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<li><a class="reference internal" href="#">Python Classes</a><ul>
<li><a class="reference internal" href="#basics">Basics</a></li>
<li><a class="reference internal" href="#multiple-inheritance">Multiple Inheritance</a></li>
<li><a class="reference internal" href="#additional-notes-on-classes">Additional Notes on Classes</a></li>
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<div class="section" id="python-classes">
<h1>Python Classes<a class="headerlink" href="#python-classes" title="Permalink to this headline">¶</a></h1>
<div class="section" id="basics">
<h2>Basics<a class="headerlink" href="#basics" title="Permalink to this headline">¶</a></h2>
<p>Begin by starting IPython with pylab:</p>
<div class="highlight-python"><pre>$ ipython --pylab</pre>
</div>
<p>Classes definitions include the <tt class="docutils literal"><span class="pre">class</span></tt> declaration, an identifier, and a
colon:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="k">class</span> <span class="nc">MyClass</span><span class="p">:</span>
<span class="k">pass</span>
<span class="n">h</span> <span class="o">=</span> <span class="n">MyClass</span><span class="p">()</span>
</pre></div>
</div>
<p>This class <tt class="docutils literal"><span class="pre">MyClass</span></tt> isn’t very interesting since it does not contain any
methods or attributes. The <tt class="docutils literal"><span class="pre">pass</span></tt> is simply a placeholder in the class
declaration indicating a no-op.</p>
<p>Class instances are mutable, meaning that attributes and functions can be added
after instantiation:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="k">print</span> <span class="n">h</span><span class="o">.</span><span class="n">msg</span>
</pre></div>
</div>
<p>There is no attribute <tt class="docutils literal"><span class="pre">msg</span></tt>, so add one:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="n">h</span><span class="o">.</span><span class="n">msg</span> <span class="o">=</span> <span class="s">"Hello World!"</span>
<span class="k">print</span> <span class="n">h</span><span class="o">.</span><span class="n">msg</span>
</pre></div>
</div>
<p>Create a class with a static string attribute <tt class="docutils literal"><span class="pre">msg1</span></tt> and a class method
<tt class="docutils literal"><span class="pre">echo</span></tt> to print the attribute. Comments begin with a <tt class="docutils literal"><span class="pre">#</span></tt> and extend to the
end of the line:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="k">class</span> <span class="nc">Hello</span><span class="p">:</span>
<span class="c"># static attribute string "msg1"</span>
<span class="n">msg1</span> <span class="o">=</span> <span class="s">"Hello"</span>
<span class="k">def</span> <span class="nf">echo</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">print</span> <span class="bp">self</span><span class="o">.</span><span class="n">msg1</span>
<span class="k">print</span> <span class="s">"Hello's msg1:"</span><span class="p">,</span> <span class="n">Hello</span><span class="o">.</span><span class="n">msg1</span>
<span class="n">h</span> <span class="o">=</span> <span class="n">Hello</span><span class="p">()</span>
<span class="n">h</span><span class="o">.</span><span class="n">echo</span><span class="p">()</span>
<span class="k">print</span> <span class="n">h</span>
</pre></div>
</div>
<p>Create a class with a constructor definition. Initialize an attribute <tt class="docutils literal"><span class="pre">msg2</span></tt>
at class instance creation time:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="k">class</span> <span class="nc">World</span><span class="p">:</span>
<span class="c"># class constructor</span>
<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">msg2</span><span class="o">=</span><span class="s">"World"</span><span class="p">):</span>
<span class="c"># attribute "msg2" initialized in constructor</span>
<span class="bp">self</span><span class="o">.</span><span class="n">msg2</span> <span class="o">=</span> <span class="n">msg2</span>
<span class="k">def</span> <span class="nf">echo</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">print</span> <span class="bp">self</span><span class="o">.</span><span class="n">msg2</span>
<span class="n">w</span> <span class="o">=</span> <span class="n">World</span><span class="p">()</span>
<span class="n">w</span><span class="o">.</span><span class="n">echo</span><span class="p">()</span>
<span class="k">print</span> <span class="n">w</span>
</pre></div>
</div>
</div>
<div class="section" id="multiple-inheritance">
<h2>Multiple Inheritance<a class="headerlink" href="#multiple-inheritance" title="Permalink to this headline">¶</a></h2>
