title: Convert pandas Series to DataFrame
body: <p>I have a Pandas series sf:</p>
  
  <pre><code>email
  email1@email.com    [1.0, 0.0, 0.0]
  email2@email.com    [2.0, 0.0, 0.0]
  email3@email.com    [1.0, 0.0, 0.0]
  email4@email.com    [4.0, 0.0, 0.0]
  email5@email.com    [1.0, 0.0, 3.0]
  email6@email.com    [1.0, 5.0, 0.0]
  </code></pre>
  
  <p>And I would like to transform it to the following DataFrame:</p>
  
  <pre><code>index | email             | list
  _____________________________________________
  0     | email1@email.com  | [1.0, 0.0, 0.0]
  1     | email2@email.com  | [2.0, 0.0, 0.0]
  2     | email3@email.com  | [1.0, 0.0, 0.0]
  3     | email4@email.com  | [4.0, 0.0, 0.0]
  4     | email5@email.com  | [1.0, 0.0, 3.0]
  5     | email6@email.com  | [1.0, 5.0, 0.0]
  </code></pre>
  
  <p>I found a way to do it, but I doubt it's the more efficient one:</p>
  
  <pre><code>df1 = pd.DataFrame(data=sf.index, columns=['email'])
  df2 = pd.DataFrame(data=sf.values, columns=['list'])
  df = pd.merge(df1, df2, left_index=True, right_index=True)
  </code></pre>