 <span class="o">=</span> <span class="kc">True</span>
        <span class="k">if</span> <span class="ow">not</span> <span class="n">found</span><span class="p">:</span>
            <span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span><span class="s2">&quot;List of Thermodata does not contain enthalpy &quot;</span>
                             <span class="s2">&quot;values.&quot;</span><span class="p">)</span>
        <span class="bp">self</span><span class="o">.</span><spa