How Can I Run Python Code Within a Java Application?

Can I Execute Python Code from Java?

Jython enables the seamless integration of Python and Java. While typically known for its support in calling Java code from Python, Jython offers reciprocal capabilities. You can indeed invoke Python functions directly from Java code.

To utilize this feature, simply follow these steps:

1. Import the Jython project: http://www.jython.org/index.html
2. Ensure your Python code is compatible with Jython. This means avoiding C-extensions not supported by the platform.
3. Use the org.python.util.PythonInterpreter class from Java 6's interpreter support to execute the Python functions.

Here's a concise example:

PythonInterpreter interpreter = new PythonInterpreter();
interpreter.exec("import sys\nsys.path.append('pathToModules if they are not there by default')\nimport yourModule");
// Execute a function that takes a string and returns a string
PyObject someFunc = interpreter.get("funcName");
PyObject result = someFunc.__call__(new PyString("Test!"));
String realResult = (String) result.__tojava__(String.class);

Please note that as of 2021, Jython does not fully support Python 3.x. Therefore, ensure your Python code adheres to Python 2.x syntax and libraries for compatibility.

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