&quot;)</span>
        <span class="c1"># print(&quot;\t\tBefore calling buildWalk&quot;)</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">_quantumWalk</span><span class="o">.</span><span class="n">buildWalk</span><span class="p">(</span><span class="n">time</span><span class="p">,</span> <span class="n">observables</span><span class="p">,</span> <span class="n">opts</span><span class="p">)</span>
        <span class="c1"># print(&quot;\t\tAfter calling buildWalk&quot;)</sp