[Python-Dev] Adding types.build_class for 3.3

[Terry Reedy]

On 5/11/2012 2:21 AM, Mark Shannon wrote:
> Nick Coghlan wrote:

>> The question now moves to the implementation strategy - whether we
>> redirect to the C machinery as originally proposed (either via
>> __build_class__ or a new _types module) or just reimplement the
>> algorithm in pure Python. The latter is actually quite an appealing
>> concept, since it becomes a cross-check on the native C version.

I assume types.new_class would eventually call type(). This would make 
it available to any implementation with a conforming type().

> +1 to a pure Python version.

Since new_class would be used rarely and not in inner loops, and (if I 
understand) should mostly contain branching logic rather than looping, 
speed hardly seems an issue.

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Terry Jan Reedy