title: writing pandas data frame to existing workbook
body: <p>I want to save a data frame to the second sheet of a file but I can't do that and I don't know why.</p>
  
  <pre><code>yfile = openpyxl.load_workbook(new_file, data_only=True) 
  ws = yfile.worksheets[0] 
  sheet2 = yfile.create_sheet() 
  ws2 = yfile.get_sheet_by_name("Sheet").title = "Analysis" 
  writer = pd.ExcelWriter(yfile, engine='xlsxwriter') 
  df3.to_excel(writer, sheet_name='Analysis') 
  writer.save()
  yfile.save(new_file)                                          
  </code></pre>
  
  <p>I have created the sheet 'Analysis' but when I save in it I received the following response: "AttributeError: 'Workbook' object has no attribute 'write'"</p>
  
  <p>What I have to modify?</p>