title: Write Pandas Dataframe To Existing Tab in Excel
body: <p>I have a workbook called "Pivot Template.xlsx".  I have data from a query in a Pandas dataframe called "results".  I need to put this data on a tab called "Pivot Data".  I am using the code below for writing to the file, but the problem is that deletes all of the existing tabs when writing the file.</p>
  
  <pre><code>writer = pandas.ExcelWriter('Pivot Template.xlsx', engine='xlsxwriter')
  results.to_excel(writer, sheet_name='Pivot Data', index=False, encoding='utf8')
  writer.save()
  </code></pre>
  
  <p>I would like to get this working with just Pandas or openpyxl.  As one other catch, I have several other tabs that have pivot tables based off of this tab and I would like them to work after doing this write.</p>