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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"C-API tracking: missing Stable ABI functions in crates/capi","articleBody":"Latest update: **2026-07-13**\n\n## Goal\nTrack CPython Stable ABI C-API functions that are still missing from RustPython `crates/capi`, organized by CPython `Include/` header layout (mirroring RustPython’s capi split, including `abstract_/*`).\n\n# Missing Stable ABI Functions by Header\n\nDerived from CPython `Misc/stable_abi.toml` and compared against exported C-API functions in RustPython `crates/capi/src`.\n\nThis list includes only functions that are still candidates for implementation in RustPython C-API:\n\n- starts from all `[function.*]` entries in `Misc/stable_abi.toml`\n- removes private functions (names starting with `_`)\n- removes functions already implemented in RustPython `crates/capi/src`\n- removes functions marked removed in CPython \"What's New\" C-API notes across Python 3.0 through 3.15\n- marks remaining deprecated or soft-deprecated functions as `(deprecated)`\n- groups remaining functions by CPython `Include/*.h` header, using RustPython's existing `crates/capi/src` file split (including `abstract_/*`)\n\nTotal missing: **334**\n\n## `Include/abstract.h -\u003e crates/capi/src/abstract_.rs` (4)\n\n- `PyObject_CallFunction`\n- `PyObject_CallFunctionObjArgs`\n- `PyObject_CallMethod`\n- `PyVectorcall_NARGS`\n\n## `Include/abstract.h -\u003e crates/capi/src/abstract_/iter.rs` (2)\n\n- `PyAIter_Check`\n- `PyObject_GetAIter`\n\n## `Include/abstract.h -\u003e crates/capi/src/abstract_/number.rs` (2)\n\n- `PyNumber_AsSsize_t`\n- `PyNumber_ToBase`\n\n## `Include/abstract.h -\u003e crates/capi/src/abstract_/sequence.rs` (1)\n\n- `PySequence_Fast`\n\n## `Include/audit.h` (2)\n\n- `PySys_Audit`\n- `PySys_AuditTuple`\n\n## `Include/bytearrayobject.h` (1)\n\n- `PyByteArray_Concat`\n\n## `Include/bytesobject.h` (9)\n\n- `PyBytes_AsStringAndSize`\n- `PyBytes_Concat`\n- `PyBytes_ConcatAndDel`\n- `PyBytes_DecodeEscape`\n- `PyBytes_FromFormat`\n- `PyBytes_FromFormatV`\n- `PyBytes_FromObject`\n- `PyBytes_FromString`\n- `PyBytes_Repr`\n\n## `Include/ceval.h` (8)\n\n- `PyEval_EvalCodeEx`\n- `PyEval_GetFuncName`\n- `PyEval_ReleaseThread`\n- `Py_AddPendingCall`\n- `Py_GetRecursionLimit`\n- `Py_LeaveRecursiveCall`\n- `Py_MakePendingCalls`\n- `Py_SetRecursionLimit`\n\n## `Include/descrobject.h` (7)\n\n- `PyDescr_NewClassMethod`\n- `PyDescr_NewGetSet`\n- `PyDescr_NewMember`\n- `PyDescr_NewMethod`\n- `PyMember_GetOne` (deprecated)\n- `PyMember_SetOne` (deprecated)\n- `PyWrapper_New`\n\n## `Include/dictobject.h` (7)\n\n- `PyDict_Clear`\n- `PyDict_DelItemString`\n- `PyDict_GetItem`\n- `PyDict_GetItemString`\n- `PyDict_GetItemStringRef`\n- `PyDict_GetItemWithError`\n- `PyDict_SetItemString`\n\n## `Include/fileobject.h` (5)\n\n- `PyFile_FromFd`\n- `PyFile_GetLine`\n- `PyFile_WriteObject