On Fri, Feb 11, 2022 at 5:39 AM Steven D'Aprano <st...@pearwood.info> wrote:
> On Thu, Feb 10, 2022 at 02:27:42PM -0800, Neil Girdhar wrote:
>
> > AttributeError: can't set attribute 'f'
> >
> > This can be a pain to debug when the property is buried in a base class.
>
> > Would it make sense to mention the reason why the attribute can't be
> set,
> > namely that it's on a property without a setter?
>
> I have no objection to changing the error message, I'm sure it's a small
> enough change that you should just open a ticket on b.p.o. for it. But I
> don't expect that it will be particularly useful either.
>
> If you can't set an attribute on an object, aren't there three obvious
> causes to check?
>
obvious? See below.
>
> - the object has no __dict__, and so has no attributes at all;
> e.g. trying to set an attribute on a float;
>
> - the object has slots, but 'f' is not one of them;
>
> - or 'f' is a property with no setter (or a setter that raises
> AttributeError).
>
> Have I missed any common cases?
>
>>> Point = namedtuple('point', ('x', 'y'))
>>> p = Point(2, 3)
>>> p.x = 4
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
AttributeError: can't set attribute
Would this qualify as "obvious"?
<snip>
>
> Maybe reporting "can't set property 'f'" is good enough.
>
> +1
André
>
> --
> Steve
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