[Python-3000] Using memoryviews

[Georg Brandl]

Josiah Carlson schrieb:
> On Sat, Nov 22, 2008 at 4:18 PM, Antoine Pitrou <solipsis at pitrou.net> wrote:
>> Josiah Carlson <josiah.carlson <at> gmail.com> writes:
>>>
>>> From what I understand of the memoryview when I tried to do the same
>>> thing a few months ago (use memoryview to replace buffer in
>>> asyncore/asynchat), memoryview is incomplete.  It didn't support
>>> character buffer slicing (you know, the 'offset' and 'size' arguments
>>> that were in buffer), and at least a handful of other things (that I
>>> can't remember at the moment).
>>
>> You should try again, memoryview now supports slicing (with the usual Python
>> syntax, e.g. m[2:5]) as well as slice assignment (with the fairly sensible
>> limitation that you can't resize the underlying buffer). There's no real doc for
>> it, but you can look at test_memoryview.py in the Lib/test directory to have a
>> fairly comprehensive list of the things currently supported.
> 
> I meant in the sense of X = memoryview(char_buffer, offset, length).
> Post-facto slicing is nice, but a little more wasteful than necessary.

Why? It's only a view, after all.

Georg

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