title: More elegant/pythonic way of unpacking a list?
body: <p>Is there a more elegant/pythonic way of unpacking this list?</p>
  
  <pre><code>feature_set = [['flew'], ['homes'], ['fly home']]
  </code></pre>
  
  <p>Into this:</p>
  
  <pre><code>flew|homes|fly home
  </code></pre>
  
  <p>without this ugly code:</p>
  
  <pre><code>output = ''
  for feature in feature_set:
      if len(feature) &lt; 2: output += ''.join(feature) + '|'
      if len(feature) &gt; 1: output += ' '.join(feature) + '|'
  print(output[:-1])
  </code></pre>