object-oriented-python
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           <div class="body" role="main">
 
   <section id="preface">
-<h1>Preface<a class="headerlink" href="#preface" title="Permalink to this headline">¶</a></h1>
+<h1>Preface<a class="headerlink" href="#preface" title="Link to this heading">¶</a></h1>
 <p>Computers have revolutionised mathematics and the many scientific, engineering,
 and economic fields in which mathematics is applied. In the applications of
 mathematics the role of computation has long been obvious and prominent. Now,
@@ -90,7 +85,7 @@ <h1>Preface<a class="headerlink" href="#preface" title="Permalink to this headli
 need to make effective use of computers in their further studies or working
 careers.</p>
 <section id="what-is-this-book-for">
-<h2>What is this book for?<a class="headerlink" href="#what-is-this-book-for" title="Permalink to this headline">¶</a></h2>
+<h2>What is this book for?<a class="headerlink" href="#what-is-this-book-for" title="Link to this heading">¶</a></h2>
 <p>This book is the result of a significant change in the mathematics curriculum
 at Imperial College London. Rather than assume that students will somehow
 acquire programming skills along the way, we have introduced first and second
@@ -119,7 +114,7 @@ <h2>What is this book for?<a class="headerlink" href="#what-is-this-book-for" ti
 the converse.</p>
 </section>
 <section id="who-is-this-book-for">
-<h2>Who is this book for?<a class="headerlink" href="#who-is-this-book-for" title="Permalink to this headline">¶</a></h2>
+<h2>Who is this book for?<a class="headerlink" href="#who-is-this-book-for" title="Link to this heading">¶</a></h2>
 <p>This book is for anyone with mathematical, scientific, or engineering interests
 who would like to learn to be a more capable programmer. The mathematical
 examples assume that you know how to differentiate functions of one variable,
@@ -142,22 +137,22 @@ <h2>Who is this book for?<a class="headerlink" href="#who-is-this-book-for" titl
 scratch in <a class="reference internal" href="2_programs_in_files.html#programs-files"><span class="std std-numref">Chapter 2</span></a>.</p>
 </section>
 <section id="how-to-use-this-book">
-<h2>How to use this book<a class="headerlink" href="#how-to-use-this-book" title="Permalink to this headline">¶</a></h2>
+<h2>How to use this book<a class="headerlink" href="#how-to-use-this-book" title="Link to this heading">¶</a></h2>
 <p>You can, of course, simply sit down and read this book from cover to cover,
 or dip in to see what it has to say on particular subjects. However,
 reading a book about programming will not teach you to program. For that,
 you need to get your hands dirty writing code and debugging your mistakes.
 The videos and exercises throughout the book are designed to help you do
 this.</p>
 <section id="the-videos">
-<h3>The videos<a class="headerlink" href="#the-videos" title="Permalink to this headline">¶</a></h3>
+<h3>The videos<a class="headerlink" href="#the-videos" title="Link to this heading">¶</a></h3>
 <p>The videos were created to accompany the course at Imperial College London.
 They’re not primarily lecture videos but are instead practical demonstrations
 of the programming concepts being introduced at the relevant point. Usually
 it’s better to watch the video <em>after</em> reading the relevant section.</p>
 </section>
 <section id="the-exercises">
-<h3>The exercises<a class="headerlink" href="#the-exercises" title="Permalink to this headline">¶</a></h3>
+<h3>The exercises<a class="headerlink" href="#the-exercises" title="Link to this heading">¶</a></h3>
 <p>At the end of each chapter are exercises. These usually depend on a skeleton
 code which is available on GitHub. Sometimes you might be asked to complete a
 piece of code while on other occasions you’ll need to write a whole Python
@@ -167,12 +162,12 @@ <h3>The exercises<a class="headerlink" href="#the-exercises" title="Permalink to
 feedback and enable you to know how you are doing. Links to the skeleton code
 for each chapter are provided at:</p>
 <blockquote>
-<div><p><a class="reference external" href="https://object-oriented-python.github.io/edition2/exercises.html">https://object-oriented-python.github.io/edition2/exercises.html</a></p>
+<div><p><a class="reference external" href="https://object-oriented-python.github.io/edition3/exercises.html">https://object-oriented-python.github.io/edition3/exercises.html</a></p>
 </div></blockquote>
 </section>
 </section>
 <section id="conventions-employed">
-<h2>Conventions employed<a class="headerlink" href="#conventions-employed" title="Permalink to this headline">¶</a></h2>
+<h2>Conventions employed<a class="headerlink" href="#conventions-employed" title="Link to this heading">¶</a></h2>
 <p>Each chapter starts by introducing new material, supported by the videos and
 exercises. At the end of each chapter is a glossary containing many of the key
 concepts introduced in that chapter. Terms to be found in a glossary are given
