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From: "Prasad, Ramit" <ramit.prasad@jpmorgan.com>
To: "python-list@python.org" <python-list@python.org>
Subject: RE: data attributes override method attributes?
Thread-Topic: data attributes override method attributes?
Thread-Index: AQHNmy2fx+iO8l32NkO+geClnPNL35ebanYAgABSfACAAAKqAIAAB1UAgARIStA=
Date: Fri, 28 Sep 2012 18:02:04 +0000
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Xref: csiph.com comp.lang.python:30420

Terry Reedy wrote:=0D=0A> On 9/25/2012 4:07 PM, Ian Kelly wrote:=0D=0A> > O=
n Tue, Sep 25, 2012 at 1:58 PM, Terry Reedy <tjreedy@udel=2Eedu> wrote:=0D=
=0A> >> On 9/25/2012 11:03 AM, Chris Angelico wrote:=0D=0A> >>> Instance at=
tributes override (shadow) class attributes=2E=0D=0A> >>=0D=0A> >>=0D=0A> >=
> except for (some? all?) special methods=0D=0A> >=0D=0A> > Those names are=
 shadowed too=2E  If you call foo=2E__len__() and the name=0D=0A> > is boun=
d on the instance, it will call that function preferentially=2E=0D=0A> > It=
's just that when the special Python machinery calls the method, it=0D=0A> =
> skips the instance and goes straight to the class=2E=0D=0A> =0D=0A> I add=
ed "Ian Kelly reminds me that instance=2E__xxx__ is only skipped by=0D=0A> =
the internal machinery and not by direct accesses in user code=2E In the=0D=
=0A> other hand, docs, official or otherwise, are filled with things like=
=0D=0A> 'len(a) calls a=2E__len__', so I think something should be said tha=
t=0D=0A> giving instances special method attributes does not have the effec=
t one=0D=0A> might expect=2E"=0D=0A> =0D=0A> to the issue=2E=0D=0A> =0D=0A=
=0D=0A=0D=0AJust to make sure I am following, if you call=0D=0Afoo=2E__len_=
_() it goes to the instance code while=0D=0Aif you do len(foo) it will go t=
o class=2E__len__()?=0D=0A=0D=0AIf so, why? =0D=0A=0D=0AThis email is confi=
dential and subject to important disclaimers and=0D=0Aconditions including =
on offers for the purchase or sale of=0D=0Asecurities, accuracy and complet=
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s/disclosures/email=2E