Third Edition is on the shelves! Geospatial concepts, Geo-python universe, and pound-for-pound still the most pure-python and minimal-dependency examples you’ll find anywhere so somebody somewhere out there will still be able to do the math. I'm giving away a few eBook versions if you're willing to write a review on Amazon. DM me @SpatialPython with your name and email! https://bit.ly/35gm0xl