read_kml.py

from fastkml import kml
k = kml.KML()
k.from_string(open("data/48cb6f8ca308484097e6ed4720b27faa_1.kml").read())

# This map will be a dict of borough name -> shapely geometry
map = {}

doc = list(k.features())[0]

for folder in doc.features():
    for placemark in folder.features():
        # In my KML file, the name of the boundary is in the ExtendedData section
        # Irritatingly this wasn't exposed as a dict so I am building one here
        attr = {}
        for d in placemark.extended_data.elements[0].data:
            attr[d["name"]] = d["value"]
        # The KML file I used has this attribute for the borough name
        map[attr["CTYUA15NM"]] = placemark.geometry