an class="sd">    ftime : list of str</span>
<span class="sd">        The time in hours of the field.</span>
<span class="sd">    &#39;&#39;&#39;</span>
    <span class="k">if</span> <span class="ow">not</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">ftime</span><span class="p">,</span> <span class="nb">list</span><span class="p">):</span>
        <span class="n">ftime</span> <span class="o">=</span> <span class="p">[</span><span class="n">ftime</span><span class="p">]</spa