title: Removing gridlines from excel using python (openpyxl)
body: <p>I'm trying to remove gridlines from excel worksheet which I created using openpyxl, and it's not working. 
  I'm doing this:</p>
  
  <pre><code>wb = Workbook()   
  ws = wb.get_active_sheet()
  ws.show_gridlines = False
  print ws.show_gridlines
  wb.save('file.xlsx')
  </code></pre>
  
  <p>The that code prints the 'False', yet the saved file shows gridlines.</p>