`\n- `PyFile_WriteString`\n- `PyObject_AsFileDescriptor`\n\n## `Include/fileutils.h` (2)\n\n- `Py_DecodeLocale` (deprecated)\n- `Py_EncodeLocale` (deprecated)\n\n## `Include/import.h` (17)\n\n- `PyImport_AddModule`\n- `PyImport_AddModuleObject`\n- `PyImport_AppendInittab`\n- `PyImport_ExecCodeModule`\n- `PyImport_ExecCodeModuleObject`\n- `PyImport_ExecCodeModuleWithPathnames`\n- `PyImport_GetImporter`\n- `PyImport_GetMagicNumber`\n- `PyImport_GetMagicTag`\n- `PyImport_GetModule` (deprecated)\n- `PyImport_GetModuleDict`\n- `PyImport_ImportFrozenModule`\n- `PyImport_ImportFrozenModuleObject`\n- `PyImport_ImportModule` (deprecated)\n- `PyImport_ImportModuleLevel`\n- `PyImport_ImportModuleLevelObject`\n- `PyImport_ReloadModule`\n\n## `Include/intrcheck.h` (5)\n\n- `PyOS_AfterFork` (deprecated)\n- `PyOS_AfterFork_Child` (deprecated)\n- `PyOS_AfterFork_Parent` (deprecated)\n- `PyOS_BeforeFork` (deprecated)\n- `PyOS_InterruptOccurred`\n\n## `Include/iterobject.h` (2)\n\n- `PyCallIter_New`\n- `PySeqIter_New`\n\n## `Include/listobject.h` (1)\n\n- `PyList_GetItem`\n\n## `Include/longobject.h` (12)\n\n- `PyLongWriter_Create`\n- `PyLongWriter_Discard`\n- `PyLongWriter_Finish`\n- `PyLong_AsLongAndOverflow`\n- `PyLong_AsLongLongAndOverflow`\n- `PyLong_AsNativeBytes`\n- `PyLong_Export`\n- `PyLong_FreeExport`\n- `PyLong_GetInfo`\n- `PyLong_GetNativeLayout`\n- `PyOS_strtol`\n- `PyOS_strtoul`\n\n## `Include/memoryobject.h` (3)\n\n- `PyMemoryView_FromBuffer`\n- `PyMemoryView_FromMemory`\n- `PyMemoryView_GetContiguous`\n\n## `Include/methodobject.h` (3)\n\n- `PyCFunction_GetFlags`\n- `PyCFunction_GetFunction`\n- `PyCFunction_GetSelf`\n\n## `Include/modsupport.h` (21)\n\n- `PyABIInfo_Check`\n- `PyArg_Parse`\n- `PyArg_ParseTuple` (deprecated)\n- `PyArg_ParseTupleAndKeywords`\n- `PyArg_UnpackTuple`\n- `PyArg_VaParse`\n- `PyArg_VaParseTupleAndKeywords`\n- `PyArg_ValidateKeywordArguments`\n- `PyModule_Add` (deprecated)\n- `PyModule_AddFunctions`\n- `PyModule_AddIntConstant`\n- `PyModule_AddObject` (deprecated)\n- `PyModule_AddObjectRef` (deprecated)\n- `PyModule_AddStringConstant`\n- `PyModule_AddType`\n- `PyModule_Create2`\n- `PyModule_ExecDef` (deprecated)\n- `PyModule_FromDefAndSpec2` (deprecated)\n- `PyModule_SetDocString`\n- `Py_BuildValue`\n- `Py_VaBuildValue`\n\n## `Include/moduleobject.h` (11)\n\n- `PyModuleDef_Init`\n- `PyModule_GetDef`\n- `PyModule_GetDict`\n- `PyModule_GetFilename`\n- `PyModule_GetName`\n- `PyModule_GetState`\n- `PyModule_GetStateSize`\n- `PyModule_GetState_DuringGC`\n- `PyModule_GetToken`\n- `PyModule_GetToken_DuringGC`\n- `PyModule_New`\n\n## `Include/object.h` (22)\n\n- `PyType_ClearCache`\n- `PyType_FromMetaclass` (deprecated)\n- `PyType_FromModuleAndSpec` (deprecated)\n- `PyType_FromSlots`\n- `PyType_FromSpec` (deprecated)\n- `PyType_FromSpecWithBases` (deprecated)\n- `PyType_GenericAlloc`\n- `PyType_GenericNew`\n- `PyType_GetBaseByToken`\n- `PyType_GetBaseByToken_DuringGC`\n- `PyType_GetModule`\n- `PyType_GetModuleByDef`\n- `PyType_GetModuleByToken`\n- `PyType_GetModuleByToken_DuringGC`\n- `PyType_GetModuleState`\n- `PyType_GetModuleState_DuringGC`\n- `PyType_GetModule_DuringGC`\n- `PyType_GetTypeDataSize`\n- `PyType_Modified`\n- `PyType_Ready`\n- `Py_SET_SIZE`\n- `Py_SIZE`\n\n## `Include/objimpl.h` (3)\n\n- `PyObject_GC_Del`\n- `PyObject_Init`\n- `PyObject_InitVar`\n\n## `Include/pybuffer.h` (11)\n\n- `PyBuffer_FillContiguousStrides`\n- `PyBuffer_FillInfo`\n- `PyBuffer_FromContiguous`\n- `PyBuffer_GetPointer`\n- `PyBuffer_IsContiguous`\n- `PyBuffer_Release`\n- `PyBuffer_SizeFromFormat`\n- `PyBuffer_ToContiguous`\n- `PyObject_CheckBuffer`\n- `PyObject_CopyData`\n- `PyObject_GetBuffer`\n\n## `Include/pycapsule.h` (3)\n\n- `PyCapsule_GetDestructor`\n- `PyCapsule_SetDestructor`\n- `PyCapsule_SetName`\n\n## `Include/pyerrors.h` (11)\n\n- `PyErr_Format`\n- `PyErr_FormatV`\n- `PyErr_NormalizeException`\n- `PyErr_ProgramText`\n- `PyErr_SetImportError`\n- `PyErr_SetImportErrorSubclass`\n- `PyErr_SyntaxLocation`\n- `PyErr_SyntaxLocationEx`\n- `PyExceptionClass_Name`\n- `PyOS_snprintf`\n- `PyOS_vsnprintf`\n\n## `Include/pylifecycle.h` (10)\n\n- `PyOS_getsig`\n- `PyOS_setsig`\n- `Py_AtExit`\n- `Py_BytesMain`\n- `Py_EndInterpreter`\n- `Py_Exit`\n- `Py_Main`\n- `Py_NewInterpreter`\n- `Py_SetProgramName`\n- `Py_SetPythonHome`\n\n## `Include/pymacro.h` (2)\n\n- `Py_PACK_FULL_VERSION`\n- `Py_PACK_VERSION`\n\n## `Include/pystate.h` (27)\n\n- `PyGILState_GetThisThreadState`\n- `PyInterpreterGuard_Close`\n- `PyInterpreterGuard_FromCurrent`\n- `PyInterpreterGuard_FromView`\n- `PyInterpreterState_Clear`\n- `PyInterpreterState_Delete`\n- `PyInterpreterState_GetDict`\n- `PyInterpreterState_New`\n- `PyInterpreterView_Close`\n- `PyInterpreterView_FromCurrent`\n- `PyInterpreterView_FromMain`\n- `PyState_AddModule`\n- `PyState_FindModule`\n- `PyState_RemoveModule`\n- `PyThreadState_Clear`\n- `PyThreadState_Delete`\n- `PyThreadState_Ensure`\n- `PyThreadState_EnsureFromView`\n- `PyThreadState_Get`\n- `PyThreadState_GetDict`\n- `PyThreadState_GetFrame`\n- `PyThreadState_GetID`\n- `PyThreadState_GetInterpreter`\n- `PyThreadState_New`\n- `PyThreadState_Release`\n- `PyThreadState_SetAsyncExc` (deprecated)\n- `PyThreadState_Swap`\n\n## `Include/pystrtod.h` (2)\n\n- `PyOS_double_to_string`\n- `PyOS_string_to_double`\n\n## `Include/pythonrun.h` (3)\n\n- `PyErr_Display` (deprecated)\n- `PyErr_Print`\n- `PyOS_CheckStack`\n\n## `Include/pythread.h` (8)\n\n- `PyThread_GetInfo`\n- `PyThread_tss_alloc`\n- `PyThread_tss_create`\n- `PyThread_tss_delete`\n- `PyThread_tss_free`\n- `PyThread_tss_get`\n- `PyThread_tss_is_created`\n- `PyThread_tss_set`\n\n## `Include/refcount.h` (3)\n\n- `Py_DecRef`\n- `Py_IncRef`\n- `Py_XNewRef`\n\n## `Include/sliceobject.h` (2)\n\n- `PySlice_GetIndices`\n- `PySlice_GetIndicesEx` (deprecated)\n\n## `Include/structseq.h` (