Mailing List Archive: How do I throw an exception class from C?

Brad Clements <bkc@Murkworks.com> wrote:
: In my swig'd module I can easily throw an exception string or tuple, but
: how do I throw an exception class?

: I want to create a new exception type that is a class, create a class object
: with some init data, then set the exception for the current thread to that
: object.

: Easy in Python, hard in C. How do I do it?

: Thanks,

You've created your exception already which is good. Now you need to set
the exception and return NULL instead of a Python object.

PyObject *
MyFunction(PyObject *self, PyObject *args)
{
...
PyErr_SetString(MyException, "You can't do that");
return NULL;
...
}

Returning NULL signals that an exception has been raised, and setting
the exception as above will save the exception info (a la
sys.exc_info). You might want to read up on
http://www.python.org/doc/current/api/exceptionHandling.html

-Arcege