Inheriting from Python list object(type?)

[Mangabasi]

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

Hi Jerry,

It is very close.  It worked for many operations except when I tried

>>> from numpy import array
>>> p = Point(4,5)
>>> a = array(p)
Traceback (most recent call last):
  File "<input>", line 1, in ?
ValueError: invalid __array_struct__
>>> a = array([4, 5, 1])
>>>


I can define an __array__ method for this to work but I am wondering
if we can make this
behave like a real list?

Thanks for your help.