[Python-3000] Metaclasses in Py3K

Talin talin at acm.org
Sat Dec 16 21:38:09 CET 2006

Phillip J. Eby wrote:
> At 11:30 AM 12/16/2006 -0800, Talin wrote:
>> The general idea is to have the metaclass create a mapping object which
>> is used as the 'locals' dictionary for the suite following the class
>> statement. There would be some special-named function of the metaclass,
>> such as '__metadict__', which would construct a new mapping object. I
>> haven't seen many alternative proposals to this.
> There's mine, where you simply create mcls(name, bases, {}) and then map 
> locals operations to get/set/delattr operations on the class.  This 
> would presumably be done using a simple mapping proxy, but it would be a 
> built-in type rather than the user having to implement their own mapping 
> type.

I'm not sure I entirely understand this. I did think about the idea of 
defining special get/set methods on the class, but everything I came up 
with was more complicated than just creating a special locals dict. The 
main issue for me is that I think that its important to distinguish 
between get/set operations that are done at class definition time, and 
get/set operations that are done later, after the class is created.

-- Talin

More information about the Python-3000 mailing list