</span> <span class="o">=</span> <span class="n">root</span>
                <span class="k">break</span>
    <span class="k">else</span><span class="p">:</span>
        <span class="n">nested_src_dir</span> <span class="o">=</span> <span class="kc">None</span>
        <span class="k">for</span> <span class="n">fn</span> <span class="ow">in</span> <span class="n">os</span><span class="o">.</span><span class="n">listdir</span><span class="p">(</span><span class="n">tmp_dir</span><span class="p">):</span>
   