python - Getting to parent property in subclasses that uses a baseclass -

i creating module need define bunch of objects used in same module.

my ultimate goal work;

m = mod() obj1 = m.t1('text') obj2 = m.t2(23) m.togheter(obj1, obj2) 

the problem have need keep track of id in subclasses. i've gotten far, gives me attributeerror: 'super' object has no attribute '_cid' return super(mod.modobj, self)._cid

class mod(object):     current_cid = 0      @property     def _cid(self):         c = self.current_cid         self.current_cid += 1         return c      def togheter(self, obj1, obj2):         # obj1.text , obj2.number here...         return true      class modobj(object):         @property         def _cid(self):             return super(mod.modobj, self)._cid      class t1(modobj):         def __init__(self, text):             self.text = text             print self._cid      class t2(modobj):         def __init__(self, number):             self.number = number             print self._cid  m = mod() m.t1('text') m.t2(23) print m.current_cid  # should return 2 

what wrong here? tried several other "trial , error" ways well, starting think doing wrong way...

modobj doesn't inherit mod; it's nested class inherits object, , object indeed not have property (or attribute) named _cid.