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<div class="section" id="notes-for-session-09">
<span id="notes-session09"></span><h1>Notes for Session 09<a class="headerlink" href="#notes-for-session-09" title="Permalink to this headline">¶</a></h1>
<p>A collection of notes to go over in class, to keep things organized.</p>
<div class="section" id="lightning-talks">
<h2>Lightning Talks<a class="headerlink" href="#lightning-talks" title="Permalink to this headline">¶</a></h2>
<p>James Takata</p>
<p>Katherine Marguerite Anderson</p>
<p>Matthew D Briggs</p>
<p>[Make sure you’ve got the right adapter….]</p>
</div>
<div class="section" id="issues-that-came-up-during-the-week">
<h2>Issues that came up during the week.<a class="headerlink" href="#issues-that-came-up-during-the-week" title="Permalink to this headline">¶</a></h2>
<div class="section" id="private-attributes-and-dunders">
<h3>“private” attributes and dunders<a class="headerlink" href="#private-attributes-and-dunders" title="Permalink to this headline">¶</a></h3>
<p><code class="docutils literal"><span class="pre">_something</span></code> vs <code class="docutils literal"><span class="pre">__something</span></code> vs <code class="docutils literal"><span class="pre">__something__</span></code></p>
<p>Let’s talk about that…</p>
</div>
<div class="section" id="adding-parameters-to-a-subclass-init">
<h3>Adding parameters to a subclass __init__<a class="headerlink" href="#adding-parameters-to-a-subclass-init" title="Permalink to this headline">¶</a></h3>
<p>In general, when you override a method in a subclass, you want the method signature to be the same. That is – all the parameters should be the same.</p>
<p>However, sometimes, particularly with <code class="docutils literal"><span class="pre">__init__</span></code>, you may need a couple extra parameters. To keep things clean and extensible, you want to put the extra parameters at the beginning, before the super class’ parameters:</p>
<p>And this lets you use <code class="docutils literal"><span class="pre">*args</span></code> and <code class="docutils literal"><span class="pre">**kwargs</span></code> to pass along the usual ones.</p>
<div class="highlight-python"><div class="highlight"><pre><span></span><span class="k">class</span> <span class="nc">Base</span><span class="p">:</span>
<span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">par1</span><span class="p">,</span> <span class="n">par2</span><span class="p">,</span> <span class="n">par3</span><span class="o">=</span><span class="n">something</span><span class="p">,</span> <span class="n">par4</span><span class="o">=</span><span class="n">something</span><span class="p">):</span>
<span class="o">...</span>
<span class="k">class</span> <span class="nc">Subclass</span><span class="p">(</span><span class="n">Base</span><span class="p">):</span>
<span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">newpar1</span><span class="p">,</span> <span class="n">newpar2</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">newpar1</span> <span class="o">=</span> <span class="n">newpar1</span>
<span class="bp">self</span><span class="o">.</span><span class="n">newpar2</span> <span class="o">=</span> <span class="n">newpar2</span>
<span class="nb">super</span><span class="p">()</span><span class="o">.</span><span class="fm">__init__</span><span class="p">(</span><span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwarg</span><span class="p">)</span>
</pre></div>
</div>
<p>Example: html_render Anchor tag:</p>
<div class="highlight-python"><div class="highlight"><pre><span></span><span class="k">class</span> <span class="nc">A</span><span class="p">(</span><span class="n">OneLineTag</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> anchor element</span>
<span class="sd"> """</span>
<span class="n">tag</span> <span class="o">=</span> <span class="s2">"a"</span>
<span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">link</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
<span class="n">kwargs</span><span class="p">[</span><span class="s1">'href'</span><span class="p">]</span> <span class="o">=</span> <span class="n">link</span>
<span class="nb">super</span><span class="p">()</span><span class="o">.</span><span class="fm">__init__</span><span class="p">(</span><span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">)</span>
</pre></div>
</div>
<p>This becomes particularly important with <code class="docutils literal"><span class="pre">super()</span></code> and subclassing…</p>
<p>which we will get more into today.</p>
</div>
<div class="section" id="any-other-html-render-questions">
<h3>Any other html_render questions?<a class="headerlink" href="#any-other-html-render-questions" title="Permalink to this headline">¶</a></h3>
</div>
</div>
<div class="section" id="id1">
<h2>Lightning Talks<a class="headerlink" href="#id1" title="Permalink to this headline">¶</a></h2>
<p>James Takata</p>
<p>Katherine Marguerite Anderson</p>
<p>Matthew D Briggs</p>
</div>
<div class="section" id="new-topics">
<h2>New Topics<a class="headerlink" href="#new-topics" title="Permalink to this headline">¶</a></h2>
<div class="section" id="sorting">
<h3>sorting<a class="headerlink" href="#sorting" title="Permalink to this headline">¶</a></h3>
<p>maybe it’s a good idea to add a sort_key method to your classes?</p>
<p>see <code class="docutils literal"><span class="pre">IntroPython-2017/examples/Session09/sort_key.py</span></code></p>
<p>let’s try it on Circle….</p>
</div>
<div class="section" id="classmethod">
<h3>classmethod<a class="headerlink" href="#classmethod" title="Permalink to this headline">¶</a></h3>
<p><code class="docutils literal"><span class="pre">classmethod</span></code> is really pretty simple to use, not much to talk about. But it can be a bit challenging to “get”.</p>
<p>The key point is that classmethods work for subclasses – like for alternate constructors.</p>
<p>Let’s look at that with my Circle solution:</p>
<p><code class="docutils literal"><span class="pre">IntroPython-2017/solutions/Session08/circle.py</span></code></p>
<p>(and answer any other questions about Circle, while we are at it)</p>
</div>
<div class="section" id="multiple-inheritance-and-super">
<h3>multiple inheritance and super()<a class="headerlink" href="#multiple-inheritance-and-super" title="Permalink to this headline">¶</a></h3>
<p><code class="docutils literal"><span class="pre">super()</span></code> is a mixed bag –it’s actually a pretty complex topic, but can be pretty easy to use – at least in the easy cases.</p>
<p>To get the hang of multiple inheritance, mix-ins, and <code class="docutils literal"><span class="pre">super()</span></code>, we’ll play around with object canvas:</p>
<p>See: <code class="docutils literal"><span class="pre">IntroPython-2017/examples/Session09/object_canvas.py</span></code></p>
</div>
<div class="section" id="object-oriented-mailroom">
<h3>Object Oriented Mailroom<a class="headerlink" href="#object-oriented-mailroom" title="Permalink to this headline">¶</a></h3>
<p>One more time!</p>
<p>Yes, it’s time to make mailroom Object oriented:</p>
<p><a class="reference external" href="https://uwpce-pythoncert.github.io/PythonCertDevel/exercises/mailroom-oo.html#exercise-mailroom-oo" title="(in PythonCert v4.0)"><span>Mailroom - Object Oriented</span></a></p>
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