abstract metaclass

Gabriel Genellina gagsl-py2 at yahoo.com.ar
Fri Aug 6 12:13:17 CEST 2010


En Thu, 05 Aug 2010 10:46:29 -0300, Roald de Vries <downaold at gmail.com>  
escribió:

> 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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