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Passing array from java to python

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  Passing array from java to python loial <jldunn2000@gmail.com> - 2011-06-02 02:54 -0700
    Re: Passing array from java to python Chris Rebert <clp2@rebertia.com> - 2011-06-02 03:16 -0700
      Re: Passing array from java to python loial <jldunn2000@gmail.com> - 2011-06-02 03:47 -0700
        Re: Passing array from java to python Chris Rebert <clp2@rebertia.com> - 2011-06-02 04:07 -0700
        Re: Passing array from java to python Ian Kelly <ian.g.kelly@gmail.com> - 2011-06-02 11:06 -0600
    Re: Passing array from java to python Marco Nawijn <nawijn@gmail.com> - 2011-06-03 11:54 -0700

#6849 — Passing array from java to python

I need to pass some sort of array or hashmap from Java and read the
data in a python script (which will be called by the java class). Is
there any neater way  to do this other than just passing strings?

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#6851

On Thu, Jun 2, 2011 at 2:54 AM, loial <jldunn2000@gmail.com> wrote:
> I need to pass some sort of array or hashmap from Java and read the
> data in a python script (which will be called by the java class). Is
> there any neater way  to do this other than just passing strings?

Jython?: http://www.jython.org/

Or depending on how you define "just passing strings", JSON:
http://json.org/
http://docs.python.org/library/json.html

Cheers,
Chris

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#6853

Unfortunately using jpython or json are not options at the moment

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#6855

On Thu, Jun 2, 2011 at 3:47 AM, loial <jldunn2000@gmail.com> wrote:
> Unfortunately using jpython or json are not options at the moment

What rules out JSON that does not also rule out the "just passing
strings" approach?

What about (*shudder*) XML? (Can't believe I just said that...)

Cheers,
Chris

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#6873

On Thu, Jun 2, 2011 at 4:47 AM, loial <jldunn2000@gmail.com> wrote:
> Unfortunately using jpython or json are not options at the moment

How about JPype?  Or do the Java and Python need to be in separate processes?

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#6961

On Jun 2, 11:54 am, loial <jldunn2...@gmail.com> wrote:
> I need to pass some sort of array or hashmap from Java and read the
> data in a python script (which will be called by the java class). Is
> there any neater way  to do this other than just passing strings?

I recently had to deal with the same problem, some bi-directional
communication between Java and Python. Several options were discussed
between me and my fellow programmer. In the end we settled for XML-
rpc. It works remarkably well in our case. We use it to pass test and
simulation data to GUI code. XML-rpc is very well supported in python.
Basic types (lists, dicts etc.) are encoded automatically. If the
arrays are very large, I would probably use an intermediate database
(e.g. Hdf5) for storage and then use some sort of messaging to inform
the Java code of any changes.

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