| Re: Any interest in an IDL to Python interface? [message #59060 is a reply to message #59008] |
Mon, 03 March 2008 06:12   |
m_schellens
Messages: 31
Registered: February 2005
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Member |
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GDL
http://sourceforge.net/projects/gnudatalanguage
has this functionality.
Actually both ways: One can call python from GDL similar as described
and GDL can be compiled as a python module.
The drawback is that GDL only supports python numarray yet.
Cheers,
Marc
On Feb 28, 5:00 pm, Jason Ferrara <jason.ferr...@jacquette.com> wrote:
> We're thinking of coming out with product that acts as a bridge
> between IDL and Python, and are trying to get an idea of how much of a
> demand there is for this sort of thing.
>
> It would make Python modules usable directly from IDL.
>
> Some simple usage examples, meant to show how the interface works,
> rather than why you might want to use Python from IDL.
>
> Using the Python Imaging Library to load an image, rotate it, and then
> place it in an IDL array.
> IDL> numpy=pyimport('numpy')
> Loaded DLM: PYTHONFROMIDL.
> IDL> pilimage=pyimport('PIL.Image')
> IDL> img=pilimage->open('scan.jpeg')
> IDL> img=img->rotate(30)
> IDL> imgarr=numpy->array(img)
> IDL> help, imgarr
> IMGARR BYTE = Array[3, 850, 864]
> IDL> tv, imgarr, /true, order=1
>
> Defining and calling an arbitrary python function.
> IDL> py=pyimport('__main__')
> IDL> py->exec, "def mulbytwo(a):"+string(10b)+" return [x*2 for x
> in a]"
> IDL> print, py->mulbytwo([1,2,3,4,5])
> 2 4 6 8 10
>
> Features of the interface:
>
> Python objects (including modules) appear in IDL as IDL objects.
>
> Automatic conversion of method parameters from IDL variables to the
> appropriate python type.
>
> Automatic conversion of return values to IDL types.
>
> The Python environment runs in the same process as IDL, so parameter
> passing is fast.
>
> Automatic garbage collection of IDL objects that represent Python
> objects, so calling OBJ_DESTROY is not required. This makes the
> objects behave more Python like, so that you can do things like
> "img=((pilimage->open('scan.jpeg'))->rotate(30))->convert('L') "
> without leaking objects or having to call HEAP_GC.
>
> Would anyone find this useful?
>
> Thanks
>
> Jason Ferrara
> Jacquette Consulting, Inc.
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