#!/usr/bin/env python
 
import types
 
def method_property(name):
    def getter(self):
        return getattr(self, name)
    def setter(self, value):
        setattr(self, name, types.MethodType(value, self))
    return getter, setter
 
class Duck(object):
    def __init__(self, fly, quack):
        self.fly = fly
        self.quack = quack
 
    quack = property(*method_property("_quack"))
    fly = property(*method_property("_fly"))
 
    def swim(self):
        print "All ducks float, even decoys!"
 
class MallardDuck(Duck):
    def __init__(self):
        Duck.__init__(self, fly, quack)
        print "I'm a real Mallard Duck"
 
class ModelDuck(Duck):
    def __init__(self):
        Duck.__init__(self, fly_no_way, squeak_quack)
        print "I'm a Model Duck"
 
class DecoyDuck(Duck):
    def __init__(self):
        Duck.__init__(self, fly_no_way, mute_quack)
        print "I'm a Decoy Duck"
 
def fly(self):
    print "I'm flying!!"
 
def fly_no_way(self):
    print "I can't fly"
 
def fly_rocket_powered(self):
    print "I'm flying with a rocket!"
 
def quack(self):
    print "Quack"
 
def mute_quack(self):
    print "<< Silence >>"
 
def squeak_quack(self):
    print "Squeak"
 
if __name__ == "__main__":
 
    print '#'*80
    print "Mallard Duck"
    print '#'*80
    mallard = MallardDuck()
    mallard.quack()
    mallard.fly()
 
    print '#'*80
    print "Model Duck"
    print '#'*80
    model = ModelDuck()
    model.fly()
    model.fly = fly_rocket_powered
    model.fly()
 
    print '#'*80
    print "Decoy Duck"
    print '#'*80
    decoy = DecoyDuck()
    decoy.fly()
    decoy.quack()

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