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

Hi Jim,

You're correct, thank you very much! You're awesome!

On Sat, May 9, 2015 at 7:33 AM, Jim Baker <[email protected]> wrote:

> 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
> github.com/jimbaker
> bitbucket.com/jimbaker
>



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