On Wed, Jun 10, 2009 at 12:08 PM, Dag Sverre Seljebotn<[email protected]> wrote: > Brent Pedersen wrote: >> On Thu, May 14, 2009 at 9:05 AM, Robert<[email protected]> wrote: >>> Dag Sverre Seljebotn wrote: >>>> Robert wrote: >>>>> How to deal with Python's array.array directly - as with numpy.pxd >>>>> is there a array.pxd ? >>>> Which Python version? >>> mainly 2.6; and 2.3 >>> >>>> Under Python 3 this should probably happen automatically, try: >>>> >>>> cdef object[int, ndim=1, mode="c"] arr = yourarray >>>> >>>> Not sure about Python 2.6+ >>> 2.6.2 didn't: >>> File "calc_c.pyx", line 32, in calc_c.test1 (calc_c.c:808) >>> cdef object[float, ndim=1, mode="c"] b = pyarray >>> TypeError: 'array.array' does not have the buffer interface >>> >>> in Python "buffer(myarray)" also behaves strange >>> >>>> For Python 2.5- an array.pxd must be written. It is not difficult, one >>>> simply follows the pattern in numpy.pxd (by implementing __getbuffer__ >>>> and filling in the Py_buffer struct). >>>> >>>> If somebody ends up doing this, please submit it for inclusion in >>>> Python. >>> I've put a array.pxd here: >>> http://trac.cython.org/cython_trac/ticket/314 >> >> hi, what's the status on this? it seemed very useful. >> if it needs tests, i could try to write some given some info on where >> to start, what to >> cover or maybe some cython-numpy tests to from which to crib? >> thanks, >> -brent > > Great! > > The main issue with the patch as I see it is that it tries to hack on > multi-dimensionality. That is very easily done simply by writing a > subclass of array instead, and so doesn't belong in the pxd like this. > > If you could just remove the multi-dimensional stuff from it I'd be > happy to accept it. Accompanying tests are strongly preferred though. > > There's a section on writing tests here: > http://wiki.cython.org/HackerGuide > > I don't expect the numpy tests to be too useful (though they are in > tests/run), just make sure the basics work with a couple of different > datatypes. I'll be happy to suggest improvements if you make a first > iteration anyway. >
thanks for the pointers, i have a start on this, but what should i do with the arrayarray.h? there doesnt seem to be any cases where a header is included with cython itself. -brent > -- > Dag Sverre > _______________________________________________ > Cython-dev mailing list > [email protected] > http://codespeak.net/mailman/listinfo/cython-dev > _______________________________________________ Cython-dev mailing list [email protected] http://codespeak.net/mailman/listinfo/cython-dev
