title: Saving XlsxWriter workbook more than once
body: <p>I am writing software that manipulates Excel sheets. So far, I've been using xlrd and xlwt to do so, and everything works pretty well.</p>
  
  <ul>
  <li>It opens a sheet (xlrd) and copies select columns to a new workbook (xlwt)</li>
  <li>It then opens the newly created workbook to read data (xlrd) and does some math and formatting with the data (which couldn't be done if the file isn't saved once) - (xlwt saves once again)</li>
  </ul>
  
  <p>However, I am now willing to add charts in my documents, and this function is not supported by xlwt. I have found that xlsxwriter does, but this adds other complications to my code: xlsxwriter only has <code>xlsxwriter.close()</code>, which saves AND closes the document. </p>
  
  <p>Does anyone know if there's any workaround for this? Whenever I use <code>xlsxwriter.close()</code>, my workbook object containing the document I'm writing isn't usable anymore.</p>