[Python-Dev] Extended buffer PEP

[Travis Oliphant]

Here is my "final" draft of the extended buffer interface PEP. 

For those who have been following the discussion, I eliminated the 
releaser object and the lock-buffer function.   I decided that there is 
enough to explain with the new striding and sub-offsets without the 
added confusion of releasing buffers, especially when it is not clear 
what is to be gained by such complexity except a few saved lines of code.

The striding and sub-offsets, however, allow extension module writers to 
write code (say video and image processing code or scientific computing 
code or data-base processing code) that works on any object exposing the 
buffer interface.  I think this will be of great benefit and so is worth 
the complexity.

This will take some work to get implemented for Python 3k.  I could use 
some help with this in order to speed up the process.  I'm working right 
now on the extensions to the struct module until the rest is approved.

Thank you for any and all comments:

-Travis


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