[Python-Dev] PEP: Adding data-type objects to Python
oliphant.travis at ieee.org
Tue Oct 31 21:56:30 CET 2006
Martin v. Löwis wrote:
> Stephan Tolksdorf schrieb:
>>While Travis' proposal encompasses the data format functionality within
>>the struct module and overlaps with what ctypes has to offer, it does
>>not aim to replace ctypes.
> This discussion could have been a lot shorter if he had said so.
> Unfortunately (?) he stated that it was *precisely* a motivation
> of the PEP to provide a standard data description machinery that
> can then be adopted by the struct, array, and ctypes modules.
Struct and array I was sure about. Ctypes less sure. I'm very sorry
for the distraction I caused by mis-stating my objective. My objective
is really the extended buffer protocol. The data-type object is a means
to that end.
I do think ctypes could make use of the data-type object and that there
is a real difference between using Python type objects as data-format
descriptions and using another Python type for those descriptions. I
thought to go the ctypes route (before I even knew what ctypes did) but
decided against it for a number of reasons.
But, nonetheless those are side issues. The purpose of the PEP is to
provide an object that the extended buffer protocol can use to share
data-format information. It should be considered primarily in that context.
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