n class="o">=</span><span class="nb">access</span><span class="p">(</span><span class="n">filenames</span><span class="p">,</span><span class="n">R_OK</span><span class="p">)</span><span class="w"></span>
<span class="w">          </span><span class="n">filenames</span><span class="o">=</span><span class="nb">pack</span><span class="p">(</span><span class="n">filenames</span><span class="p">,</span><span class="n">mask</span><span class="o">=</span><span class="n">mymask</span><span class="p">)</span><span 