Simple example of a choropleth map with python and Folium Uses python 3.7 with folium and pandas libraries.
The result is a map of ile de France region's cities, showing cities population densities with a color code.
Data come from Ile de France Region open data repository
shapefile : https://data.iledefrance.fr/explore/dataset/communes-dile-de-france-au-01-janvier/export/
population density : https://data.iledefrance.fr/explore/dataset/metropole-densites-de-population-par-commune/information/