t;</span><span class="p">)</span>
    <span class="k">return</span> <span class="n">x</span> <span class="o">*</span> <span class="mi">2</span>

<span class="kn">import</span><span class="w"> </span><span class="nn">grapapy</span>
<span class="n">xy</span> <span class="o">=</span> <span class="n">grapapy</span><span class="o">.</span><span class="n">grapa</span><span class="p">()</span>
<span class="n">xy</span><span class="o">.</span><span class="n">eval</span><span class="p">(</span><span class="s2">&quot