span class="sd">        Path to the mars request file.</span>

<span class="sd">    Return</span>
<span class="sd">    ------</span>

<span class="sd">    &#39;&#39;&#39;</span>
    <span class="k">if</span> <span class="n">request</span> <span class="o">!=</span> <span class="mi">0</span><span class="p">:</span>
        <span class="k">if</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">isfile</span><span class="p">(</span><span clas