New submission from Sebastian Berg <sebast...@sipsolutions.net>:
This is mainly an information request, so sorry if its a bit besides the point (I do not mind if you just close it). But it seemed a bit too specific to get answers in most places... In Python you use argument clinic, which supports `METH_FASTCALL`, that seems pretty awesome. For extension modules, I am not sure that argument clinic is a straight forward choice, since it probably generates code specific to a single Python version and also using, while we need to support multiple versions (including versions that do not support `METH_FASTCALL`. So the question would be if there is some idea for providing such C-API, or for example exposing `_PyArg_UnpackKeywords` (which is at the heart of kwarg parsing). My use-case is that some NumPy functions do have a nice speedup when using `METH_FASTCALL` and better argument clinic style faster arg-parsing. Which is why, looking at these things, I practically reimplemented a slightly dumbed down version of `PyArg_ParseTupleAndKeywords` working much like argument clinic (except less smart and only using macros and no code generation). That seems viable, but also feels a bit wrong, so I am curious if there may be a better solution or whether it would be plausible to expose `_PyArg_UnpackKeywords` to reduce code duplication. (although I suppose due to old python version support that would effectively take years) For completeness, my code in question is here: https://github.com/numpy/numpy/pull/15269 with the actual usage pattern being: static PyObject *my_method(PyObject *self, NPY_ARGUMENTS_DEF) { NPY_PREPARE_ARGPARSER; PyObject *argument1; int argument2 = -1; if (!npy_parse_arguments("method", 1, -1, NPY_ARGUMENTS_PASS), "argument1", NULL, &argument1, "argument2", &PyArray_PythonPyIntFromInt, &argument2, NULL, NULL, NULL) { return NULL; } } ---------- components: Argument Clinic messages: 360073 nosy: larry, seberg priority: normal severity: normal status: open title: Use of argument clinic like parsing and `METH_FASTCALL` support in extension modules type: enhancement _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue39347> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
