</span><span class="si">}</span><span class="s1">, it must be a function returning &quot;x&quot; and &quot;y&quot; values...&#39;</span><span class="p">)</span>
</span><span id="BaseNetFeeder-73"><a href="#BaseNetFeeder-73"><span class="linenos">73</span></a>
</span><span id="BaseNetFeeder-74"><a href="#BaseNetFeeder-74"><span class="linenos">74</span></a>    <span class="k">def</span> <span class="nf">refresh</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="o"