[Tutor] empty class methods

[david]

class foo:
    def sayhi(self):
        print 'hello world'
    def saybye(self): ##is there any reason for this to be here?
        pass

class bar(foo):
    def saybye(self):
        print 'bye now'

class baz(foo):
    def saybye(self):
        print 'later tater'

x = foo()
y = bar()
z = baz()

x.sayhi()
y.sayhi()
y.saybye()
z.sayhi()
z.saybye()
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