Re: [Py4j-users] Calling Python from Java side?

[Stephen B. <ja...@gm...>]

HI py4j is for going the other way: the Gateway serves java classes for use
by python.

2015-02-16 20:38 GMT-08:00 Frank J. Iannarilli, Jr. <fr...@ae...>:

> Hi,
>
>
> Barthelemy, thanks for contributing Py4J!
>
> Is Py4J suitable for enabling me to call Python methods (e.g. SciPy
> library) from my Java program?
>
> I've succeeded in exercising the Getting Started example:
> http://py4j.sourceforge.net/getting_started.html
>
> I am trying to grok your example:
> http://py4j.sourceforge.net/advanced_topics.html#
> implementing-java-interfaces-from-python-callback
> which was pointed to in response to a similar StackOverflow question:
> http://stackoverflow.com/questions/23157424/py4j-how-
> would-i-go-about-on-calling-a-python-method-in-java?rq=1
>
> Although I can see (from the OperatorExample.java file in the
> distribution) that Java File2 is not showing this method:
>    public static void main(String[] args) {
>         GatewayServer server = new GatewayServer(new OperatorExample());
>         server.start();
>     }
> ,
> I still can't see from this example how to call Python functions from my
> Java program.   Where this example (final lines in Python code) show:
>    # "Sends" python object to the Java side.
>     numbers = operator_example.randomBinaryOperator(operator)
> the meaning of "Sends" seems to imply a "non-stop round-trip" starting
> from and ending on the Python side.
>
> Is Py4J the wrong tool to be using for what I'm seeking?  Any advice
> appreciated!
> Thanks,
> Frank
>
>
>
> --
>
> Frank J. Iannarilli   fr...@ae...
> Aerodyne Research, Inc., 45 Manning Road, Billerica, MA 01821 USA
>
>
>
>
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