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I am new to Python programing language. I have created the codes, based on this solution.
I prepared two simple programs:
import simplekml
List2 = [ [ 'Placemark','old file', 51.500152, -0.126236 ] ] # description, lat, lon
List3 = [ [ 'New placemark','new file', 51.600152, -0.136236 ] ]
kml ...