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From: Robert Bradshaw <rober...@gmail.com>
Date: Wed, 3 Oct 2012 17:35:21 -0700
Message-ID: <CADiQ+QDxmKuCw7exOcnVvjfX6ipXXBob_obu3jiw5R+Goay...@mail.gmail.com>
Subject: Re: [cython-users] run-time vs. compile time import paths.
To: cython-users@googlegroups.com
Content-Type: text/plain; charset=UTF-8

On Wed, Oct 3, 2012 at 5:27 PM, Chris Barker <chris.bar...@noaa.gov> wrote:
> On Wed, Oct 3, 2012 at 2:14 PM, Robert Bradshaw <rober...@gmail.com> wrote:
>
>>>> (https://github.com/cython/cython/blob/master/Cython/Compiler/Options.py#L66
>>>> might be of interest as well.)
>
> OK -- that shows the option:
>
> # Allows cimporting from a pyx file without a pxd file.
> cimport_from_pyx = False
>
> Which looks like a great idea. However:
>
> 1) how do you change that option -- treating it like compiler
> directive, either with:
>
> #cython: cimport_from_pyx=False
>
> or passing it in on the comamnd line:
>
> cython --cplus  -X cimport_from_pyx=True  multi_rectangle.pyx
>
>
> did not work.
>
> So I changed it in the Options.py file directly. But I'd rather not
> make that a global change!
>
> After that, Cython now gets psat the cipmport statement, no longer
> with the error tha the *.pxd can not be found. But it doesn't seem to
> work either.

That's why it's not easy to turn on yet :-P. You can set it manually
in a setup.py by importing Cython.Compiler.Options, but it's not
something I'd worry about at this point. Thanks for the example, I'll
take a look.

> I borrowed an example from the Wiki, and am adding to it, so in
> rectangle.pyx, I have:
>
> cdef class Rectangle:
>     cdef c_Rectangle *thisptr      # hold a C++ instance which we're wrapping
>     def __cinit__(self, int x0, int y0, int x1, int y1):
>         self.thisptr = new_Rectangle(x0, y0, x1, y1)
> ....
> (and so on)
>
>
> Then in multi_rectangle.pyx, I put:
>
>
> from rectangle cimport Rectangle
> ...
>     def addRect(self, Rectangle rect):
>         """
>         add a rectangle object -- this will only take a rectangle object
>         """
>
>         self.rectangles.append(rect)
> ...
>
> But I get:
>
>
>     def addRect(self, Rectangle rect):
>                      ^
> ------------------------------------------------------------
>
> multi_rectangle.pyx:24:22: 'Rectangle' is not a type identifier
>
>
> so something isn't working.
>
> I've enclosed the whole package if anyone wants to take a look.
>
> Thanks,
>   -Chris
>
>
> --
>
> Christopher Barker, Ph.D.
> Oceanographer
>
> Emergency Response Division
> NOAA/NOS/OR&R            (206) 526-6959   voice
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>
> Chris.Bar...@noaa.gov