n><span class="p">(</span><span class="n">diag</span><span class="p">,</span><span class="s1">&#39;U&#39;</span><span class="p">)</span><span class="w"> </span><span class="p">.</span><span class="nb">and</span><span class="p">.</span><span class="w"> </span><span class="p">.</span><span class="nb">not</span><span class="p">.</span><span class="n">lsame</span><span class="p">(</span><span class="n">diag</span><span class="p">,</span><span class="s1">&#39;N&#39;</span><span class="p">))</span><span class="w"