#!/usr/local/bin/python

# A really cool example: Uses a set to generate non-repeating "random" numbers
# Note the use of random, sets, and exceptions


import random

def random_norep(low,high):

   candidate = random.randint(low,high)
   used = set ([ candidate ])   # Note the syntax, we haven't used sets much

   yield candidate

   while ( ((high-low)+1) > len(used)):
       candidate = random.randint(low,high)
       if (candidate in used): 
           continue

       used.add(candidate)
       yield candidate


rands = random_norep(0,9)

print rands.next()
print rands.next()
print rands.next()

"""
try:
    while True:
        print rands.next()
except StopIteration:
    print "All done -- we've used all of the numbers in the requested range."
"""