Latest update: 2026-06-30

Goal

Track 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_/*).

Missing Stable ABI Functions by Header

Derived from CPython Misc/stable_abi.toml and compared against exported C-API functions in RustPython crates/capi/src.

This list includes only functions that are still candidates for implementation in RustPython C-API:

• starts from all [function.*] entries in Misc/stable_abi.toml
• removes private functions (names starting with _)
• removes functions already implemented in RustPython crates/capi/src
• removes functions marked removed in CPython "What's New" C-API notes across Python 3.0 through 3.15
• marks remaining deprecated or soft-deprecated functions as (deprecated)
• groups remaining functions by CPython Include/*.h header, using RustPython's existing crates/capi/src file split (including abstract_/*)

Total missing: 436

Include/abstract.h -> crates/capi/src/abstract_.rs (10)

• PyObject_CallFunction
• PyObject_CallFunctionObjArgs
• PyObject_CallMethod
• PyVectorcall_NARGS

Include/abstract.h -> crates/capi/src/abstract_/iter.rs (2)

• PyAIter_Check
• PyObject_GetAIter

Include/abstract.h -> crates/capi/src/abstract_/number.rs (2)

• PyNumber_AsSsize_t
• PyNumber_ToBase

Include/abstract.h -> crates/capi/src/abstract_/sequence.rs (1)

• PySequence_Fast

Include/audit.h (2)

• PySys_Audit
• PySys_AuditTuple

Include/bytearrayobject.h (1)

• PyByteArray_Concat

Include/bytesobject.h (9)

• PyBytes_AsStringAndSize
• PyBytes_Concat
• PyBytes_ConcatAndDel
• PyBytes_DecodeEscape
• PyBytes_FromFormat
• PyBytes_FromFormatV
• PyBytes_FromObject
• PyBytes_FromString
• PyBytes_Repr

Include/ceval.h (17)

• PyEval_EvalCodeEx
• PyEval_EvalFrame
• PyEval_EvalFrameEx
• PyEval_GetFrame
• PyEval_GetFrameBuiltins
• PyEval_GetFrameGlobals
• PyEval_GetFrameLocals
• PyEval_GetFuncDesc
• PyEval_GetFuncName
• PyEval_GetGlobals (deprecated)
• PyEval_GetLocals (deprecated)
• PyEval_ReleaseThread
• Py_AddPendingCall
• Py_GetRecursionLimit
• Py_LeaveRecursiveCall
• Py_MakePendingCalls
• Py_SetRecursionLimit

Include/codecs.h (19)

• PyCodec_BackslashReplaceErrors
• PyCodec_Decode
• PyCodec_Decoder
• PyCodec_Encode
• PyCodec_Encoder
• PyCodec_IgnoreErrors
• PyCodec_IncrementalDecoder
• PyCodec_IncrementalEncoder
• PyCodec_KnownEncoding
• PyCodec_LookupError
• PyCodec_NameReplaceErrors
• PyCodec_Register
• PyCodec_RegisterError
• PyCodec_ReplaceErrors
• PyCodec_StreamReader
• PyCodec_StreamWriter
• PyCodec_StrictErrors
• PyCodec_Unregister
• PyCodec_XMLCharRefReplaceErrors

Include/cpython/initconfig.h (1)

• Py_GetArgcArgv

Include/cpython/marshal.h (2)

• PyMarshal_ReadObjectFromString
• PyMarshal_WriteObjectToString

Include/cpython/pystate.h (1)

• PyThreadState_DeleteCurrent

Include/descrobject.h (7)

• PyDescr_NewClassMethod
• PyDescr_NewGetSet
• PyDescr_NewMember
• PyDescr_NewMethod
• PyMember_GetOne (deprecated)
• PyMember_SetOne (deprecated)
• PyWrapper_New

Include/dictobject.h (7)

• PyDict_Clear
• PyDict_DelItemString
• PyDict_GetItem
• PyDict_GetItemString
• PyDict_GetItemStringRef
• PyDict_GetItemWithError
• PyDict_SetItemString

Include/fileobject.h (5)

• PyFile_FromFd
• PyFile_GetLine
• PyFile_WriteObject
• PyFile_WriteString
• PyObject_AsFileDescriptor

Include/fileutils.h (2)

• Py_DecodeLocale (deprecated)
• Py_EncodeLocale (deprecated)

Include/floatobject.h (0)

Include/import.h (17)

