Python 3 Deep Dive Part 4 Oop High Quality -
def __set__(self, obj, value): if not isinstance(value, (int, float)): raise TypeError("Value must be a number") setattr(obj, self.storage_name, value)
def __set__(self, obj, value): if not isinstance(value, (int, float)): raise TypeError("Value must be a number") setattr(obj, self.storage_name, value)