[Python-Dev] Type/class differences (Re: Sets: elt in dict, lst.include)
Neil Schemenauer
nas@arctrix.com
Mon, 5 Feb 2001 11:04:22 -0800
On Mon, Feb 05, 2001 at 01:37:39PM -0500, Guido van Rossum wrote:
> Now, can you do things like this:
[example cut]
No, it would have to be written like this:
>>> from types import *
>>> class MyInt(IntType): # add a method
def add1(self): return self.value+1
>>> i = MyInt(10)
>>> i.add1()
11
>>>
Note the value attribute. The IntType.__init__ method is
basicly:
def __init__(self, value):
self.value = value
> > PyObject {
> > int ob_refcnt;
> > PyClass ob_class;
>
> (plus type-specific fields I suppose)
Yes, the instance attributes. In this scheme all objects are
instances of some class.
> Yeah... Like you should be able to ask for ListType.append and get an
> unbound built-in method back, which can be applied to a list:
>
> ListType.append([], 1) === [].append(1)
Right. My changes on the weekend where quite close to making
this work.
Neil