• PyImport_AddModule
• PyImport_AddModuleObject
• PyImport_AppendInittab
• PyImport_ExecCodeModule
• PyImport_ExecCodeModuleObject
• PyImport_ExecCodeModuleWithPathnames
• PyImport_GetImporter
• PyImport_GetMagicNumber
• PyImport_GetMagicTag
• PyImport_GetModule (deprecated)
• PyImport_GetModuleDict
• PyImport_ImportFrozenModule
• PyImport_ImportFrozenModuleObject
• PyImport_ImportModule (deprecated)
• PyImport_ImportModuleLevel
• PyImport_ImportModuleLevelObject
• PyImport_ReloadModule

Include/intrcheck.h (5)

• PyOS_AfterFork (deprecated)
• PyOS_AfterFork_Child (deprecated)
• PyOS_AfterFork_Parent (deprecated)
• PyOS_BeforeFork (deprecated)
• PyOS_InterruptOccurred

Include/iterobject.h (2)

• PyCallIter_New
• PySeqIter_New

Include/listobject.h (1)

• PyList_GetItem

Include/longobject.h (16)

• PyLongWriter_Create
• PyLongWriter_Discard
• PyLongWriter_Finish
• PyLong_AsLongAndOverflow
• PyLong_AsLongLongAndOverflow
• PyLong_AsNativeBytes
• PyLong_Export
• PyLong_FreeExport
• PyLong_FromNativeBytes
• PyLong_FromUnsignedNativeBytes
• PyLong_GetInfo
• PyLong_GetNativeLayout
• PyOS_strtol
• PyOS_strtoul

Include/memoryobject.h (4)

• PyMemoryView_FromBuffer
• PyMemoryView_FromMemory
• PyMemoryView_FromObject
• PyMemoryView_GetContiguous

Include/methodobject.h (3)

• PyCFunction_GetFlags
• PyCFunction_GetFunction
• PyCFunction_GetSelf

Include/modsupport.h (21)

• PyABIInfo_Check
• PyArg_Parse
• PyArg_ParseTuple (deprecated)
• PyArg_ParseTupleAndKeywords
• PyArg_UnpackTuple
• PyArg_VaParse
• PyArg_VaParseTupleAndKeywords
• PyArg_ValidateKeywordArguments
• PyModule_Add (deprecated)
• PyModule_AddFunctions
• PyModule_AddIntConstant
• PyModule_AddObject (deprecated)
• PyModule_AddObjectRef (deprecated)
• PyModule_AddStringConstant
• PyModule_AddType
• PyModule_Create2
• PyModule_ExecDef (deprecated)
• PyModule_FromDefAndSpec2 (deprecated)
• PyModule_SetDocString
• Py_BuildValue
• Py_VaBuildValue

Include/moduleobject.h (11)

• PyModuleDef_Init
• PyModule_GetDef
• PyModule_GetDict
• PyModule_GetFilename
• PyModule_GetName
• PyModule_GetState
• PyModule_GetStateSize
• PyModule_GetState_DuringGC
• PyModule_GetToken
• PyModule_GetToken_DuringGC
• PyModule_New

Include/object.h (25)

• PyType_ClearCache
• PyType_FromMetaclass (deprecated)
• PyType_FromModuleAndSpec (deprecated)
• PyType_FromSlots
• PyType_FromSpec (deprecated)
• PyType_FromSpecWithBases (deprecated)
• PyType_GenericAlloc
• PyType_GenericNew
• PyType_GetBaseByToken
• PyType_GetBaseByToken_DuringGC
• PyType_GetModule
• PyType_GetModuleByDef
• PyType_GetModuleByToken
• PyType_GetModuleByToken_DuringGC
• PyType_GetModuleState
• PyType_GetModuleState_DuringGC
• PyType_GetModule_DuringGC
• PyType_GetTypeDataSize
• PyType_Modified
• PyType_Ready
• Py_SET_SIZE
• Py_SIZE

Include/objimpl.h (14)

• PyGC_Collect
• PyGC_Disable
• PyGC_Enable
• PyGC_IsEnabled
• PyObject_Calloc
• PyObject_Free
• PyObject_GC_Del
• PyObject_GC_IsFinalized
• PyObject_GC_IsTracked
• PyObject_GC_Track
• PyObject_Init
• PyObject_InitVar
• PyObject_Malloc (deprecated)
• PyObject_Realloc

Include/pybuffer.h (11)

• PyBuffer_FillContiguousStrides
• PyBuffer_FillInfo
• PyBuffer_FromContiguous
• PyBuffer_GetPointer
• PyBuffer_IsContiguous
• PyBuffer_Release
• PyBuffer_SizeFromFormat
• PyBuffer_ToContiguous
• PyObject_CheckBuffer
• PyObject_CopyData
• PyObject_GetBuffer

