[Cython] 0.9.8.1.1 and .pxd files

[Stefan Behnel]

Hi,

Lisandro Dalcin wrote:
> On Thu, Aug 28, 2008 at 7:05 PM, Jay Parlar <parlar at gmail.com> wrote:
>> This seems to have worked. Is there a difference between having a
>> __init__.pyx and just a regular __init__.py? I've got .py now, and it
>> seems to be working.
> 
> AFAIK, there is no difference. However, if you 'install' your pxd's as
> package data, perhaps you will need to also install a __init__.pyx
> alongside the pxd's. For example, from one of my projects, pxd and C
> API (plus SWIG typemaps for my objects) are installed inside a
> 'include' dir (more or less as numpy does):
> 
> $ tree ~/lib/python/mpi4py
> /u/dalcinl/lib/python/mpi4py
> |-- MPI.so
> |-- __init__.py
> |-- __init__.pyc
> |-- __init__.pyo
> |-- include
> |   `-- mpi4py
> |       |-- MPI.pxd
> |       |-- __init__.pyx
> |       |-- mpi.pxi
> |       |-- mpi4py.h
> |       |-- mpi4py.i
> |       |-- mpi4py_MPI.h
> |       |-- mpi4py_MPI_api.h
> |       |-- mpi4py_MPI_api_fix.h
> |       `-- mpi_c.pxd
> |-- rc.py
> |-- rc.pyc
> `-- rc.pyo

To clarify a bit, the only difference is that Cython knows both, but Python
only recognises __init__.py. So if you want to install a Cython package in a
place that Python does not recognise as package, __init__.pyx is a good way to
do so.

Stefan