w">and</span> <span class="n">empty_class_label</span> <span class="ow">in</span> <span class="n">classes</span>
    <span class="n">list_valid_filenames_in_directory_function</span> <span class="o">=</span> \
        <span class="n">list_valid_filenames_in_directory_function</span> <span class="ow">or</span> <span class="n">list_valid_filenames_in_directory</span>

    <span class="k">if</span> <span class="n">seed</span><span class="p">:</span>
        <span class="n">random</span><span class="o">.</span>