[Numpy-discussion] Recommended way to add Cython extension using numpy.distutils?

[Kevin Jacobs <jacobs@bioinformed.com>]

On Tue, Apr 27, 2010 at 8:09 PM, Matthew Brett <matthew.brett at gmail.com>wrote:

> Hi,
>
> We (neuroimaging.scipy.org) are using numpy.distutils, and we have
> .pyx files that we build with Cython.
>
> I wanted to add these in our current setup.py scripts, with something like:
>
> def configuration(parent_package='',top_path=None):
>    from numpy.distutils.misc_util import Configuration
>    config = Configuration('statistics', parent_package, top_path)
>    config.add_extension('intvol',
>                         ['intvol.pyx'], include_dirs = [np.get_include()])
>    return config
>
> but of course numpy only knows about Pyrex, and returns:
>
> error: Pyrex required for compiling
> 'nipy/algorithms/statistics/intvol.pyx' but notavailable
>
> Is there a recommended way to plumb Cython into the numpy build
> machinery?  Should I try and patch numpy distutils to use Cython if
> present?
>
>
Here is the monkey-patch I'm using in my project:

def evil_numpy_monkey_patch():
  from   numpy.distutils.command import build_src
  import Cython
  import Cython.Compiler.Main
  build_src.Pyrex = Cython
  build_src.have_pyrex = True
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