@classmethod
    def has(cls, key):
        return key in cls.get_all()
The size of a node if the number of children it has.
dataset/ETHPy150Open vinyll/django-imagefit/imagefit/models.py/Presets.has--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.4/django/utils/tree.py/Node.__len__