On May 23, 12:47 pm, "Jerry Hill" <[EMAIL PROTECTED]> wrote: > On 23 May 2007 09:58:36 -0700, Mangabasi <[EMAIL PROTECTED]> 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. -- http://mail.python.org/mailman/listinfo/python-list
