title: Duplicate rows, according to value in a column
body: <p>I want to read an Excel File and want my code to duplicate rows according to the value in one of the columns in that excel file.</p>
  
  <p>e.g.</p>
  
  <pre><code>    Col 1  Col 2
  0   Adam      3
  1  Sarah      2
  2   John      0
  </code></pre>
  
  <p>I want my code read above file and copy Adam's row 3 times and Sarah's row 2 times and export in a new file. </p>