title: Python - converting a list of tuples to a list of strings
body: <p>I have a list of tuples that looks like this:</p>
  
  <pre><code>[('this', 'is'), ('is', 'the'), ('the', 'first'), ('first', 'document'), ('document', '.')]
  </code></pre>
  
  <p>What is the most pythonic and efficient way to convert into this where each token is separated by a space:</p>
  
  <pre><code>['this is', 'is the', 'the first', 'first document', 'document .']
  </code></pre>