python 3 is not compatible. You should use IronPython. And if you use Python 2.7.x you should be aware of that some parts like numPy are not working. I have created a small tutorial for my customers, it is in german but I think with an translator u can follow: https://www.enjoybim.de/2019/01/18/mit-intellisense-dynamobim-custom-nodes-erstellen/