Path: csiph.com!x330-a1.tempe.blueboxinc.net!usenet.pasdenom.info!gegeweb.org!de-l.enfer-du-nord.net!feeder1.enfer-du-nord.net!feeds.phibee-telecom.net!newsfeed.xs4all.nl!newsfeed5.news.xs4all.nl!xs4all!newsgate.cistron.nl!newsgate.news.xs4all.nl!post.news.xs4all.nl!not-for-mail
Return-Path: <rosuav@gmail.com>
X-Original-To: python-list@python.org
Delivered-To: python-list@mail.python.org
X-Spam-Status: OK 0.008
X-Spam-Evidence: '*H*': 0.98; '*S*': 0.00; 'function,': 0.07; 'python': 0.08; 'oh,': 0.09; 'received:209.85.214.174': 0.13; 'method.': 0.15; '3.2,': 0.16; 'from:addr:rosuav': 0.16; 'from:name:chris angelico': 0.16; 'hex': 0.16; 'hint:': 0.16; 'relied': 0.16; 'unbound': 0.16; 'wrote:': 0.18; '>>>': 0.18; 'seems': 0.20; 'trying': 0.21; 'header:In-Reply-To:1': 0.22; 'feb': 0.22; "shouldn't": 0.23; 'windows': 0.26; 'function': 0.27; 'tried': 0.27; 'beyond': 0.28; 'message-id:@mail.gmail.com': 0.29; 'anyway.': 0.29; 'example': 0.29; "skip:' 10": 0.29; 'print': 0.29; 'seem': 0.29; 'pm,': 0.29; 'none,': 0.30; 'objects.': 0.30; 'thu,': 0.32; 'actual': 0.32; 'object': 0.33; 'anything': 0.34; 'to:addr:python-list': 0.35; 'received:209.85.214': 0.36; 'question': 0.36; 'two': 0.36; 'but': 0.37; 'received:google.com': 0.37; 'difference': 0.38; 'received:209.85': 0.38; 'could': 0.38; 'skip:\xa0 10': 0.39; 'received:209': 0.39; 'being': 0.40; 'might': 0.40; 'to:addr:python.org': 0.40; 'more': 0.61; 'your': 0.61; 'special': 0.66; 'exact': 0.68; 'anything.': 0.71
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type:content-transfer-encoding; bh=pfbspSXj1fzQNoqSy1gRK+0SOvT9btf18h2J8fKI7Sw=; b=JrrD0UcI7zgqrjeinpUhv00I/yMu+j3dyLfn1Ss1AUG40nMbXucjpRU47COo/0U249 65xZrXGqYrC5PpoGbF0DQFAtzQdY0NX+vE/VZ3zOKF9H/Kl2nhWWu/9rQt4liW/4zXPy pLeMSz4GMH1YXzdEnC7Rqm4rB8ecF2u2RqK+c=
MIME-Version: 1.0
In-Reply-To: <CAOypoo4V+KjSxieUM3jU1UO==2nDHuRyzk0Byi8rf3L3YG37eg@mail.gmail.com>
References: <CAOypoo4V+KjSxieUM3jU1UO==2nDHuRyzk0Byi8rf3L3YG37eg@mail.gmail.com>
Date: Thu, 9 Feb 2012 15:06:21 +1100
Subject: Re: Id of methods
From: Chris Angelico <rosuav@gmail.com>
To: python-list@python.org
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable
X-BeenThere: python-list@python.org
X-Mailman-Version: 2.1.12
Precedence: list
List-Id: General discussion list for the Python programming language <python-list.python.org>
List-Unsubscribe: <http://mail.python.org/mailman/options/python-list>, <mailto:python-list-request@python.org?subject=unsubscribe>
List-Archive: <http://mail.python.org/pipermail/python-list>
List-Post: <mailto:python-list@python.org>
List-Help: <mailto:python-list-request@python.org?subject=help>
List-Subscribe: <http://mail.python.org/mailman/listinfo/python-list>, <mailto:python-list-request@python.org?subject=subscribe>
Newsgroups: comp.lang.python
Message-ID: <mailman.5561.1328760384.27778.python-list@python.org>
Lines: 62
NNTP-Posting-Host: 2001:888:2000:d::a6
X-Trace: 1328760384 news.xs4all.nl 6937 [2001:888:2000:d::a6]:49773
X-Complaints-To: abuse@xs4all.nl
Xref: x330-a1.tempe.blueboxinc.net comp.lang.python:20045

On Thu, Feb 9, 2012 at 2:48 PM, Emeka <emekamicro@gmail.com> wrote:
> I am trying to see if I could get more of Python without being insane.

Oh, I thought insanity was a prerequisite... anyway.

> print Boo.__dict__
>
> {'__module__': '__main__', 'ball': <function ball at 0x286e9b0>, 'daf':
> <function daf at 0x286e938>, '__dict__ ......}
>
> print =A0hex(id(Boo.daf))
> 0x27de5a0
>
> My question is why is it that the id of Boo.daf =A0is different from daf'=
s hex
> value in the above dict?

Take no notice of the exact value of id(). It is an opaque value that
shouldn't be relied upon for anything.

That said, though, I tried your example in my two Windows Pythons,
2.6.5 and 3.2; in 3.2, the behavior is most like what you seem to be
accepting:

>>> Boo.__dict__
dict_proxy({'__module__': '__main__', 'ball': <function ball at
0x00FCBCD8>, 'daf': <function daf at 0x00FCBC90>, '__dict__':
<attribute '__dict__' of 'Boo' objects>, '__weakref__': <attribute
'__weakref__' of 'Boo' objects>, '__doc__': None, '__init__':
<function __init__ at 0x00FCBC48>})
>>> hex(id(Boo.daf))
'0xfcbc90'
>>> Boo.daf
<function daf at 0x00FCBC90>

Same number everywhere. But 2.6.5 has a difference that might give you a hi=
nt:

>>> print Boo.__dict__
{'__module__': '__main__', 'ball': <function ball at 0x011BDC70>,
'daf': <function daf at 0x011BDC30>, '__dict__': <attribute '__dict__'
of 'Boo' objects>, '__weakref__': <attribute '__weakref__' of 'Boo'
objects>, '__doc__': None, '__init__': <function __init__ at
0x011BDBB0>}
>>> Boo.daf
<unbound method Boo.daf>

daf is not a function, it's a special object for an unbound method.
The exact identity of it is not necessarily useful; and buried inside
it is the actual function that you defined:

>>> hex(id(Boo.daf))
'0x11b5c10'
>>> hex(id(Boo.daf.im_func))
'0x11bdc30'

And that seems to be the number that's given in the repr().

But mainly, don't rely on id() for anything beyond uniqueness against
all current objects.

ChrisA