a class="sourceLine" id="cb2-39" data-line-number="39">)</a>
<a class="sourceLine" id="cb2-40" data-line-number="40"></a>
<a class="sourceLine" id="cb2-41" data-line-number="41">df</a>
<a class="sourceLine" id="cb2-42" data-line-number="42"><span class="co">#&gt;      gender age</span></a>
<a class="sourceLine" id="cb2-43" data-line-number="43"><span class="co">#&gt; 1      male  34</span></a>
<a class="sourceLine" id="cb2-44" data-line-number="44"><span class="co">#&gt; 2      MALE  37</span></a>
<a class=