ass="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span>
                    <span class="s2">&quot;Please provide the property values, i.e. a dictionary that&quot;</span>
                    <span class="s2">&quot; maps an atomic element symbol to a property value.&quot;</span>
                <span class="p">)</span>

            <span class="n">values</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">array</span><span class="p">(</span