title: stacked columns with pptx library of python
body: <p>How can I make the columns of the chart stacked when I build a .pptx report with pptx library of python?</p>
  
  <p>This is an example of the output that I need:</p>
  
  <p><img src="https://i.stack.imgur.com/HA0EO.png" alt=""></p>
  
  <p>Thank you in advance</p>