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From: Roald de Vries on 5 Aug 2010 09:46
Hi all,

I'm trying to create a metaclass that keeps track of its objects, and
implement this as a collections.MutableMapping. That is, something
like this:


class type2(type, MutableMapping):
...

/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/
python2.6/abc.pyc in __new__(mcls, name, bases, namespace)
83 if getattr(value,
"__isabstractmethod__", False))
84 for base in bases:
---> 85 for name in getattr(base, "__abstractmethods__",
set()):
86 value = getattr(cls, name, None)
87 if getattr(value, "__isabstractmethod__",
False):

TypeError: Error when calling the metaclass bases
'getset_descriptor' object is not iterable


Anybody knows why? Every type is just an object, isn't it?

Thanks in advance, cheers,

Roald
From: Gabriel Genellina on 6 Aug 2010 06:13
En Thu, 05 Aug 2010 10:46:29 -0300, Roald de Vries <downaold(a)gmail.com>
escribi�:

> I'm trying to create a metaclass that keeps track of its objects, and
> implement this as a collections.MutableMapping. That is, something like
> this:
>
>
> class type2(type, MutableMapping):
> ...
>
> /opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/
> python2.6/abc.pyc in __new__(mcls, name, bases, namespace)
> 83 if getattr(value, "__isabstractmethod__",
> False))
> 84 for base in bases:
> ---> 85 for name in getattr(base, "__abstractmethods__",
> set()):
> 86 value = getattr(cls, name, None)
> 87 if getattr(value, "__isabstractmethod__",
> False):
>
> TypeError: Error when calling the metaclass bases
> 'getset_descriptor' object is not iterable
>
>
> Anybody knows why? Every type is just an object, isn't it?

This may be an oversight in ABCMeta implementation - please file a bug
report at http://bugs.python.org/

--
Gabriel Genellina

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