assigning a custom mapping type to __dict__

Nick Coghlan ncoghlan at iinet.net.au
Tue Mar 1 11:56:38 CET 2005


Daniel Cer wrote:
> Why not just inherit from dict? That seems to work.

Because that isn't the question - Steven knows how to make it work, what he's 
curious about is why things are the way they are :)

Anyway, a quick look suggests that it is due to typeobject.c using the concrete 
PyDict_* API calls [1] to manipulate tp_dict, rather than the abstract 
PyMapping_* calls [2]. The reason behind using the concrete API is, presumably, 
a question of speed :)

Cheers,
Nick.

[1] http://www.python.org/dev/doc/devel/api/dictObjects.html
[2] http://www.python.org/dev/doc/devel/api/mapping.html
-- 
Nick Coghlan   |   ncoghlan at email.com   |   Brisbane, Australia
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