__</span><span class="o">.</span><span class="n">copy</span><span class="p">()</span>
            <span class="k">return</span>

            <span class="c1"># if b is None and a is array-like or tuple.</span>
        <span class="c1"># for example, data and delta to the end of timerange</span>
        <span class="k">if</span> <span class="n">b</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
            <span class="n">x</span> <span class="o">=</span> <span class="n"