Re: `PySet` object recognized as `str` object

Frank,

The problem is in the line

final PySet set = new PySet(PyString.TYPE);

I think you are trying to use this as if it were PySet<PyString> set = new
PySet<PyString>(), but actually it means that the type of the resulting
object in Python code should be PyString. Which is exactly what you observe!

(Why is the case? We have two object models in Jython: Python and Java, and
we have to combine support in the runtime. It can be a bit tricky to do so!)

The solution is very simple: change the initialization to

final PySet set = new PySet()

- Jim

On Sat, May 9, 2015 at 8:22 AM, Frank Dai <[email protected]> wrote:

> 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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-- 
- Jim

jim.baker@{colorado.edu|python.org|rackspace.com|zyasoft.com}
twitter.com/jimbaker
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