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<!DOCTYPE html>
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<head>
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  <title>Lesson — learn-dev</title>
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    <p class="course-card__meta"><a href="course.html">Python for curious minds</a></p>

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            <ol class="lesson-toc__list">
              <li class="lesson-toc__item" data-level="2">
                <a class="lesson-toc__link" aria-current="true"
                   href="#why-lists-matter">Why lists matter</a></li>
              <li class="lesson-toc__item" data-level="2">
                <a class="lesson-toc__link" href="#growing-lists">Growing lists</a></li>
              <li class="lesson-toc__item" data-level="3">
                <a class="lesson-toc__link" href="#append">Appending</a></li>
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        <h1 class="page-title">Lists in five minutes</h1>

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      <!-- Sanitized HTML from MarkdownRenderer; authored "# ..." arrives as h2 (ADR-0014) -->
      <div class="lesson-content">
        <h2 id="why-lists-matter">Why lists matter</h2>
        <p>Lists hold <em>ordered</em> values. Try <code>mylist.append(42)</code>.</p>
        <ul>
          <li>they keep insertion order</li>
          <li>they grow as needed</li>
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          <p class="markdown-alert-title">Note</p>
          <p>Alerts carry a title, an icon, and an accent color per type.</p>
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        <h2 id="growing-lists">Growing lists</h2>
        <p>Lists change size as your data does.</p>
        <h3 id="append">Appending</h3>
        <!-- Code block with highlight.js token spans, as produced client-side -->
        <pre><code class="language-python hljs"><span class="hljs-keyword">def</span> <span class="hljs-title">grow</span>(numbers):
    numbers.append(<span class="hljs-number">4</span>)  <span class="hljs-comment"># lists grow as needed</span>
    <span class="hljs-keyword">return</span> numbers</code></pre>
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          <p>Custom titles are inline-parsed, exactly as on the lesson page.</p>
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