Re: [Jython-users] [Q] newbie's question on Jython

[Robert W. B. <rb...@di...>]

On Tue, 21 Aug 2001, Young-Jin Lee wrote:
> Hi, all.
> I have a question on the imbedded Jython. It seems like that a Java
> application can use a Jython as an interpreter module, but I'm not sure
> what kind of things can be done with the imbedded Jython.

Anything you can do in Jython can be done with the embedded interpreter.

> For example,
> can a Java application call a user-defined Python method through a
> Jython interpreter?

Yes, with ease.

> If it cannot be done, is there any other way to do
> this?

Using the embedded interpreter is best.

> I need a Java interpreter module....

Here's an example...

import java.util.Properties;
import org.python.util.PythonInterpreter;

public class embeddingExample {

    protected PythonInterpreter interp;

    public static void main(String[] args) {
        embeddingExample embed = new Embedding();
        embed.startInterp();
        embed.test();
    }

    protected void startInterp() {
        Properties props = new Properties();

        if (System.getProperty("python.home") == null)
            props.put("python.home", "/usr/local/jython");

        PythonInterpreter.initialize(preProps, postProps, argv);
        interp = new PythonInterpreter();
    }

    public void useInterp() {
        // define and call a Jython function
        interp.exec("def test(message):\n" +
                    "    print message");
        interp.exec("test('Hello world')");

        // you can import Python modules as use them just as easily
        interp.exec("import glob\n" +
                    "print glob.glob('*')");

    }
}



Enjoy,
Robert