e are by ignored</span></span></span>
<span class="r-in"><span><span class="co"># by default but we can change that so that their behaviour is obvious.</span></span></span>
<span class="r-in"><span></span></span>
<span class="r-in"><span><span class="co"># rename can show us which columns are new and which have been</span></span></span>
<span class="r-in"><span><span class="co"># removed (with .dropped_cols)</span></span></span>
<span class="r-in"><span><span class="va">iris</span> <span class="op"><a href=