参考地址：http://www.verydemo.com/demo_c122_i18580.html
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Bird.__init__(self)
....................................................................
def sing(self):
print self.sound
self.hungry = True
def eat(self):
if self.hungry:
self.hungry = False
else:
print 'No, thanks!'
super(SongBird, self).__init__()
....................................................................
def sing(self):
print self.sound
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