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To: python-list@python.org
From: Terry Reedy <tjreedy@udel.edu>
Subject: Re: data attributes override method attributes?
Date: Tue, 25 Sep 2012 16:34:12 -0400
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Xref: csiph.com comp.lang.python:30126

On 9/25/2012 4:07 PM, Ian Kelly wrote:
> On Tue, Sep 25, 2012 at 1:58 PM, Terry Reedy <tjreedy@udel.edu> wrote:
>> On 9/25/2012 11:03 AM, Chris Angelico wrote:
>>> Instance attributes override (shadow) class attributes.
>>
>>
>> except for (some? all?) special methods
>
> Those names are shadowed too.  If you call foo.__len__() and the name
> is bound on the instance, it will call that function preferentially.
> It's just that when the special Python machinery calls the method, it
> skips the instance and goes straight to the class.

I added "Ian Kelly reminds me that instance.__xxx__ is only skipped by 
the internal machinery and not by direct accesses in user code. In the 
other hand, docs, official or otherwise, are filled with things like 
'len(a) calls a.__len__', so I think something should be said that 
giving instances special method attributes does not have the effect one 
might expect."

to the issue.


-- 
Terry Jan Reedy