<p>Create a class that inherits from <tt class="docutils literal"><span class="pre">Hello</span></tt> and <tt class="docutils literal"><span class="pre">World</span></tt>. Initialize an
attribute <tt class="docutils literal"><span class="pre">msg3</span></tt> using attributes from inherited classes. Override the method
<tt class="docutils literal"><span class="pre">echo</span></tt> to call methods from inherited classes. Define the <tt class="docutils literal"><span class="pre">__str__</span></tt> to
return the attribute <tt class="docutils literal"><span class="pre">msg3</span></tt> when the class instance is printed with
<tt class="docutils literal"><span class="pre">print</span></tt>:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="k">class</span> <span class="nc">HelloWorld</span><span class="p">(</span><span class="n">Hello</span><span class="p">,</span> <span class="n">World</span><span class="p">):</span>
<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="c"># self.msg1 is from Hello</span>
<span class="c"># self.msg2 is from World</span>
<span class="c"># World constructor is needed since msg2 is not static!</span>
<span class="n">World</span><span class="o">.</span><span class="n">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">msg3</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">msg1</span> <span class="o">+</span> <span class="s">" "</span> <span class="o">+</span> <span class="bp">self</span><span class="o">.</span><span class="n">msg2</span> <span class="o">+</span> <span class="s">"!"</span>
<span class="k">def</span> <span class="nf">echo</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="n">Hello</span><span class="o">.</span><span class="n">echo</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span>
<span class="n">World</span><span class="o">.</span><span class="n">echo</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">__str__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">msg3</span>
<span class="n">hw</span> <span class="o">=</span> <span class="n">HelloWorld</span><span class="p">()</span>
<span class="n">hw</span><span class="o">.</span><span class="n">echo</span><span class="p">()</span>
<span class="k">print</span> <span class="n">hw</span>
</pre></div>
</div>
<p>Class <tt class="docutils literal"><span class="pre">HelloWorld</span></tt> is of type <tt class="docutils literal"><span class="pre">Hello</span></tt>, <tt class="docutils literal"><span class="pre">World</span></tt>, and <tt class="docutils literal"><span class="pre">HelloWorld</span></tt>:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="nb">isinstance</span><span class="p">(</span><span class="n">hw</span><span class="p">,</span> <span class="n">Hello</span><span class="p">)</span>
<span class="nb">isinstance</span><span class="p">(</span><span class="n">hw</span><span class="p">,</span> <span class="n">World</span><span class="p">)</span>
<span class="nb">isinstance</span><span class="p">(</span><span class="n">hw</span><span class="p">,</span> <span class="n">HelloWorld</span><span class="p">)</span>
<span class="nb">isinstance</span><span class="p">(</span><span class="n">hw</span><span class="p">,</span> <span class="n">MyClass</span><span class="p">)</span>
</pre></div>
</div>
</div>
<div class="section" id="additional-notes-on-classes">
<h2>Additional Notes on Classes<a class="headerlink" href="#additional-notes-on-classes" title="Permalink to this headline">¶</a></h2>
<p>Classes can contain other classes as attributes:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="k">class</span> <span class="nc">HelloWorld</span><span class="p">:</span>
<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">msg</span><span class="o">=</span><span class="s">"World World"</span><span class="p">):</span>
<span class="c"># create Hello and World objects as attributes</span>
<span class="bp">self</span><span class="o">.</span><span class="n">h</span> <span class="o">=</span> <span class="n">Hello</span><span class="p">()</span>
<span class="bp">self</span><span class="o">.</span><span class="n">w</span> <span class="o">=</span> <span class="n">World</span><span class="p">(</span><span class="n">msg</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">echo</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="c"># call their echo methods</span>
<span class="bp">self</span><span class="o">.</span><span class="n">h</span><span class="o">.</span><span class="n">echo</span><span class="p">()</span>
<span class="bp">self</span><span class="o">.</span><span class="n">w</span><span class="o">.</span><span class="n">echo</span><span class="p">()</span>
<span class="n">hw</span> <span class="o">=</span> <span class="n">HelloWorld</span><span class="p">()</span>
<span class="n">hw</span><span class="o">.</span><span class="n">echo</span><span class="p">()</span>
