[Python-3000] object.__hash__()

[Steven Bethard]

On 7/27/06, Guido van Rossum <guido at python.org> wrote:
> On 7/27/06, Steven Bethard <steven.bethard at gmail.com> wrote:
> > If I understand the problem right, the reason for not wanting to
> > remove __hash__ from object  is that it's often convenient to have a
> > dict or set where objects are compared by id() instead of by value.
>
> No, not at all. This is for objects whose __eq__ is also the default
[snip]

So what's the problem with losing the default hash then?  I thought
the default hash was basically just hash(id(obj))::

    >>> class C(object):
    ...     pass
    ...
    >>> hash(C)
    13565672
    >>> hash(id(C))
    13565672
    >>> c = C()
    >>> hash(c)
    15130928
    >>> hash(id(c))
    15130928

If object.__hash__() disappeared, the hash(obj) versions would fail,
but the same results seem to be available as hash(id(obj)).

Steve
-- 
I'm not *in*-sane. Indeed, I am so far *out* of sane that you appear a
tiny blip on the distant coast of sanity.
        --- Bucky Katt, Get Fuzzy