Inheritance question

[Hrvoje Niksic]

Tzury Bar Yochay <Afro.Systems at gmail.com> writes:

> given two classes:
>
> 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 = Foo.getid()
>         b = self.id
>         return '%d.%d' % (a,b)

Try this:

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 = Foo.getid(self)
        b = self.__id
        return '%d.%d' % (a,b)

>>> FooSon().getid()
'1.2'

> While my intention is to get 1.2 I get 2.2 I would like to know what
> would be the right way to yield the expected results

Either use the above "private" fields, or emulate them yourself by
renaming self.id to self.foo_id or self.foo_son_id, and exposing those
in the class.  Or you can have a class-specific dict in each instance,
and so on.