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#!/usr/bin/env python

# encoding: utf-8

"""Show the objects with references to a given object.

"""

import gc

import pprint

class Graph(object):

def __init__(self, name):

self.name = name

self.next = None

def set_next(self, next):

print 'Linking nodes %s.next = %s' % (self, next)

self.next = next

def __repr__(self):

return '%s(%s)' % (self.__class__.__name__, self.name)

# Construct a graph cycle

one = Graph('one')

two = Graph('two')

three = Graph('three')

one.set_next(two)

two.set_next(three)

three.set_next(one)

print

print 'three refers to:'

for r in gc.get_referents(three):

pprint.pprint(r)