Include/pycapsule.h (3)

• PyCapsule_GetDestructor
• PyCapsule_SetDestructor
• PyCapsule_SetName

Include/pyerrors.h (62)

• PyErr_BadArgument
• PyErr_BadInternalCall
• PyErr_CheckSignals
• PyErr_Clear
• PyErr_ExceptionMatches
• PyErr_Fetch (deprecated)
• PyErr_Format
• PyErr_FormatV
• PyErr_GetExcInfo
• PyErr_GetHandledException
• PyErr_NoMemory
• PyErr_NormalizeException
• PyErr_ProgramText
• PyErr_Restore (deprecated)
• PyErr_SetExcFromWindowsErr
• PyErr_SetExcFromWindowsErrWithFilename
• PyErr_SetExcFromWindowsErrWithFilenameObject
• PyErr_SetExcFromWindowsErrWithFilenameObjects
• PyErr_SetExcInfo
• PyErr_SetFromErrno
• PyErr_SetFromErrnoWithFilename
• PyErr_SetFromErrnoWithFilenameObject
• PyErr_SetFromErrnoWithFilenameObjects
• PyErr_SetFromWindowsErr
• PyErr_SetFromWindowsErrWithFilename
• PyErr_SetHandledException
• PyErr_SetImportError
• PyErr_SetImportErrorSubclass
• PyErr_SetInterrupt
• PyErr_SetInterruptEx
• PyErr_SetNone
• PyErr_SyntaxLocation
• PyErr_SyntaxLocationEx
• PyExceptionClass_Name
• PyException_GetArgs
• PyException_SetArgs
• PyOS_snprintf
• PyOS_vsnprintf
• PyUnicodeDecodeError_GetEncoding
• PyUnicodeDecodeError_GetEnd
• PyUnicodeDecodeError_GetObject
• PyUnicodeDecodeError_GetReason
• PyUnicodeDecodeError_GetStart
• PyUnicodeDecodeError_SetEnd
• PyUnicodeDecodeError_SetReason
• PyUnicodeDecodeError_SetStart
• PyUnicodeEncodeError_GetEncoding
• PyUnicodeEncodeError_GetEnd
• PyUnicodeEncodeError_GetObject
• PyUnicodeEncodeError_GetReason
• PyUnicodeEncodeError_GetStart
• PyUnicodeEncodeError_SetEnd
• PyUnicodeEncodeError_SetReason
• PyUnicodeEncodeError_SetStart
• PyUnicodeTranslateError_GetEnd
• PyUnicodeTranslateError_GetObject
• PyUnicodeTranslateError_GetReason
• PyUnicodeTranslateError_GetStart
• PyUnicodeTranslateError_SetEnd
• PyUnicodeTranslateError_SetReason
• PyUnicodeTranslateError_SetStart
• Py_FatalError

Include/pyframe.h (2)

• PyFrame_GetCode
• PyFrame_GetLineNumber

Include/pylifecycle.h (14)

• PyOS_getsig
• PyOS_setsig
• Py_AtExit
• Py_BytesMain
• Py_EndInterpreter
• Py_Exit
• Py_GetBuildInfo
• Py_GetCompiler
• Py_GetCopyright
• Py_GetPlatform
• Py_Main
• Py_NewInterpreter
• Py_SetProgramName
• Py_SetPythonHome

Include/pymacro.h (2)

• Py_PACK_FULL_VERSION
• Py_PACK_VERSION

Include/pystate.h (27)

• PyGILState_GetThisThreadState
• PyInterpreterGuard_Close
• PyInterpreterGuard_FromCurrent
• PyInterpreterGuard_FromView
• PyInterpreterState_Clear
• PyInterpreterState_Delete
• PyInterpreterState_GetDict
• PyInterpreterState_New
• PyInterpreterView_Close
• PyInterpreterView_FromCurrent
• PyInterpreterView_FromMain
• PyState_AddModule
• PyState_FindModule
• PyState_RemoveModule
• PyThreadState_Clear
• PyThreadState_Delete
• PyThreadState_Ensure
• PyThreadState_EnsureFromView
• PyThreadState_Get
• PyThreadState_GetDict
• PyThreadState_GetFrame
• PyThreadState_GetID
• PyThreadState_GetInterpreter
• PyThreadState_New
• PyThreadState_Release
• PyThreadState_SetAsyncExc (deprecated)
• PyThreadState_Swap

