lass="n">upper_bound</span> <span class="o">&gt;</span> <span class="n">lower_bound</span><span class="p">,</span> <span class="s2">&quot;The upper bound should be higher than lower bound&quot;</span>

        <span class="bp">self</span><span class="o">.</span><span class="n">upper_bound</span> <span class="o">=</span> <span class="n">upper_bound</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">lower_bound</span> <span class="o">=</span> <span class="n">lower_bound</span>
