Chaz Ginger wrote:
> Chaz Ginger wrote:
> > glenn wrote:
> >> hi - Im quite new to python, wondering if anyone can help me understand
> >> something about inheritance here. In this trivial example, how could I
> >> modify the voice method of 'dog' to call the base class 'creatures'
> >> voice method from with in it?
> >>
> >> class creature:
> >> def __init__(self):
> >> self.noise=""
> >> def voice(self):
> >> return "voice:" + self.noise
> >>
> >> class dog(creature):
> >> def __init__(self):
> >> self.noise="bark"
> >>
> >> def voice(self):
> >> print "brace your self:"
>
> I did forget to mention that in 'dog"s' __init__ you had better call
> creature's __init__. You might make it look like this:
>
> def __init__(self):
> self.noise = 'bark'
> creature.__init__(self)
>
There's a problem with Chaz's __init__() method. Notice that the
creature class's __init__ sets self.noise to the empty string. In this
case, the superclass's __init__() method should be called first:
class dog(creature):
def __init__(self):
creature.__init__(self)
self.noise = "bark"
def voice(self):
print "brace your self:"
creature.voice(self)
--Jason
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