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Tue Jun 26 15:43:59 EDT 2018 · https://mail.python.org/pipermail/python-dev/2018-June/154100.html

Hi all,

Just a reminder that PEP 576 still exists as a lightweight alternative 
to PEP 575/580. It achieves the same goals as PEP 580 but is much smaller.

https://github.com/markshannon/pep-576

Unless there is a big rush, I would like to do some experiments as to 
whether the new calling convention should be

typedef (*callptr)(PyObject *func, PyObject *const *stack,
                    Py_ssize_t nargs, PyObject *kwnames);

or whether the increased generality of:

typedef (*callptr)(PyObject *func, PyObject *const *stack,
                    Py_ssize_t nargs, PyObject *kwnames,
                    PyTupleObject *starargs, PyObject *kwdict);

is a worthwhile enhancement.

An implementation can be found here:
https://github.com/python/cpython/compare/master...markshannon:pep-576-minimal

Cheers,
Mark.

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[Python-Dev] PEP 576