title: Python pandas insert empty rows after each row
body: <p>Hello I am trying to insert 3 empty rows after each row of the current data using pandas then export the data. For example a sample current data could be:</p>
  <pre><code>name     profession
  Bill      cashier
  Sam        stock
  Adam      security
  </code></pre>
  <p>Ideally what I want to achieve:</p>
  <pre><code>name     profession
  Bill      cashier
  Nan         Nan
  Nan         Nan
  Nan         Nan
  Sam        stock
  Nan         Nan
  Nan         Nan
  Nan         Nan
  Adam      security
  Nan         Nan
  Nan         Nan
  Nan         Nan
  </code></pre>
  <p>I have experimented with itertools however i am not sure how i can precisely get three empty rows using after each row using this method. Any help, guidance, sample would definitely be appreciative!</p>