Openpyxl missing 'jdcal'

Question

I tried to install the openpyxl module, but during the installation it showed some errors with JDcall. When I then try to import it, I get this err

Answer 1

I managed to get openpyxl to work by uninstalling openpyxl, jdcall and et-xmlfile, then reinstalling all three, then upgrading all three.

Not sure why it works, and the error messages are still there, but I was able to successfully import openpyxl and create a workbook.