[Python-3000] Metaclasses in Py3K (original) (raw)

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

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