span class="op">,</span> <span class="nam">stderr</span><span class="op">=</span><span class="key">None</span><span class="op">)</span><span class="op">:</span>&nbsp;</span><span class="r"></span></p>
    <p class="pln"><span class="n"><a id="t22" href="#t22">22</a></span><span class="t">        <span class="str">"""Assign new files for standard out and/or standard error."""</span>&nbsp;</span><span class="r"></span></p>
    <p class="par run show_par"><span class="n"><a id="t23" href="#t23">23</a></span><s