gistfile1.py

#!python

import random

def rnd04():
  return random.randint(0,4);

def rnd03():
  rnd = rnd04()
  while rnd > 3:
    rnd = rnd04()
  return rnd

def rnd07():
  return (rnd03()>>1) + (rnd03()<<1)

def rnd06():
  rnd = rnd07()
  while rnd > 6:
    rnd = rnd07()
  return rnd

if __name__ == '__main__':
  dist = {}

  for i in range(1000):
    ind = rnd06()
    dist[ind] = dist.get(ind, 0) + 1

  print dist