p">(</span><span class="sa">f</span><span class="s2">&quot;Invalid freq </span><span class="si">{</span><span class="n">freq</span><span class="si">!r}</span><span class="s2">&quot;</span><span class="p">)</span>
</span><span id="sample_prices-20"><a href="#sample_prices-20"><span class="linenos">20</span></a>
</span><span id="sample_prices-21"><a href="#sample_prices-21"><span class="linenos">21</span></a>    <span class="n">fname</span> <span class="o">=</span> <span class="sa">f</span><span class="s2">&q