title: Python remove tuples and merge the two values from tuples inside them to one item
body: <p>I have list similar to this:</p>
  <pre><code>[('name', ''),
   ('season', ''),
   ('company', ''),
   ('date', ''),
   ('mean value', 1),
   ('mean value', 2),
   ('mean value', 3),
   ('mean value', 4)]
  </code></pre>
  <p>I would like to get rid of the tuples and to merge between the two values if exists, to get the following list:</p>
  <pre><code>['name',
   'season',
   'company',
   'date',
   'mean value 1',
   'mean value 2',
   'mean value 3',
   'mean value 4']
  </code></pre>
  <p>I'm not sure how to do this, looking for ways to do this efficiently.</p>