Returning a tuple of multipe objects in Python C API

Question

I am writing a native function that will return multiple Python objects

PyObject *V = PyList_New(0);
PyObject *E = PyList_New(0);
PyObject *F = PyList_New(0);

return Py_BuildValue("ooo", V, E, F);

This compiles fine, however, when I call it from a Python program, I get an error:

SystemError: bad format char passed to Py_BuildValue

How can this be done correctly?

EDIT: The following works

PyObject *rslt = PyTuple_New(3);
PyTuple_SetItem(rslt, 0, V);
PyTuple_SetItem(rslt, 1, E);
PyTuple_SetItem(rslt, 2, F);
return rslt;

However, isn't there a shorter way to do this?

Answer 1

I think it wants upper-case O? "OOO", not "ooo".

Answer 2

Use Cython.

return V, E, F