title: How to concatenate three excels files xlsx using python?
body: <p>Hello I would like to concatenate three excels files xlsx using python.</p>
  
  <p>I have tried using openpyxl, but I don't know which function could help me to append three worksheet into one.</p>
  
  <p>Do you have any ideas how to do that ?</p>
  
  <p>Thanks a lot</p>