If I have the following function and the optional argument myobj is not passed, does myobj remain NULL or is it set to Py_None?
static PyObject * myfunc(PyObject * self, PyObject * args) {
PyObject * myobj = NULL;
if (!PyArg_ParseTuple(args, "|O", &myobj)) {
return NULL;
}
// ...
}
According Parsing arguments and building values,
|Indicates that the remaining arguments in the Python argument list are optional. The C variables corresponding to optional arguments should be initialized to their default value — when an optional argument is not specified, PyArg_ParseTuple() does not touch the contents of the corresponding C variable(s).
Does this apply to PyObject *s? It's obviously a pointer that exists in C so one could say it's a C variable, but it's a pointer to a python object so one could also say it does not count as a C variable.