title: How to merge contents in the same node which belong to one xml file?
body: <p>Let's say, I have a xml file like this:</p>
  
  <pre><code>&lt;recs&gt;
  &lt;REC&gt;
  &lt;SYS_TOPIC&gt;topic1 topic1&lt;/SYS_TOPIC&gt;
  &lt;SYS_AUTHORS&gt;author1&lt;/SYS_AUTHORS&gt;
  &lt;DOC_CONTENT&gt;content1 content1 content1 content1 content1 content1 content1&lt;/DOC_CONTENT&gt;
  &lt;DOC_WRITEDATE&gt;2016-12-01 09:30:10&lt;/DOC_WRITEDATE&gt;
  &lt;/REC&gt;
  
  &lt;REC&gt;
  &lt;SYS_TOPIC&gt;topic2 topic2&lt;/SYS_TOPIC&gt;
  &lt;SYS_AUTHORS&gt;author2&lt;/SYS_AUTHORS&gt;
  &lt;DOC_CONTENT&gt;content2 content2 content2 content2 content2 content2 content1&lt;/DOC_CONTENT&gt;
  &lt;DOC_WRITEDATE&gt;2016-12-01 09:30:10&lt;/DOC_WRITEDATE&gt;
  &lt;/REC&gt;
  &lt;/recs&gt;
  </code></pre>
  
  <p>What if I wanna merge all the contents in the tag of <code>&lt;DOC_CONTENT&gt;</code> together in one? I tried <code>root.findall('DOC_CONTENT').text</code> But it consoles <code>'list' object has no attribute 'text'</code></p>