def transition(self, *args, **kwargs):
        self.system.transition(*args, **kwargs)
The number of interior rings in this Polygon.
dataset/ETHPy150Open chop-dbhi/django-sts/sts/models.py/STSModel.transition--crossover with--dataset/ETHPy150Open django/django/django/contrib/gis/gdal/geometries.py/Polygon.__len__