#!/usr/bin/env python
     # encoding: utf-8
     #
     # Copyright (c) 2009 Doug Hellmann All rights reserved.
     #
     """
     """
     #end_pymotw_header
     
     import abc
     
     class Base(object):
         __metaclass__ = abc.ABCMeta
         
         @abc.abstractproperty
         def value(self):
             return 'Should never get here'
     
     
     class Implementation(Base):
         
         @property
         def value(self):
             return 'concrete property'
     
     
     try:
         b = Base()
         print 'Base.value:', b.value
     except Exception, err:
         print 'ERROR:', str(err)
     
     i = Implementation()
     print 'Implementation.value:', i.value