`PySet` object recognized as `str` object

The following is my java code:

public void testPySet() {
    final PythonInterpreter interpreter = new PythonInterpreter();
    final String userCode = "def
test(x):\n\tprint(x)\n\tx.add(\"d\")\n\treturn x";
    interpreter.exec(userCode);
    final PyObject method = interpreter.get("test");
    final PySet set = new PySet(PyString.TYPE);
    set.add("a");
    set.add("b");
    set.add("c");
    final PyObject result = method.__call__(set);
    System.out.println(result);
}

When I run it, it will throw out an error message:

Traceback (most recent call last):
  File "<string>", line 3, in test
AttributeError: 'str' object has no attribute 'add'

If I remove the x.add(\"d\"), then it will run successfully.

It’s very weird that the PySet object is recognized as an str object.

Does anyone happen to know why?

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