title: How to access greatgrandchild elements from Elementtree in python?
body: <p>I having difficulty in accessing the great-grandchildren using element tree in python.
  Specifically, I want access the tree of Ev,Ec,St,DU and Si. The full xml is attached together at the bottom of this thread.</p>
  
  <p>I tried the following code, but it return nothing.</p>
  
  <pre><code>import xml.etree.ElementTree as ET
  tree = ET.parse('shhs_eval.xml')
  root = tree.getroot()
  for ScoreEvent in root.findall('Sco'):
      Event = ScoreEvent.find('Ev').text
      Start = ScoreEvent.find('St').text
      print(Event,Start)
  </code></pre>
  
  <p>Thanks in advance</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="UTF-8" standalone="no"?&gt;
      &lt;PSG&gt;
      &lt;Sof&gt;Compumedics&lt;/Sof&gt;
      &lt;Ep&gt;30&lt;/Ep&gt;
      &lt;Scs&gt;
      &lt;Sco&gt;
          &lt;Ev&gt;Arousal&lt;/Ev&gt;
          &lt;Ec&gt;Arousal|Arousal ()&lt;/Ec&gt;
          &lt;St&gt;8062.4&lt;/St&gt;
          &lt;Du&gt;22.8&lt;/Du&gt;
          &lt;Si&gt;EMG&lt;/Si&gt;
      &lt;/Sco&gt;
      &lt;Sco&gt;
          &lt;Ev&gt;N1&lt;/Ev&gt;
          &lt;Evc&gt;wl|Aw ()&lt;/Evc&gt;
          &lt;St&gt;8062.4&lt;/St&gt;
          &lt;Du&gt;22.8&lt;/Du&gt;
          &lt;Si&gt;EMG&lt;/Si&gt;
      &lt;/Sco&gt;
      &lt;/Scs&gt;
      &lt;/PSG&gt;
  </code></pre>