Inheritance question

[Brian Lane]

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Gerard Flanagan wrote:

> Use the child class when calling super:
> 
> --------------------------------------
> class Foo(object):
>     def __init__(self):
>         self.id = 1
> 
>     def getid(self):
>         return self.id
> 
> class FooSon(Foo):
>     def __init__(self):
>         Foo.__init__(self)
>         self.id = 2
> 
>     def getid(self):
>         a = super(FooSon, self).getid()
>         b = self.id
>         return '%d.%d' % (a,b)
> 
> print FooSon().getid()
> --------------------------------------

That still doesn't do what he's trying to do.

The problem here is that you only have one instance. self refers to it,
so when you set self.id in the super you have set the instance's id to
1. When you set it to 2 after calling the super's __init__ you are now
setting the *same* variable to a 2.

Basically, you can't do what you are trying to do without using a
different variable, or keeping track of a separate instance for the
super instead of sub-classing it.

Brian

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