hatchd.py

class DataDescriptor:

    def __init__(self, name):
        self.name = name

    def __get__(self, obj, objtype=None):
        if obj:
            return obj.__dict__[self.name]
        else:
            return self

    def __set__(self, obj, value):
        obj.__dict__[self.name] = value


class Queryable(type):
    def __new__(cls, name, bases, attrs):
        

        for k, v in attrs.items():
            if isinstance(v, DataDescriptor):
                v.name = k
                
        result = type.__new__(cls, name, bases, dict(attrs))
        return result


class Order(metaclass=Queryable):
    item_count = DataDescriptor()
    cost = DataDescriptor()


if __name__ == '__main__':
    print(Order.__dict__)
    
# Run gives:
# Traceback (most recent call last):
#   File "hatchd.py", line 31, in <module>
#     class Order:
#   File "hatchd.py", line 32, in Order
#     item_count = DataDescriptor()
# TypeError: __init__() missing 1 required positional argument: 'name'