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Thu Aug 18 18:57:00 CEST 2011 · https://mail.python.org/pipermail/python-dev/2011-August/112921.html

Antoine Pitrou <solipsis at pitrou.net> wrote:
> > I would like to fix this in the features/pep-3118 repository as follows:
> > 
> >   - memoryview should respect the format specifiers.
> > 
> >   - bytearray and friends should set the format specifier to "c"
> >     in their getbuffer() methods.
> > 
> >   - Introduce a new function PyMemoryView_FromBytes() that can be used
> >     instead of PyMemoryView_FromBuffer(). PyMemoryView_FromBuffer()
> >     is usually used in conjunction with PyBuffer_FillInfo(), which
> >     sets the format specifier to "B".
> 
> What would PyMemoryView_FromBytes() do? The name suggests it takes a
> bytes object, but you can already use PyMemoryView_FromObject() for
> that.

Oh no, the name isn't quite right then. It should be a replacement
for the combination PyBuffer_FillInfo()/PyMemoryView_FromBuffer()
and it should temporarily wrap a C-string. Also, unlike that combination,
it would set the format specifier to "c". Perhaps this name is better:

PyObject * PyMemoryView_FromCString(char *s, Py_ssize_t size, int flags);

'flags' is just PyBUF_READ or PyBUF_WRITE.

In the Python source tree, it could completely replace PyBuffer_FillInfo()
and PyMemoryView_FromBuffer().

Stefan Krah

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[Python-Dev] memoryview: "B", "c", "b" format specifiers