[Python-Dev] PEP: Adding data-type objects to Python
"Martin v. Löwis"
martin at v.loewis.de
Sun Oct 29 11:10:22 CET 2006
Travis E. Oliphant schrieb:
>> As I unification mechanism, I think it is insufficient. I doubt it
>> can express all the concepts that ctypes supports.
> Please clarify what you mean.
> Are you saying that a single object can't carry all the information
> about binary data that ctypes allows with it's multi-object approach?
I'm not sure what you mean by "single object". If I use the tuple
There are also multiple objects (the float, the 3, and the 2). You
get a single "root" object back, but so do you in ctypes.
But this isn't really what I meant. Instead, I think the PEP lacks
various concepts from C data types, such as pointers, unions,
function pointers, alignment/packing.
> In the mean-time, how are other packages supposed to communicate binary
> information about data with each other?
This is my other question. Why should they?
> Remember the context that the data-format object is presented in. Two
> packages need to share a chunk of memory (the package authors do not
> know each other and only have and Python as a common reference). They
> both want to describe that the memory they are sharing has some
> underlying binary structure.
Can you please give an example of such two packages, and an application
that needs them share data?
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