">&lt;%</span><span class="nb">def</span> <span class="na">name=</span><span class="s">&quot;conditional(expression)&quot;</span><span class="cp">&gt;</span>
    <span class="cp">%</span> <span class="k">if</span> <span class="n">expression</span><span class="p">:</span><span class="x"></span>
<span class="x">        </span><span class="cp">${</span><span class="n">caller</span><span class="o">.</span><span class="n">body</span><span class="p">()</span><span class="cp">}</span>
    <span class="cp">%</span>