[Cython] planning for 0.17

[mark florisson]

On 27 June 2012 12:59, Stefan Behnel <stefan_ml at behnel.de> wrote:
> mark florisson, 27.06.2012 11:54:
>> if anyone would like to pick up the  release for 0.17, I'd be much
>> obliged.
>
> I think I can handle it. :)
>

Great, thanks!

>> I can't test it right now, but I don't understand the following in the
>> release notes (regarding array.array): "Note that only the buffer
>> syntax is supported for these arrays. To use memoryviews with them,
>> use the buffer syntax to unpack the buffer first.". Why is that, it
>> implements __getbuffer__ right? So it shouldn't matter whether you use
>> memoryviews or buffer syntax, both use __Pyx_GetBuffer().
>
> The problem is that arrayarray.pxd is only used when the exporter is typed.
> This means that you can't do this:
>
>    def func(int[:] arr): pass
>
>    func(array.array('i', [1,2,3]))

That works for me, as long and array is cimported from cpython (as
'array' or some other name). It will patch __Pyx_GetBuffer with a
typecheck and a call to its __getbuffer__ method.

> but it will work if func() is defined like this:
>
>    def func(array.array arr):
>        cdef int[:] view = arr
>
> I admit that the wording in the release notes is wrong, I wrote it because
> I initially thought that you had to do this:
>
>    def func(array.array[int] arr):
>        cdef int[:] view = arr
>
> But no, you don't have to use the buffer interface, you just have to type
> the variable. I'll update the release notes.
>
> Works better in Py3, obviously.
>
> Stefan
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