class="kc">None</span><span class="p">,</span>
            <span class="n">cell</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span>
            <span class="n">pbc</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span>
            <span class="n">celldisp</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span>
            <span class="n">constraint</span><span class="o">=</span><span class="kc">None</span><span class="p">,