title: ElementTree findall() returning empty list
body: <p>I am trying to write a small script for interacting with the last.fm API. </p>
  
  <p>I have a small bit of experience working with <code>ElementTree</code>, but the way I used it previously doesn't seem to be working, it instead returns an empty list.<br>
  I removed the API key as I don't know exactly how private it should be, and gave an example of the XML I am receiving in it's place.</p>
  
  <p>Class for interacting with API:</p>
  
  <pre class="lang-py prettyprint-override"><code>from xml.etree import ElementTree
  import urllib
  import urllib2
  
  class Last_fmWrapper(object):
      def __init__(self):
          self.last_fm_api_key = '*****************************'
          self.api_url = 'http://ws.audioscrobbler.com/2.0/'
      def get_now_playing(self, last_fm_user, method):
          self.last_fm_user = last_fm_user
          self.method = method
          parameters = {'user':self.last_fm_user, 'api_key':self.last_fm_api_key, 'method':self.method}
          encoded_parameters = urllib.urlencode(parameters)
          request = urllib2.Request(self.api_url, encoded_parameters)
          response = urllib2.urlopen(request)
          api_results = ElementTree.parse(response).findall('track')
          # why does api_results == []?
  
      def compare_tasteometer(self):
          pass
  
      def register_user(self):
          pass
  </code></pre>
  
  <hr>
  
  <p>Call to get_now_playing method of <code>Last_fmWrapper()</code>:</p>
  
  <pre class="lang-py prettyprint-override"><code>from last_fm_wrapper import Last_fmWrapper
  last_fm = Last_fmWrapper()
  now_playing = last_fm.get_now_playing('BiriBiriRG', 'user.getRecentTracks')
  if now_playing == None:
      print 'You not currently playing anything.'
  else:
      print 'You are now playing {}'.format(now_playing)
  </code></pre>
  
  <hr>
  
  <p>Sample of xml I receive:</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;lfm status="ok"&gt;
  &lt;recenttracks user="BiriBiriRG" page="1" perPage="10" totalPages="18406" total="184058" &gt;
  &lt;track&gt; 
                  &lt;artist mbid="01809552-4f87-45b0-afff-2c6f0730a3be"&gt;Elvis Presley&lt;/artist&gt;
  &lt;name&gt;Thrill Of Your Love&lt;/name&gt;
  &lt;streamable&gt;1&lt;/streamable&gt;
  &lt;mbid&gt;&lt;/mbid&gt;
          &lt;album mbid="c445fa3a-3b24-41d4-b955-b6ca560c6f7a"&gt;Love Songs&lt;/album&gt;
      &lt;url&gt;http://www.last.fm/music/Elvis+Presley/_/Thrill+Of+Your+Love&lt;/url&gt;
      &lt;image size="small"&gt;http://userserve-ak.last.fm/serve/34s/69037914.png&lt;/image&gt;
      &lt;image size="medium"&gt;http://userserve-ak.last.fm/serve/64s/69037914.png&lt;/image&gt;
      &lt;image size="large"&gt;http://userserve-ak.last.fm/serve/126/69037914.png&lt;/image&gt;
      &lt;image size="extralarge"&gt;http://userserve-ak.last.fm/serve/300x300/69037914.png&lt;/image&gt;
          &lt;date uts="1328153196"&gt;2 Feb 2012, 03:26&lt;/date&gt;
  &lt;/track&gt;
  &lt;track&gt; 
                  &lt;artist mbid="efc8a006-d0c6-4a9b-8cb1-91ca770fa2b9"&gt;Colbie Caillat&lt;/artist&gt;
  &lt;name&gt;Oxygen&lt;/name&gt;
  &lt;streamable&gt;1&lt;/streamable&gt;
  &lt;mbid&gt;&lt;/mbid&gt;
          &lt;album mbid="2d297b29-a215-42fe-8a8c-dc8b502903b1"&gt;Coco&lt;/album&gt;
      &lt;url&gt;http://www.last.fm/music/Colbie+Caillat/_/Oxygen&lt;/url&gt;
      &lt;image size="small"&gt;http://userserve-ak.last.fm/serve/34s/69229764.png&lt;/image&gt;
      &lt;image size="medium"&gt;http://userserve-ak.last.fm/serve/64s/69229764.png&lt;/image&gt;
      &lt;image size="large"&gt;http://userserve-ak.last.fm/serve/126/69229764.png&lt;/image&gt;
      &lt;image size="extralarge"&gt;http://userserve-ak.last.fm/serve/300x300/69229764.png&lt;/image&gt;
          &lt;date uts="1328152962"&gt;2 Feb 2012, 03:22&lt;/date&gt;
  &lt;/track&gt;
  &lt;track&gt; 
  </code></pre>