Inheriting from Python list object(type?)

[Mangabasi]

Howdy,

I would like to create a Point class that lets me use Point instances
like the following example.

>>> p = Point(3, 4)
>>> p.x
3
>>> p.y
4
>>> p.z
1
>>> p[0]
3
>>> p[1]
4
>>> p[1] = 5
>>> p.y
5
>>>

other than the x, y, z attributes, these instances should behave like
regular Python lists.  I have created something like :

class Point:
    def __init__(self, x, y, z = 1):
        self.list = [x, y, z]

    def __repr__(self):
        return str(self.list)

    def __str__(self):
        return str(self.list)

    def __getattr__(self, name):
        if name == 'x':
            return self.list[0]
        elif name == 'y':
            return self.list[1]
        elif name == 'z':
            return self.list[2]
        else:
            return self.__dict__[name]

    def __setattr__(self, name, value):
        if name == 'x':
            self.list[0] = value
        elif name == 'y':
            self.list[1] = value
        elif name == 'z':
            self.list[2] = value
        else:
            self.__dict__[name] = value

    def __getitem__(self, key):
         return self.list[key]

    def __setitem__(self, key, value):
            self.list[key] = value

    def __getslice__(self, i, j):
        return self.list[i : j]

    def __setslice__(self, i, j, s):
        self.list[i : j] = s

    def __contains__(self, obj):
        if obj in self.list:
            return True
        else:
            return False


There must be a way to inherit from the list type without having to
redefine all the methods and attributes that regular lists have.

i.e.

class Point(list):
   ...


Can someone provide an example?

Thanx in advance