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<section id="loading-functions-from-an-external-file">
<h1>Loading functions from an external file<a class="headerlink" href="#loading-functions-from-an-external-file" title="Permalink to this heading">¶</a></h1>
<p><strong>08-load-function.py</strong></p>
<p>With the <cite>load</cite> function, the user can use functions defined in
an external file within its script. This makes possible to create
frequently used custom functions only once and use them as often
as desired. The syntax is:</p>
<div class="highlight-scheme notranslate"><div class="highlight"><pre><span></span><span class="p">(</span><span class="k">load</span><span class="w"> </span><span class="nv">path/to/the/file</span><span class="p">)</span><span class="w"></span>
</pre></div>
</div>
<p>The content of the file will be inserted where the load function
is called and all functions defined inside the file will then be
accessible. The path can be absolute or relative to the current
working directory.</p>
<p>See the content of those files for the function implementations.</p>
<ul class="simple">
<li><p><a class="reference external" href="https://github.com/belangeo/pyo/blob/master/pyo/examples/23-expression/utils.expr">utils.expr</a></p></li>
<li><p><a class="reference external" href="https://github.com/belangeo/pyo/blob/master/pyo/examples/23-expression/filters.expr">filters.expr</a></p></li>
<li><p><a class="reference external" href="https://github.com/belangeo/pyo/blob/master/pyo/examples/23-expression/generators.expr">generators.expr</a></p></li>
</ul>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="kn">from</span> <a class="sphinx-codeautolink-a" href="../../api/alphabetical.html#module-pyo" title="pyo"><span class="nn">pyo</span></a> <span class="kn">import</span> <span class="o">*</span>
<span class="n">s</span> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/server.html#pyo.Server" title="pyo.lib.server.Server"><span class="n">Server</span></a><span class="p">()</span><span class="o">.</span><span class="n">boot</span><span class="p">()</span>
<span class="n">expression</span> <span class="o">=</span> <span class="s2">"""</span>
<span class="s2">(load utils.expr) // scalef</span>
<span class="s2">(load filters.expr) // peak</span>
<span class="s2">(load generators.expr) // square</span>
<span class="s2">// This expression uses functions defined in the loaded files.</span>
<span class="s2">(peak (* (square 172 0) 0.2) (scalef (osc 0.2) 1000 5000) 0.9)</span>
<span class="s2">"""</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/expression.html#pyo.Expr" title="pyo.lib.expression.Expr"><span class="n">expr</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/expression.html#pyo.Expr" title="pyo.lib.expression.Expr"><span class="n">Expr</span></a><span class="p">(</span><a class="sphinx-codeautolink-a" href="../../api/classes/controls.html#pyo.Sig" title="pyo.lib._core.Sig"><span class="n">Sig</span></a><span class="p">(</span><span class="mi">0</span><span class="p">),</span> <span class="n">expression</span><span class="p">,</span> <span class="n">mul</span><span class="o">=</span><span class="mf">0.5</span><span class="p">)</span>
<span class="n">expr</span><span class="o">.</span><span class="n">editor</span><span class="p">()</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/analysis.html#pyo.Scope" title="pyo.lib.analysis.Scope"><span class="n">sc</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/analysis.html#pyo.Scope" title="pyo.lib.analysis.Scope"><span class="n">Scope</span></a><span class="p">(</span><a class="sphinx-codeautolink-a" href="../../api/classes/expression.html#pyo.Expr" title="pyo.lib.expression.Expr"><span class="n">expr</span></a><span class="p">)</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/analysis.html#pyo.Spectrum" title="pyo.lib.analysis.Spectrum"><span class="n">sp</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/analysis.html#pyo.Spectrum" title="pyo.lib.analysis.Spectrum"><span class="n">Spectrum</span></a><span class="p">(</span><a class="sphinx-codeautolink-a" href="../../api/classes/expression.html#pyo.Expr" title="pyo.lib.expression.Expr"><span class="n">expr</span></a><span class="p">)</span>
<span class="n">pan</span> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/pan.html#pyo.Pan" title="pyo.lib.pan.Pan"><span class="n">Pan</span></a><span class="p">(</span><a class="sphinx-codeautolink-a" href="../../api/classes/expression.html#pyo.Expr" title="pyo.lib.expression.Expr"><span class="n">expr</span></a><span class="p">)</span><span class="o">.</span><span class="n">out</span><span class="p">()</span>
<span class="n">s</span><span class="o">.</span><span class="n">gui</span><span class="p">(</span><span class="nb">locals</span><span class="p">())</span>
</pre></div>
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