title: set_style in Python xlwt library does not work for cells containing text
body: <p>I'm working with an Excel spreadsheet in Python. I want to change the background color of an entire row if a condition is not respected. However, after running my code, only the background color of the empty cells of the rows (the one not containing any character) is changed. My first 9 columns contain information and my code only changes the background color from column J to Z.</p>
  
  <pre><code>from xlrd import open_workbook
  from xlwt import Workbook, easyxf
  Error_Style = easyxf('pattern: pattern solid, fore_colour red;',)
  
  [...]
  
  else:
  w_sheet.row(row_index).set_style(Error_Style)
  
  [...]
  </code></pre>
  
  <p>I was wondering if I am using the wrong pattern with easyxf.  </p>