#!/usr/bin/env python


class A(object):
    def __init__(self):
        self.A = 'a'
        self.B = 'b'


class B(object):
    def __init__(self,AA):
        self.AA = AA
    def set(self):
        self.AA.A = 'c'

class C(object):
    def __init__(self,AA,LIST):
        self.AA = AA
        self.LIST = LIST
    def disp(self):
        print "displaying from one class ",self.AA.A,"  ",self.AA.B
        print "are variables linked? :",self.LIST[0] is self.AA.A



if __name__ == '__main__':
    tmp1 = A()
    tmp_list = [tmp1.A,tmp1.B]
    tmp2 = B(tmp1)
    tmp3 = C(tmp1,tmp_list)

    tmp3.disp()
    tmp2.set()
    tmp3.disp()