[Python-Dev] 2.2=>2.3 object.__setattr__(cls,attr,value)

Jeremy Hylton jeremy at alum.mit.edu
Tue Nov 18 23:07:22 EST 2003

On Tue, 2003-11-18 at 22:23, David Eppstein wrote:
> In 2.2 I was able to call object.__setattr__(cls,attr,value)
> where cls is a new-style type (first argument of a classmethod),
> and attr and value are the name and value of a class attribute I want to 
> create programmatically.  I just upgraded to 2.3 but now when I try it I 
> get
> >>> class foo(object):pass
> ... 
> >>> object.__setattr__(foo,'foo',None)
> Traceback (most recent call last):
>   File "<stdin>", line 1, in ?
> TypeError: can't apply this __setattr__ to type object
> Instead I apparently have to call
> >>> type(foo).__setattr__(foo,'foo',None)
> Anyway, my question: no harm done here because this was in undeployed 
> code and I've found a workaround, but shouldn't this have at least been 
> mentioned in "What's New in Python 2.3"?  Or maybe this is one of the 
> some-other-change-with-far-reaching-consequences things that was 
> mentioned and I just don't see the connection?

The change was reported on python-dev, but apparently got left out of
the NEWS file.  Here are the details:

I don't know that it does much good to change NEWS after the fact, but I
don't think there's anything more that can be done.


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