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> Maybe a new C function can be designed to call a function: it would uses PyEval_EvalCodeEx() to call functions implemented in Python, or create the tuple for functions implemented in C.
I would expect C code to be more optimized that Python functions, but for the specific case of function calls: Python are more optimized with the fast-path fast_function()!
I recall vaguely that Larry Hasting shared me his idea of passing the Python stack to C functions to avoid the creation of a tuple.
Maybe we can add a new API for C functions accepted a C array of PyObject*, a number of positional arguments and a number of (key, value) pairs for keyword arguments. Something similar to PyEval_EvalCodeEx() but for C functions. It means that we should add a new flavor of PyArg_ParseTuple/PyArg_ParseTupleAndKeywords to accepts this format.
Larry's idea was to use the argument clinic to handle that for us.