pan></span><span class="sig-name descname"><span class="pre">File3dmLayerTable</span></span><a class="headerlink" href="#rhino3dm.File3dmLayerTable" title="Link to this definition"></a></dt>
<dd><dl class="py method">
<dt class="sig sig-object py" id="rhino3dm.File3dmLayerTable.__len__">
<span class="sig-name descname"><span class="pre">__len__</span></span><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#rhino3dm.File3dmLayerTable.__len__" title="Link to this 