[kepler-users] python in kepler

[kianwee chen]

Thanks! This clear up a few question I have in mind about python and kepler.


>>>One possibility would be to implement a similar interface to Python,
though this >>>would be a somewhat complex task.

>>>Another possibility is to use the bcvtb facility in Ptolemy II to
interface via a >>>socket to a Python process. This is also complex, but
probably easier that writing >>>your own interface.

Ya this task that you mention here seems really complex for me, as I might
not have the technical skills to implement all this.

Will check out  python and kepler website. Great Thanks for the help

regards
ckw
 On Oct 12, 2011 12:38 AM, "Christopher Brooks" <cxh at eecs.berkeley.edu>
wrote:

>  .Hi ckw,
> Yes, this is a good place for questions about using Kepler.
>
> Yes, Kepler has an actor named "Python Script".  The actor uses Jython,
> which is a Java implementation of Python.  Kepler is using Jython 2.2 or
> 2.2.1.
> I tried upgrading, but jython2.5.8 does not have
> org.python.core.PyJavaInstance.
> Jython is present as a jar file in Kepler.  So, Kepler is not using an
> external
> version of Python, it is using the Jython jar file at
> ./ptolemy/src/lib/jython.jar.
>
> To execute an external program, you could use the Kepler "External
> Execution" actor.
> This merely invokes the program as a separate process.  This would not make
> the Python in the external program visible to the Kepler process.
>
> I'm not sure how you would interface to a Python interpreter outside of
> Kepler.
> The non-Jython, outside Python interpreter is presumably written in C or
> C++.
> You could use the Java Native Interface (JNI) to interface to outside
> Python shared libraries.
> JNI is rather difficult to use.  Kepler uses Ptolemy II as its engine.
> Ptolemy II has
> a Matlab interface that is found in the Kepler sources as
> kepler/ptolemy/src/ptolemy/matlab/
> One possibility would be to implement a similar interface to Python, though
> this would be a somewhat complex task.
>
> Another possibility is to use the bcvtb facility in Ptolemy II to interface
> via a socket
> to a Python process.  This is also complex, but probably easier that
> writing your
> own interface.  In Ptolemy II, see $PTII/lbnl for the bcvtb interface.
>
> I just started a page about Kepler and Python, see
> https://kepler-project.org/developers/reference/python-and-kepler
>
> _Christopher
>
>
> On 10/11/11 4:49 AM, kianwee chen wrote:
>
> Hi! I am a newbie in using kepler and every now and then I will run into
> obstacles concerning the usage of kepler, so I am wondering if this forum is
> a good place post my questions ?
>
> I am currently trying to use the pythonscript actor in kepler to execute an
> external programme ( the external programme has a python api which I can
> make use of ) thus I would like to know, does kepler has its own python
> interpreter ? or does it use the python that is in the environment PATH of
> my OS ? Is it possible to change the python intepreter to python that the
> external programme is using to ensure that the version of python use is the
> same between kepler and the external programme ?
>
> ckw
>
>  --
> Christopher Brooks, PMP                       University of California
> CHESS Executive Director                      US Mail: 337 Cory Hall
> Programmer/Analyst CHESS/Ptolemy/Trust        Berkeley, CA 94720-1774
> ph: 510.643.9841                                (Office: 545Q Cory)
> home: (F-Tu) 707.665.0131 cell: 707.332.0670
>
>
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