#!/usr/bin/env python
     # encoding: utf-8
     #
     # Copyright (c) 2010 Doug Hellmann.  All rights reserved.
     #
     """Use total_ordering decorator to fill in missing rich comparison methods.
     """
     #end_pymotw_header
     
     import functools
     
     class MyObject(object):
         def __init__(self, val):
             self.val = val
         def __str__(self):
             return 'MyObject(%s)' % self.val
     
     def compare_obj(a, b):
         """Old-style comparison function.
         """
         print 'comparing %s and %s' % (a, b)
         return cmp(a.val, b.val)
     
     # Make a key function using cmp_to_key()
     get_key = functools.cmp_to_key(compare_obj)
     
     def get_key_wrapper(o):
         """Wrapper function for get_key to allow for print statements.
         """
         new_key = get_key(o)
         print 'key_wrapper(%s) -> %s' % (o, new_key)
         return new_key
             
     objs = [ MyObject(x) for x in xrange(5, 0, -1) ]
     
     for o in sorted(objs, key=get_key_wrapper):
         print o