title: Python ElementTree XML Modifying Elements with Multiple Values
body: <p>Using Python 2.7 and <code>lxml</code>, how do I modify XML elements with multiple values?</p>
  
  <p>E.g.</p>
  
  <pre><code>    &lt;Title&gt;
        &lt;Playcount&gt;1&lt;/Playcount&gt;
        &lt;Genre&gt;Adventure&lt;/Genre&gt;
        &lt;Genre&gt;Comedy&lt;/Genre&gt;
        &lt;Genre&gt;Action&lt;/Genre&gt;
      &lt;/Title&gt;
  </code></pre>
  
  <p>It is straight forward to modify <code>Playcount</code>, as it has a single value. How do I modify <code>Genre</code>, witch has multiple values?</p>
  
  <p>e.g:</p>
  
  <ol>
  <li><p>How do I delete all but the first genre?</p></li>
  <li><p>How do I add a genre?</p></li>
  <li>How do I modify all Baseball genre to Sports?</li>
  </ol>
  
  <p>Thanks.</p>