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Emulating Privacy for Instance Attributes

class PrivateExc(Exception): pass                  class Privacy:     def __setattr__(self, attrname, value):               if attrname in self.privates:             raise PrivateExc(attrname, self)         else:             self.__dict__[attrname] = value       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