title: Python Excel, Is it possible to update values of a created graph?
body: <p>I made a sheet with a graph using <code>python</code> and <code>openpyxl</code>.    Later on in the code I add some extra cells that I would also like to see in the graph.   Is there a way that I can change the range of cell that the graph is using, or maybe there is another library that lets me do this?</p>
  
  <p><strong>Example:</strong>
  my graph initially uses columns A1:B10, then I want to update it to use A1:D10</p>
  
  <p>Currently I am deleting the sheet, and recreating it, writing back the values and making the graph again,  the problem is that this is a big process that takes days, and there will be a point that rewriting the sheet will take some time.</p>