"""
this is a partial solution: need to augment to allow
subclasses to set private self attributes, and use
__getattr__ and wrapper/proxy class for attr fetches
"""

class PrivateExc(Exception): pass

class Privacy:
    def __setattr__(self, attrname, value):      # on self.attrname = value
        if attrname in self.privates:
            raise PrivateExc(attrname, self)
        else:
            self.__dict__[attrname] = value      # self.attrname = value loops!

class Test1(Privacy):
    privates = ['age']

class Test2(Privacy):
    privates = ['name', 'pay']
    def __init__(self):
        self.__dict__['name'] = 'Tom'

x = Test1()
y = Test2()

x.name = 'Bob'
#y.name = 'Sue'   # <== fails
y.age  = 30
x.age  = 40      # <== fails