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chojrak11@gmail.com wrote:

Ok so I did the following. In init function (forget refcounting and error checking for a moment ;-)

PyObject *dict = PyDict_New(); PyDict_SetItemString(dict, "errorcode", PyInt_FromLong(0)); static PyObject *myexception = PyErr_NewException("module.MyException", NULL, dict); PyModule_AddObject(module, "MyException", myexception);

It worked more or less as expected, the help shown:

| ---------------------------------------------------------------------- | Data and other attributes defined here: | | errorcode = 0 | | ----------------------------------------------------------------------

Then I did the following when raising the exception:

PyObject_SetAttrString(myexception, "errorcode", PyInt_FromLong(111)); PyErr_SetString(myexception, "Bad thing happened"); return NULL;

and the test code was: try: do_bad_thing(); except MyException, data:

and you surely already guessed it -- data.errorcode was 0.... Not only that, module.MyException.errorcode was also 0...

What I'm doing wrong? I certainly don't get the idea of exceptions in Python, especially what is being raised - a class or an instance? If the latter - how's the class instantiated? If not - what about values in different threads? The docs are so vague about that...

The quick way to fix your problem might be to write the exception code in Cython like thís:

class MyException(Exception):
    def __init__(self, errorcode, message):
        super(MyException, self).__init__(self, message)
        self.errorcode = errorcode

and use that instead. You can also make it an exception class if you like, by declaring the Exception class as an external type (requires Py2.5+). In this case, Cython can generate a header file for you that declares your new extension type.

http://cython.org/

Stefan