title: openpyxl - change width of n columns
body: <p>I am trying to change the column width for n number of columns.
  I am able to do this for rows as per the below code.</p>
  
  <pre><code>rowheight = 2
  while rowheight &lt; 601:
      ws.row_dimensions[rowheight].height = 4
      rowheight += 1
  </code></pre>
  
  <p>The problem I have is that columns are in letters and not numbers.</p>