[Py4j-users] Calling Python from Java side?

[Frank J. I. 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