title: Adding a sheet to an existing excel worksheet without deleting other sheet
body: <p>I am trying to add a sheet to the excel file: ex.xls and whenever I do it deletes all the previously made sheets. </p>
  
  <p><strong>How do I add a sheet to this excel file without deleting the other sheets?</strong></p>
  
  <p>Here is my code to create a sheet:</p>
  
  <pre><code>import xlwt
  import xlrd
  
  wb = Workbook()
  Sheet1 = wb.add_sheet('Sheet1')
  wb.save('ex.xls')
  </code></pre>