#!/usr/bin/python

import pickle
from pprint import *
from StringIO import *

class Node(object):
    def __init__(self, i):
	self.i = i

    def __cmp__(self, other):
	return cmp(self.i, other.i)

    def __hash__(self):
	return hash(self.i)

n = Node(12)
n.next_nodes = set((n,))

f = StringIO()
pickle.dump(n, f)
f1 = StringIO(f.getvalue())
n1 = pickle.load(f1)

pprint(n)
pprint(n1)

assert n == n1