javapythonspring-bootpythoninterpreter

Is there a way to return the value of the output of python code like "print('python code')" into a String or other object using PythonInterpreter

I am trying to make a simple python interpreter using java. basically, you write some python code like print('hello world') and the request is sent to a spring boot back end app that interprets the code using PythonInterpreter library and returns the result in a JSON object form like :

{
  "result": "hello world"
}

I tried the following code that displays the result of print on the console but I wasn't able yet to assign the return into a variable that I need to construct the JSON response.

PythonInterpreter interp = new PythonInterpreter();
interp.exec("print('hello world')");

prints hello world on the console.

I want something like this :

PythonInterpreter interp = new PythonInterpreter();
interp.exec("x = 2+2");
PyObject x = interp.get("x");
System.out.println("x: "+x);

this prints x: 4 i want to do the same with print but I still haven't found a solution.

anyone has an idea on how to do this would really appreciate your help.

Solution

  • If you read the documentation, i.e. the javadoc of PythonInterpreter, you will find the following methods:

    So you would do it like this:

    StringWriter out = new StringWriter();
PythonInterpreter interp = new PythonInterpreter();
interp.setOut(out);
interp.setErr(out);
interp.exec("print('hello world')");
String result = out.toString();
System.out.println("result: " + result);