@@ -196,15 +191,15 @@ <h2>Conventions employed<a class="headerlink" href="#conventions-employed" title
 </div>
 </section>
 <section id="teaching-this-course-elsewhere">
-<h2>Teaching this course elsewhere<a class="headerlink" href="#teaching-this-course-elsewhere" title="Permalink to this headline">¶</a></h2>
+<h2>Teaching this course elsewhere<a class="headerlink" href="#teaching-this-course-elsewhere" title="Link to this heading">¶</a></h2>
 <p>The course of which this book forms the text has been given to master’s
 students at the University of Oxford, as well as to undergraduate students at
 Imperial College London. Instructors are welcome to use this material to teach
 elsewhere, and are encouraged to contact the author for assistance with access
 to materials.</p>
 </section>
 <section id="acknowledgements">
-<h2>Acknowledgements<a class="headerlink" href="#acknowledgements" title="Permalink to this headline">¶</a></h2>
+<h2>Acknowledgements<a class="headerlink" href="#acknowledgements" title="Link to this heading">¶</a></h2>
 <p>The course Principles of Programming, and the notes on which this book is
 based, were first delivered in spring 2020, when university teaching was
 completely online during the COVID pandemic. I’d like to thank teaching fellow
@@ -228,15 +223,21 @@ <h2>Acknowledgements<a class="headerlink" href="#acknowledgements" title="Permal
 single source. Thanks are due to its authors as well as those of the underlying
 LaTeX and TeX typesetting systems.</p>
 </section>
-<section id="changes-in-the-second-edition">
-<h2>Changes in the second edition<a class="headerlink" href="#changes-in-the-second-edition" title="Permalink to this headline">¶</a></h2>
-<p>The second edition is a minor update correcting numerous small issues that have
-been pointed out over the last year. A more substantive change is that the
-explanation of packaging in <a class="reference internal" href="2_programs_in_files.html#programs-files"><span class="std std-numref">Section 2</span></a> has been modernised to use
+<section id="changes-in-the-second-and-third-editions">
+<h2>Changes in the second and third editions<a class="headerlink" href="#changes-in-the-second-and-third-editions" title="Link to this heading">¶</a></h2>
+<p>The second edition was a minor update correcting numerous small issues that have
+been pointed out over the last year. A more substantive change was that the
+explanation of packaging in <a class="reference internal" href="2_programs_in_files.html#programs-files"><span class="std std-numref">Section 2</span></a> was modernised to use
 <code class="file docutils literal notranslate"><span class="pre">pyproject.toml</span></code> in place of <code class="xref py py-obj docutils literal notranslate"><span class="pre">setup.py</span></code>.
-<a class="reference internal" href="3_objects.html#assignment-and-instantiation"><span class="std std-numref">Section 3.5</span></a> has been added in response to confusion
+<a class="reference internal" href="3_objects.html#assignment-and-instantiation"><span class="std std-numref">Section 3.5</span></a> was added in response to confusion
 expressed by a number of students about the distinction between instantiating
 new objects and assigning new variable names to existing objects.</p>
+<p>The third edition is similarly a minor update. In documents Visual Studio Code
+workspaces in <a class="reference internal" href="2_programs_in_files.html#workspaces"><span class="std std-numref">Section 2.2.1</span></a>, and the Flake8 extension in
+<a class="reference internal" href="4_style.html#flake8-extension"><span class="std std-numref">Section 4.2.2</span></a>. Together, these provide correctly integrated code
+linting. It also consistently uses <code class="xref py py-obj docutils literal notranslate"><span class="pre">python</span> <span class="pre">-m</span></code> to invoke tools such as <code class="xref py py-obj docutils literal notranslate"><span class="pre">pip</span></code>,
+<a class="reference external" href="https://docs.pytest.org/en/latest/index.html#module-pytest" title="(in pytest v0.1.dev171+gb73b4c4)"><code class="xref py py-obj docutils literal notranslate"><span class="pre">pytest</span></code></a> and <code class="xref py py-obj docutils literal notranslate"><span class="pre">flake8</span></code>. This is less error-prone for students. The description
+of <a class="reference external" href="https://docs.python.org/3/reference/compound_stmts.html#finally" title="(in Python v3.11)"><code class="xref std std-keyword docutils literal notranslate"><span class="pre">finally</span></code></a> in <a class="reference internal" href="6_exceptions.html#else-finally"><span class="std std-numref">Section 6.5.2</span></a> has been also improved.</p>
 </section>
 </section>
 
@@ -248,8 +249,8 @@ <h2>Changes in the second edition<a class="headerlink" href="#changes-in-the-sec
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+    &#169; Copyright 2019-2023, David A. Ham.
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