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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"C API: Cython 3.0 uses private functions removed in Python 3.13 (numpy 1.25.1 fails to build)","articleBody":"numpy 1.25.1 fails to build on Python 3.13: Cython uses private C API removed in Python 3.13. Example of build errors.\r\n\r\nI open an issue since Python 3.13 does not provide obvious replacement for these removed functions.\r\n\r\n(1) Cython uses removed **_PyInterpreterState_GetConfig()**:\r\n\r\n```c\r\n  static void __Pyx_init_assertions_enabled(void) {\r\n    __pyx_assertions_enabled_flag = ! _PyInterpreterState_GetConfig(__Pyx_PyThreadState_Current-\u003einterp)-\u003eoptimization_level;\r\n  }\r\n```\r\n\r\n(2) Cython uses removed **_PyVectorcall_Function()** in __Pyx_PyObject_FastCallDict():\r\n\r\n```c\r\nstatic CYTHON_INLINE PyObject* __Pyx_PyObject_FastCallDict(PyObject *func, PyObject **args, size_t _nargs, PyObject *kwargs) {\r\n    ..\r\n    #if CYTHON_VECTORCALL\r\n    vectorcallfunc f = _PyVectorcall_Function(func);\r\n    if (f) {\r\n        return f(func, args, (size_t)nargs, kwargs);\r\n    }\r\n    ...\r\n}\r\n```\r\n\r\n(3) Cython uses removed **_PyUnicode_FastCopyCharacters()** in __Pyx_PyUnicode_ConcatInPlaceImpl()\r\n\r\n```c\r\nstatic CYTHON_INLINE PyObject *__Pyx_PyUnicode_ConcatInPlaceImpl(PyObject **p_left, PyObject *right\r\n        #if CYTHON_REFNANNY\r\n        , void* __pyx_refnanny\r\n        #endif\r\n    ) {\r\n        ...\r\n        // copy 'right' into the newly allocated area of 'left'\r\n        _PyUnicode_FastCopyCharacters(*p_left, left_len, right, 0, right_len);\r\n        return *p_left;\r\n        ...\r\n  }\r\n```\r\n\r\nBut also in __Pyx_PyUnicode_Join():\r\n\r\n```c\r\nstatic PyObject* __Pyx_PyUnicode_Join(PyObject* value_tuple, Py_ssize_t value_count, Py_ssize_t result_ulength,\r\n                                      Py_UCS4 max_char) {\r\n            ...\r\n            #if CYTHON_COMPILING_IN_CPYTHON \u0026\u0026 PY_VERSION_HEX \u003e= 0x030300F0 || defined(_PyUnicode_FastCopyCharacters)\r\n            _PyUnicode_FastCopyCharacters(result_uval, char_pos, uval, 0, ulength);\r\n            #else\r\n            ...\r\n}\r\n```","author":{"url":"https://github.com/vstinner","@type":"Person","name":"vstinner"},"datePublished":"2023-07-22T22:44:05.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":17},"url":"https://github.com/107076/cpython/issues/107076"}