<span class="nb">isinstance</span><span class="p">(</span><span class="n">hw</span><span class="p">,</span> <span class="n">Hello</span><span class="p">)</span>
<span class="nb">isinstance</span><span class="p">(</span><span class="n">hw</span><span class="p">,</span> <span class="n">HelloWorld</span><span class="p">)</span>
</pre></div>
</div>
<p>Classes have special methods that can be defined to correspond to certain
language operators. Define how a class behaves using the ‘+’ operator:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="k">class</span> <span class="nc">Hello</span><span class="p">:</span>
<span class="n">msg</span> <span class="o">=</span> <span class="s">"Hello"</span>
<span class="k">def</span> <span class="nf">__add__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">lhs</span><span class="p">):</span>
<span class="k">print</span> <span class="bp">self</span><span class="o">.</span><span class="n">msg</span> <span class="o">+</span> <span class="n">lhs</span><span class="o">.</span><span class="n">msg</span>
<span class="k">class</span> <span class="nc">World</span><span class="p">:</span>
<span class="n">msg</span> <span class="o">=</span> <span class="s">"World"</span>
<span class="k">def</span> <span class="nf">__add__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">rhs</span><span class="p">):</span>
<span class="k">print</span> <span class="bp">self</span><span class="o">.</span><span class="n">msg</span> <span class="o">+</span> <span class="n">rhs</span><span class="o">.</span><span class="n">msg</span>
<span class="n">Hello</span><span class="p">()</span> <span class="o">+</span> <span class="n">World</span><span class="p">()</span>
<span class="n">World</span><span class="p">()</span> <span class="o">+</span> <span class="n">Hello</span><span class="p">()</span>
</pre></div>
</div>
<div class="admonition-exercise-for-the-interested-reader admonition">
<p class="first admonition-title">Exercise (for the interested reader):</p>
<p class="last">Define a class <tt class="docutils literal"><span class="pre">Powlaw</span></tt> that accepts two keyword arguments in its
constructor: <tt class="docutils literal"><span class="pre">index</span></tt> and <tt class="docutils literal"><span class="pre">norm</span></tt>. The keyword arguments are initialized
as <tt class="docutils literal"><span class="pre">index=2.0</span></tt> and <tt class="docutils literal"><span class="pre">norm=0.01</span></tt>. In the class constructor definition, set
<tt class="docutils literal"><span class="pre">index</span></tt> and <tt class="docutils literal"><span class="pre">norm</span></tt> as class attributes. Define a class method <tt class="docutils literal"><span class="pre">calc</span></tt>
which takes an argument <tt class="docutils literal"><span class="pre">wave</span></tt> and computes a power-law on <tt class="docutils literal"><span class="pre">wave</span></tt> using
<tt class="docutils literal"><span class="pre">index</span></tt> and <tt class="docutils literal"><span class="pre">norm</span></tt>. The <tt class="docutils literal"><span class="pre">wave</span></tt> argument can be assumed to be a 1-D
NumPy array object. <tt class="docutils literal"><span class="pre">calc</span></tt> should return the calculated result.</p>
</div>
<p class="flip0">Click to Show/Hide Solution</p> <div class="panel0"><p>Answer:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="k">class</span> <span class="nc">Powlaw</span><span class="p">:</span>
<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">index</span> <span class="o">=</span> <span class="mf">2.0</span><span class="p">,</span> <span class="n">norm</span> <span class="o">=</span> <span class="mf">0.01</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">index</span> <span class="o">=</span> <span class="n">index</span>
<span class="bp">self</span><span class="o">.</span><span class="n">norm</span> <span class="o">=</span> <span class="n">norm</span>
<span class="k">def</span> <span class="nf">calc</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">wave</span><span class="p">):</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">norm</span><span class="o">*</span><span class="p">(</span><span class="n">wave</span><span class="o">**</span><span class="bp">self</span><span class="o">.</span><span class="n">index</span><span class="p">)</span>
<span class="n">p</span> <span class="o">=</span> <span class="n">Powlaw</span><span class="p">()</span>
<span class="n">p</span><span class="o">.</span><span class="n">calc</span><span class="p">(</span><span class="n">array</span><span class="p">([</span><span class="mi">1</span><span class="p">,</span><span class="mi">2</span><span class="p">,</span><span class="mi">3</span><span class="p">]))</span>
</pre></div>
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