[SciPy-dev] Using memoryviews

Charles R Harris charlesr.harris@gmail....
Tue Nov 25 20:19:03 CST 2008


On Tue, Nov 25, 2008 at 11:45 AM, Neal Becker <ndbecker2@gmail.com> wrote:

> This discussion might be of interest (from python-3000.devel):
>
> Antoine Pitrou 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 also support the addition of official functions or macros to access the
> > underlying fields of the Py_buffer struct, rather than access them
> > directly from 3rd party code. Someone please open an issue for that in
> the
> > tracker.
> >
> > The big, big limitation of memoryviews right now is that they only
> support
> > one-dimensional byte buffers. The people interested in more complex
> > arrangements (that is, Scipy/Numpy people) have been completely absent
> > from the python-dev community for many months now, and I don't think
> > anyone else cares enough to do the job instead of them.
> >


What is memoryview?

Chuck
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