jython-2.7 - 使用 Jython 捕获输出 python 脚本

Question

当我输入 Python 脚本时，例如2 + 2，它返回4. 这就是我想要的。但是当我尝试输入时print 'hello world!'，出现异常！我只想从执行的 Python 脚本中获取解释器的输出。

private PythonInterpreter coder = new PythonInterpreter();
private String script;
private PyObject interp;

private void jButton1MouseClicked(java.awt.event.MouseEvent evt) {                                      

    try
    {
        coder.exec(script);             // this will execute the python script
        interp = coder.eval(script);    // this is what i use in trying to catch the interpreter's output
        System.out.println(interp);     // and trying to see what it returns
    }

    catch(Exception s)
    {
        JOptionPane.showMessageDialog(this, s, script, WIDTH, null);
    }
}