Inkscape's Python gives you issues

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Inkscape comes with Python as part of it's installation. In most cases this works well but on one of my Windows laptop, it gave me an error saying that PySerial was missing.

Adafruit has a nice and succinct description how to install this, way better than I can describe it: here it is https://learn.adafruit.com/arduino-lesson-17-email-sending-movement-detector/installing-python-and-pyserial