#!/usr/local/bin/python2 from collections import OrderedDict class C(object): def __init__(self, v=0): self.name = v l = [C(), C(1), C(2), C(3), C(4), C(5), C(6), C(7), C(8), C(9)] for i in xrange(20000): m = OrderedDict((j.name, j) for j in l) n = m.keys() c = m.values() print m, n, c