How can I call Python functions from Java using Jython?

Invoking Python from Java: Jython's Role

While Jython bridges the Python-Java divide by facilitating the execution of Python code in Java environments, it is crucial to note its primary functionality: enabling the invocation of Java code from Python.

Calling Python Functions from Java with Jython

If your Python code is compatible with Jython (i.e., free from unsupported C extensions), you can seamlessly call Python functions from Java. This approach offers the most straightforward solution for this task.

An Illustrative Example

The following Java code snippet demonstrates how to invoke a Python function that operates on a string and returns a string:

<code class="java">PythonInterpreter interpreter = new PythonInterpreter();
interpreter.exec("import sys\nsys.path.append('pathToModules if they are not there by default')\nimport yourModule");
PyObject someFunc = interpreter.get("funcName");
PyObject result = someFunc.__call__(new PyString("Test!"));
String realResult = (String) result.__tojava__(String.class);</code>

Alternative Approach for More Complex Scenarios

In cases where Jython is not an appropriate solution, Java 6 introduces the org.python.util.PythonInterpreter. This API provides an alternative for executing Python code from Java.

Note: Jython currently does not support Python 3.x as of 2021.

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