Cannot import psse34 in python 3.9 (or any other version of python)

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Latest PSSe34 allows use of Python 3.9. Check the post "Python 3.7 w/ PSSE 34" for PSSe v.34 + python 3.7.

The module "psse34" when imported, sets paths to access PSSe python modules like psspy, dyntools, located in subfolders within the PSSe installation folder:

subfolder psspy27 - to be used with python 2.7
subfolder psspy34 - to be used with python 3.4 
subfolder psspy37 - to be used with python 3.7 
subfolder psspy39 - to be used with python 3.9