Inheriting from Python list object(type?)

Mangabasi mangabasi at gmail.com
Wed May 23 14:31:56 EDT 2007


On May 23, 12:47 pm, "Jerry Hill" <malaclyp... at gmail.com> wrote:
> On 23 May 2007 09:58:36 -0700, Mangabasi <mangab... at gmail.com> wrote:
>
> > There must be a way to inherit from the list type without having to
> > redefine all the methods and attributes that regular lists have.
>
> Like this:
>
> class Point(list):
>     def __init__(self, x, y, z = 1):
>         list.__init__(self, [x, y, z])
>
>     def __getattr__(self, name):
>         if name == 'x': return self[0]
>         if name == 'y': return self[1]
>         if name == 'z': return self[2]
>
>     def __setattr__(self, name, value):
>         if name == 'x': self[0] = value
>         if name == 'y': self[1] = value
>         if name == 'z': self[2] = value
>
> Does that show you what you need?
>
> --
> Jerry

Somebody else emailed me another solution.

This is what he suggested:

class Point(list):
    def __init__(self,x,y):
        super(Point, self).__init__()
        self.x = x
        self.y = y

When I modified this to:

class Point(list):
    def __init__(self,x,y):
        super(Point, self).__init__([x, y])
        self.x = x
        self.y = y

It worked.





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