n class="op">)</span>  <span class="co"># pop at empty Deque</span></span></span>
<span class="r-in"><span><span class="op">}</span><span class="op">)</span></span></span>
<span class="r-out co"><span class="r-pr">#&gt;</span> Error : pop at empty Deque</span>
<span class="r-in"><span></span></span>
<span class="r-in"><span><span class="va">d</span> <span class="op">=</span> <span class="fu">deque</span><span class="op">(</span>a <span class="op">=</span> <span class="fl">1</span>, b <span class="op">=</spa