New submission from Max Bachmann <kont...@maxbachmann.de>:
The documentation of PyObject_Call here: https://docs.python.org/3/c-api/call.html#c.PyObject_Call states, that it is the equivalent of the Python expression: callable(*args, **kwargs). so I would expect: PyObject* args = PyTuple_New(0); PyObject* kwargs = PyDict_New(); PyObject_Call(funcObj, args, kwargs) to behave similar to args = [] kwargs = {} func(*args, **kwargs) however this is not the case since in this case when I edit kwargs inside PyObject* func(PyObject* /*self*/, PyObject* /*args*/, PyObject* keywds) { PyObject* str = PyUnicode_FromString("test_str"); PyDict_SetItemString(keywds, "test", str); } it changes the original dictionary passed into PyObject_Call. I was wondering, whether this means, that: a) it is not allowed to modify the keywds argument passed to a PyCFunctionWithKeywords b) when calling PyObject_Call it is required to copy the kwargs for the call using PyDict_Copy Neither the documentation of PyObject_Call nor the documentation of PyCFunctionWithKeywords (https://docs.python.org/3/c-api/structures.html#c.PyCFunctionWithKeywords) made this clear to me. ---------- components: C API messages: 382927 nosy: maxbachmann priority: normal severity: normal status: open title: PyObject_Call not behaving as documented type: behavior versions: Python 3.9 _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue42629> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
