Re: Basic misunderstanding on object creation

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From	Terry Reedy <tjreedy@udel.edu>
Subject	Re: Basic misunderstanding on object creation
Date	Wed, 13 May 2015 13:05:54 -0400
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On 5/13/2015 12:38 PM, Mark Lawrence wrote:

> I'm completely convinced that I've seen a change go through on the bug
> tracker that impacts on this area, but many months if not years ago.
> Unfortunately searching the bug tracker for super, __new__, __init__ and
> so on gets a lot of hits, leaving my Mk1 eyeballs overworked.  At least
> I've tried but sorry, had to give up :(

 From my post, sent while you were composing this. (It took me awhile to 
find it.)

Bugfixes break code that depends on buggy behavior. See
https://bugs.python.org/issue1683368
Your code also fails in 2.7.9 if you inherit Foo from object.
The exact error messages changed for 3.4 in
https://bugs.python.org/issue7963

(Found by searching https://docs.python.org/3.4/whatsnew/changelog.html
for 'object'. selecting 'Highlight All', and scanning Core and Builtins 
sections. I believe the change went into some 2.7.x release, as well as 
3.3.0a1)
-- 
Terry Jan Reedy

Thread

Basic misunderstanding on object creation andrew cooke <andrew@acooke.org> - 2015-05-13 06:25 -0700
  Re: Basic misunderstanding on object creation Thomas Rachel <nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915@spamschutz.glglgl.de> - 2015-05-13 16:24 +0200
    Re: Basic misunderstanding on object creation andrew cooke <andrew@acooke.org> - 2015-05-13 07:42 -0700
      Re: Basic misunderstanding on object creation andrew cooke <andrew@acooke.org> - 2015-05-13 07:45 -0700
        Re: Basic misunderstanding on object creation Peter Otten <__peter__@web.de> - 2015-05-13 16:55 +0200
        Re: Basic misunderstanding on object creation Ian Kelly <ian.g.kelly@gmail.com> - 2015-05-13 08:55 -0600
          Re: Basic misunderstanding on object creation andrew cooke <andrew@acooke.org> - 2015-05-13 08:52 -0700
      Re: Basic misunderstanding on object creation Ian Kelly <ian.g.kelly@gmail.com> - 2015-05-13 08:54 -0600
  Re: Basic misunderstanding on object creation Terry Reedy <tjreedy@udel.edu> - 2015-05-13 12:36 -0400
    Re: Basic misunderstanding on object creation andrew cooke <andrew@acooke.org> - 2015-05-13 11:42 -0700
      Re: Basic misunderstanding on object creation Terry Reedy <tjreedy@udel.edu> - 2015-05-13 15:17 -0400
      Re: Basic misunderstanding on object creation Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-05-13 20:45 +0100
        Re: Basic misunderstanding on object creation Ned Batchelder <ned@nedbatchelder.com> - 2015-05-13 13:33 -0700
          Re: Basic misunderstanding on object creation Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-05-14 11:07 +1000
  Re: Basic misunderstanding on object creation Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-05-13 17:38 +0100
  Re: Basic misunderstanding on object creation Terry Reedy <tjreedy@udel.edu> - 2015-05-13 13:05 -0400
  Re: Basic misunderstanding on object creation Terry Reedy <tjreedy@udel.edu> - 2015-05-13 13:13 -0400
  Re: Basic misunderstanding on object creation Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-05-13 18:43 +0100

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