span><span class="o">.</span><span class="n">name</span> <span class="o">==</span> <span class="s2">&quot;period&quot;</span><span class="p">:</span>
</span><span id="L-21"><a href="#L-21"><span class="linenos">21</span></a>        <span class="k">return</span> <span class="mi">20</span>
</span><span id="L-22"><a href="#L-22"><span class="linenos">22</span></a>    <span class="k">raise</span> <span class="ne">NameError</span><span class="p">(</span><span class="n">param</span><span class="o">.</span><span c