Trecho de código para ler os dados contidos no arquivo KML para popular o GoogleMaps.

LendoKMLGoogleMaps.py

def process_file_kml(sender, created, instance, **kwargs):
    try:
        if created:
            xmldoc = minidom.parse(instance.shape_file)
            document_name = \
                xmldoc.getElementsByTagName("kml")[0].getElementsByTagName("Document")[0].getElementsByTagName("name")[
                    0]
            type_shape = None
            for place in xmldoc.getElementsByTagName("Placemark"):
                name_place = place.getElementsByTagName("name")[0].firstChild.data
                type_element = str(place.getElementsByTagName("styleUrl")[0].firstChild.data)

                if type_element.find("PolyStyle") == 1:
                    # TODO Verificar como recuperar todos os elementos Polygon
                    type_shape = "Polygon"
                    for polygon in place.getElementsByTagName("Polygon"):
                        coordinates = \
                            polygon.getElementsByTagName("outerBoundaryIs")[0].getElementsByTagName("LinearRing")[
                                0].getElementsByTagName("coordinates")[0]

                        list_coordinates = coordinates.firstChild.data.strip()
                        Placemark.objects.create(shape=instance,
                                                 name=name_place,
                                                 coordinate=list_coordinates, type_shape=type_shape)

                elif type_element.find("LineStyle") == 1:
                    coordinates = place.getElementsByTagName("LineString")[0].getElementsByTagName("coordinates")[0]
                    type_shape = "Line"

                    list_coordinates = coordinates.firstChild.data.strip()
                    Placemark.objects.create(shape=instance,
                                             name=name_place,
                                             coordinate=list_coordinates, type_shape=type_shape)

                elif type_element.find("IconStyle") == 1:
                    coordinates = place.getElementsByTagName("Point")[0].getElementsByTagName("coordinates")[0]
                    type_shape = "Point"

                    list_coordinates = coordinates.firstChild.data.strip()
                    Placemark.objects.create(shape=instance,
                                             name=name_place,
                                             coordinate=list_coordinates, type_shape=type_shape)

                instance.name = document_name.firstChild.data
                instance.type_shape = type_shape
                instance.save(force_update=True)
    except Exception, e:
        print e