title: Read from / write to a specific location in Excel file
body: <p>Have a real use case for this. Want to be able to do some data aggregation and manipulation with Pandas, envisioned workflow as such:</p>
  
  <ol>
  <li>Find in an Excel file a named cell</li>
  <li>reach the boundary of the cell block (boundary defined by empty column / row)</li>
  <li>read the cell block into Pandas DataFrame</li>
  <li>do stuff with Pandas</li>
  <li>Write the resulting DataFrame back to the same Excel file, to a location defined by another named cell</li>
  <li>Preserving the charts and formula of the Excel file</li>
  </ol>