PySerial missing on the MAC

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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 laptops, it gave me an error saying that PySerial was missing.

Adafruit has a nice and succinct description how to install this on a MAC, 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