4)\n\n- `PyStructSequence_GetItem`\n- `PyStructSequence_New`\n- `PyStructSequence_NewType`\n- `PyStructSequence_SetItem`\n\n## `Include/sysmodule.h` (13)\n\n- `PySys_FormatStderr`\n- `PySys_FormatStdout`\n- `PySys_GetAttr`\n- `PySys_GetAttrString`\n- `PySys_GetObject`\n- `PySys_GetOptionalAttr`\n- `PySys_GetOptionalAttrString`\n- `PySys_GetXOptions`\n- `PySys_SetArgv`\n- `PySys_SetArgvEx`\n- `PySys_SetObject`\n- `PySys_WriteStderr`\n- `PySys_WriteStdout`\n\n## `Include/traceback.h` (1)\n\n- `PyTraceBack_Here`\n\n## `Include/unicodeobject.h` (72)\n\n- `PyUnicode_Append`\n- `PyUnicode_AppendAndDel`\n- `PyUnicode_AsASCIIString`\n- `PyUnicode_AsCharmapString`\n- `PyUnicode_AsLatin1String`\n- `PyUnicode_AsMBCSString`\n- `PyUnicode_AsRawUnicodeEscapeString`\n- `PyUnicode_AsUCS4`\n- `PyUnicode_AsUCS4Copy`\n- `PyUnicode_AsUTF16String`\n- `PyUnicode_AsUTF32String`\n- `PyUnicode_AsUnicodeEscapeString`\n- `PyUnicode_AsWideChar`\n- `PyUnicode_AsWideCharString` (deprecated)\n- `PyUnicode_BuildEncodingMap`\n- `PyUnicode_Compare`\n- `PyUnicode_CompareWithASCIIString`\n- `PyUnicode_Concat`\n- `PyUnicode_Contains`\n- `PyUnicode_Count`\n- `PyUnicode_Decode`\n- `PyUnicode_DecodeASCII`\n- `PyUnicode_DecodeCharmap`\n- `PyUnicode_DecodeCodePageStateful`\n- `PyUnicode_DecodeLatin1`\n- `PyUnicode_DecodeLocale`\n- `PyUnicode_DecodeLocaleAndSize` (deprecated)\n- `PyUnicode_DecodeMBCS`\n- `PyUnicode_DecodeMBCSStateful`\n- `PyUnicode_DecodeRawUnicodeEscape`\n- `PyUnicode_DecodeUTF16`\n- `PyUnicode_DecodeUTF16Stateful`\n- `PyUnicode_DecodeUTF32`\n- `PyUnicode_DecodeUTF32Stateful`\n- `PyUnicode_DecodeUTF7`\n- `PyUnicode_DecodeUTF7Stateful`\n- `PyUnicode_DecodeUTF8`\n- `PyUnicode_DecodeUTF8Stateful`\n- `PyUnicode_DecodeUnicodeEscape`\n- `PyUnicode_EncodeCodePage`\n- `PyUnicode_EncodeLocale` (deprecated)\n- `PyUnicode_Equal`\n- `PyUnicode_EqualToUTF8`\n- `PyUnicode_FSConverter`\n- `PyUnicode_FSDecoder`\n- `PyUnicode_Find`\n- `PyUnicode_FindChar` (deprecated)\n- `PyUnicode_Format`\n- `PyUnicode_FromFormat`\n- `PyUnicode_FromFormatV`\n- `PyUnicode_FromObject`\n- `PyUnicode_FromOrdinal`\n- `PyUnicode_FromString`\n- `PyUnicode_FromWideChar`\n- `PyUnicode_GetDefaultEncoding`\n- `PyUnicode_GetLength`\n- `PyUnicode_InternFromString`\n- `PyUnicode_IsIdentifier`\n- `PyUnicode_Join` (deprecated)\n- `PyUnicode_Partition`\n- `PyUnicode_RPartition`\n- `PyUnicode_RSplit`\n- `PyUnicode_ReadChar`\n- `PyUnicode_Replace`\n- `PyUnicode_Resize`\n- `PyUnicode_RichCompare`\n- `PyUnicode_Split`\n- `PyUnicode_Splitlines`\n- `PyUnicode_Substring`\n- `PyUnicode_Tailmatch`\n- `PyUnicode_Translate`\n- `PyUnicode_WriteChar`\n\n## `Include/warnings.h` (2)\n\n- `PyErr_ResourceWarning`\n- `PyErr_WarnFormat`\n","author":{"url":"https://github.com/bschoenmaeckers","@type":"Person","name":"bschoenmaeckers"},"datePublished":"2026-06-24T11:01:17.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/8156/RustPython/issues/8156"}