Sequence Protocol, assign item

[greg]

Torsten Mohr wrote:
> static int pytypeseq_ass_item(PyObject* s, int nr, PyObject* val) {
>         int v;
>         pytype_obj* self = (pytype_obj*)s;
> 
>         if(!PyArg_ParseTuple(val, "i", &v)) {

You don't want to use PyArg_ParseTuple here, because 'val'
isn't wrapped in a tuple, it's the bare value of the RHS.
Instead you want

    v = PyInt_AsLong(val);
    if (PyErr_Occurred())
       return -1;

Also note the -1 return value (not 0) to signal an error.

> In part A some INCREF/DECREF stuff is done, but i think i don't need
> this as the PyObjects are only temporarily.

That's correct in this case.

> Exception exceptions.SystemError: 'new style getargs format but argument \
> is not a tuple' in 'garbage collection' ignored

That's because you were passing PyArg_ParseTuple something
that wasn't a tuple. (The error message talks about argument
formats because PyArg_ParseTuple is intended for processing
argument lists, and in normal use it can't ever get passed
anything other than a tuple.)

Greg