title: How to transform pandas.core.series.Series to list?
body: <p>I tried </p>
  
  <pre><code>print(type(numbers[2]))
  numbers[2].tolist()
  print(type(numbers[2]))
  </code></pre>
  
  <p>that doesn't work. I got</p>
  
  <pre><code>&lt;class 'pandas.core.series.Series'&gt;
  &lt;class 'pandas.core.series.Series'&gt;
  </code></pre>
  
  <p>Numbers is a matrix.</p>