[moving to python-dev]
Alex Martelli wrote:
> Georg Brandl <g.brandl-nospam at gmx.net> wrote:
>
>> can someone please tell me that this is correct and why:
>
> IMHO, it is not correct: it is a Python bug (and it would be nice to fix
> it in 2.5).
Fine. Credits go to Michal Kwiatkowski for discovering that in bug #1448042
which I closed out of ignorance ;)
>> >>> class C(object):
>> ... pass
>> ...
>> >>> c = C()
>> >>> c.a = 1
>> >>> c.__dict__
>> {'a': 1}
>> >>> c.__dict__ = {}
>> >>> c.a
>> Traceback (most recent call last):
>> File "<stdin>", line 1, in ?
>> AttributeError: 'C' object has no attribute 'a'
>
> So far so good, I think we agree;-).
Yes.
>> >>> class D(object):
>> ... __dict__ = {}
>> ...
>> >>> d = D()
>> >>> d.a = 1
>> >>> d.__dict__
>> {}
>> >>> d.__dict__ = {}
>> >>> d.a
>> 1
>
> Yep, that's the bug, fully reproducible in 2.3 and 2.4. FWIW, mucking
> around with gc.getreferrers (with a more uniquely identifiable value for
> d.a;-) shows a dictionary "somewhere" with keys 'a' and '__dict__'...
Georg
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