#!/usr/local/bin/python2
from copy import deepcopy

class C(object):
  def __init__(self):
    self.a = []

  def p(self):
    print id(self.a)

  def s(self, v):
    self.a = v
    v.r = self

c = C()
c.s(C())
c.a.s(C())
p = deepcopy(c.a.a.p)
c.p()
p.__self__.r.r.p()
c.a = 1
c.p()
p.__self__.r.r.p()