class Critter(object):
    '''A virtual pet'''
    def init(self, name):
        print 'A new critter has been born!'
        self.__name = name


def get_name(self):
    return self.__name

def set_name(self, new_name):
    if new_name == '':
        print 'A critter's name can't be the empty string.'
    else:
        self.__name = new_name
        print 'Name change successful.'

name = property(get_name, set_name)

def talk(self):
    print '\nHi, I'm', self.name


main
crit = Critter('Poochie')
crit.talk()
print '\nMy critter's name is:',
print crit.name
print '\nAttempting to change my critter's name.'
crit.name = ''
print '\nAttempting to change my critter's name again.'
crit.name = 'Randolph'
crit.talk()
</pre>