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I changed your code to work with python 3.6.
I also made some changes to make the code more readable (in my opinion, feel free to disagree)
Furthermore, I converted it to a class (pymorphit_cls.py), as this better suited my personal needs.
As a small example of my personal need, I added process_italianprep.py (not a useful script, but serves well as example).
Finally, I added some comments to make the code clear.