def __len__(self):
        return self.num_fields
:param goal: Input expression to prove
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.2/django/contrib/gis/gdal/feature.py/Feature.__len__--crossover with--dataset/ETHPy150Open nltk/nltk/nltk/inference/prover9.py/Prover9Command.__init__