Include/pystrcmp.h (2)

• PyOS_mystricmp
• PyOS_mystrnicmp

Include/pystrtod.h (2)

• PyOS_double_to_string
• PyOS_string_to_double

Include/pythonrun.h (3)

• PyErr_Display (deprecated)
• PyErr_Print
• PyOS_CheckStack

Include/pythread.h (8)

• PyThread_GetInfo
• PyThread_tss_alloc
• PyThread_tss_create
• PyThread_tss_delete
• PyThread_tss_free
• PyThread_tss_get
• PyThread_tss_is_created
• PyThread_tss_set

Include/refcount.h (3)

• Py_DecRef
• Py_IncRef
• Py_XNewRef

Include/sliceobject.h (2)

• PySlice_GetIndices
• PySlice_GetIndicesEx (deprecated)

Include/structseq.h (4)

• PyStructSequence_GetItem
• PyStructSequence_New
• PyStructSequence_NewType
• PyStructSequence_SetItem

Include/sysmodule.h (13)

• PySys_FormatStderr
• PySys_FormatStdout
• PySys_GetAttr
• PySys_GetAttrString
• PySys_GetObject
• PySys_GetOptionalAttr
• PySys_GetOptionalAttrString
• PySys_GetXOptions
• PySys_SetArgv
• PySys_SetArgvEx
• PySys_SetObject
• PySys_WriteStderr
• PySys_WriteStdout

Include/traceback.h (1)

• PyTraceBack_Here

Include/unicodeobject.h (72)

• PyUnicode_Append
• PyUnicode_AppendAndDel
• PyUnicode_AsASCIIString
• PyUnicode_AsCharmapString
• PyUnicode_AsLatin1String
• PyUnicode_AsMBCSString
• PyUnicode_AsRawUnicodeEscapeString
• PyUnicode_AsUCS4
• PyUnicode_AsUCS4Copy
• PyUnicode_AsUTF16String
• PyUnicode_AsUTF32String
• PyUnicode_AsUnicodeEscapeString
• PyUnicode_AsWideChar
• PyUnicode_AsWideCharString (deprecated)
• PyUnicode_BuildEncodingMap
• PyUnicode_Compare
• PyUnicode_CompareWithASCIIString
• PyUnicode_Concat
• PyUnicode_Contains
• PyUnicode_Count
• PyUnicode_Decode
• PyUnicode_DecodeASCII
• PyUnicode_DecodeCharmap
• PyUnicode_DecodeCodePageStateful
• PyUnicode_DecodeLatin1
• PyUnicode_DecodeLocale
• PyUnicode_DecodeLocaleAndSize (deprecated)
• PyUnicode_DecodeMBCS
• PyUnicode_DecodeMBCSStateful
• PyUnicode_DecodeRawUnicodeEscape
• PyUnicode_DecodeUTF16
• PyUnicode_DecodeUTF16Stateful
• PyUnicode_DecodeUTF32
• PyUnicode_DecodeUTF32Stateful
• PyUnicode_DecodeUTF7
• PyUnicode_DecodeUTF7Stateful
• PyUnicode_DecodeUTF8
• PyUnicode_DecodeUTF8Stateful
• PyUnicode_DecodeUnicodeEscape
• PyUnicode_EncodeCodePage
• PyUnicode_EncodeLocale (deprecated)
• PyUnicode_Equal
• PyUnicode_EqualToUTF8
• PyUnicode_FSConverter
• PyUnicode_FSDecoder
• PyUnicode_Find
• PyUnicode_FindChar (deprecated)
• PyUnicode_Format
• PyUnicode_FromFormat
• PyUnicode_FromFormatV
• PyUnicode_FromObject
• PyUnicode_FromOrdinal
• PyUnicode_FromString
• PyUnicode_FromWideChar
• PyUnicode_GetDefaultEncoding
• PyUnicode_GetLength
• PyUnicode_InternFromString
• PyUnicode_IsIdentifier
• PyUnicode_Join (deprecated)
• PyUnicode_Partition
• PyUnicode_RPartition
• PyUnicode_RSplit
• PyUnicode_ReadChar
• PyUnicode_Replace
• PyUnicode_Resize
• PyUnicode_RichCompare
• PyUnicode_Split
• PyUnicode_Splitlines
• PyUnicode_Substring
• PyUnicode_Tailmatch
• PyUnicode_Translate
• PyUnicode_WriteChar

Include/warnings.h (2)

• PyErr_ResourceWarning
• PyErr_WarnFormat