>]:</span>
+<span id="cb1-3"><a href="#cb1-3" tabindex="-1"></a>  data <span class="op">=</span> pd.read_csv(filename)</span>
+<span id="cb1-4"><a href="#cb1-4" tabindex="-1"></a>  <span class="bu">print</span>(filename, data[<span class="st">'ytd'</span>].<span class="bu">max</span>())</span></code></pre>
 </div>
 <div class="codewrapper">
 <h3 class="code-label">OUTPUT<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -684,7 +685,7 @@ <h3 class="callout-title">Determining Matches</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution1" aria-expanded="false" aria-controls="collapseSolution1">
   <h4 class="accordion-header" id="headingSolution1"> Show me the solution </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
 <div class="accordion-body">
 <p>Only item 1 is matched by the wildcard expression
 <code>data/*circ.csv</code>.</p>
@@ -718,7 +719,7 @@ <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"><
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution2" aria-expanded="false" aria-controls="collapseSolution2">
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 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
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 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -758,7 +759,7 @@ <h3 class="callout-title">Compile CSVs into one DataFrame</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution3" aria-expanded="false" aria-controls="collapseSolution3">
   <h4 class="accordion-header" id="headingSolution3"> Show me the solution </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
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 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -856,7 +857,7 @@ <h3 class="callout-title">Key Points</h3>
   "url": "https://librarycarpentry.github.io/lc-python-intro/looping-data-sets.html",
   "identifier": "https://librarycarpentry.github.io/lc-python-intro/looping-data-sets.html",
   "dateCreated": "2018-04-12",
-  "dateModified": "2024-06-17",
+  "dateModified": "2024-10-29",
   "datePublished": "2024-10-29"
 }
 
diff --git a/md5sum.txt b/md5sum.txt
index 04d1b488..fa043799 100644
--- a/md5sum.txt
+++ b/md5sum.txt
@@ -9,7 +9,7 @@
 "episodes/functions.md" "499deb6ac29cdd4a00134176ef890616" "site/built/functions.md" "2024-06-17"
 "episodes/libraries.md" "e1ea10719dd52d371c0a5a2bf03f687b" "site/built/libraries.md" "2024-06-17"
 "episodes/for-loops.md" "a44b90e5f6f451c1659b7f877e0c0c4d" "site/built/for-loops.md" "2024-06-27"
-"episodes/looping-data-sets.md" "56880c06991a04425c2cf8fe52ddbede" "site/built/looping-data-sets.md" "2024-06-17"
+"episodes/looping-data-sets.md" "ff153b594bf9543fa2ed4890c4d3ef71" "site/built/looping-data-sets.md" "2024-10-29"
 "episodes/pandas.md" "5f2461a95e56e8aa3aa6851f12d3d566" "site/built/pandas.md" "2024-06-17"
 "episodes/conditionals.md" "b567ac5270b3dc82c4ed119870a0a890" "site/built/conditionals.md" "2024-06-17"
 "episodes/writing-functions.md" "99171306646b8b63c66a493acef12e63" "site/built/writing-functions.md" "2024-06-17"
diff --git a/pkgdown.yml b/pkgdown.yml
index 01a84eb2..0c071b3f 100644
--- a/pkgdown.yml
+++ b/pkgdown.yml
@@ -2,4 +2,4 @@ pandoc: 3.1.11
 pkgdown: 2.1.1
 pkgdown_sha: ~
 articles: {}
-last_built: 2024-10-29T18:13Z
+last_built: 2024-10-29T18:15Z
diff --git a/variables.html b/variables.html
index 7d5e2199..0224db7d 100644
--- a/variables.html
+++ b/variables.html
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 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
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 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -770,7 +770,7 @@ <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"><
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 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
 <div class="accordion-body">
 <pre><code><span><span class="va">swap</span> <span class="op">=</span> <span class="va">x</span>  <span class="co">#  x = 1.0 y = 3.0 swap = 1.0</span></span>
 <span><span class="va">x</span> <span class="op">=</span> <span class="va">y</span>     <span class="co">#  x = 3.0 y = 3.0 swap = 1.0</span></span>
@@ -807,7 +807,7 @@ <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"><
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 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
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@@ -844,7 +844,7 @@ <h3 class="callout-title">Can you slice integers?</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution4" aria-expanded="false" aria-controls="collapseSolution4">
   <h4 class="accordion-header" id="headingSolution4"> Show me the solution </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
 <div class="accordion-body">
 <p>Numbers are not stored in the written representation, so they can’t
 be treated like strings.</p>
@@ -900,7 +900,7 @@ <h3 class="code-label">OUTPUT<i aria-hidden="true" data-feather="chevron-left"><
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 <ol style="list-style-type: decimal"><li>It will slice the string, starting at the <code>low</code> index and
 stopping at the end of the string.</li>
@@ -930,7 +930,7 @@ <h3 class="callout-title">Fractions</h3>
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 <p>It is a floating-point number (often abbreviated “float”).</p>
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@@ -963,7 +963,7 @@ <h3 class="callout-title">Automatic Type Conversion</h3>
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 <p>It is a float: integers are automatically converted to floats as
 necessary.</p>
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@@ -696,7 +696,7 @@ <h3 class="callout-title">Create a function</h3>
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 <p>Global variables:</p>
 <ul><li>fine_rate</li>
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