see parameters of a descriptor

descriptor.py

class Attribute(object):

    def __init__(self, param=None, name='default'):
        self.param = param
        self.name = name

    def __get__(self, instance, objtype):
        return getattr(instance, self.get_private_name())

    def __set__(self, instance, val):
        setattr(instance, self.get_private_name(), val)

    def get_private_name(self):
        return '_' + self.name


class Sample(object):

    attr1 = Attribute(name='attr1', param=100)
    attr2 = Attribute(name='attr2', param=200)

    def __init__(self):
        print('Sample::__init__() was called')


if __name__ == '__main__':
    s = Sample()
    print(vars(vars(Sample)['attr1']))
    print(vars(vars(Sample)['attr2']))