How to call a python method from a java class?

Question

I am using Jython within a Java project.

I have one Java class: myJavaClass.java and one Python class: myPythonClass.py

public class myJavaClass{
    public String myMethod() {
        PythonInterpreter interpreter = new PythonInterpreter();
        //Code to write
    }
 }

The Python file is as follows:

class myPythonClass:
    def abc(self):
        print "calling abc"
        tmpb = {}
        tmpb = {'status' : 'SUCCESS'}
        return tmpb

Now the problem is I want to call the abc() method of my Python file from the myMethod method of my Java file and print the result.

Answer 1

If I read the docs right, you can just use the eval function:

interpreter.execfile("/path/to/python_file.py");
PyDictionary result = interpreter.eval("myPythonClass().abc()");

Or if you want to get a string:

PyObject str = interpreter.eval("repr(myPythonClass().abc())");
System.out.println(str.toString());

If you want to supply it with some input from Java variables, you can use set beforehand and than use that variable name within your Python code:

interpreter.set("myvariable", Integer(21));
PyObject answer = interpreter.eval("'the answer is: %s' % (2*myvariable)");
System.out.println(answer.toString());