8000 [mypyc] Fix bytes join on Python 3.13 by JukkaL · Pull Request #17527 · python/mypy · GitHub
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[mypyc] Fix bytes join on Python 3.13 #17527

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[mypyc] Fix bytes join on Python 3.13 #17527

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15 changes: 13 additions & 2 deletions mypyc/lib-rt/bytes_ops.c
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Original file line number Diff line number Diff line change
Expand Up @@ -95,15 +95,26 @@ PyObject *CPyBytes_GetSlice(PyObject *obj, CPyTagged start, CPyTagged end) {
return CPyObject_GetSlice(obj, start, end);
}

// Like _PyBytes_Join but fallback to dynamic call if 'sep' is not bytes
// (mostly commonly, for bytearrays)
PyObject *CPyBytes_Join(PyObject *sep, PyObject *iter) {
#if CPY_3_13_FEATURES
PyObject *args[2] = {sep, iter};
_Py_IDENTIFIER(join);
PyObject *method = _PyUnicode_FromId(&PyId_join); /* borrowed */
if (method == NULL) {
return NULL;
}
PyObject *res = PyObject_VectorcallMethod(
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This might fail with 3.8. PyObject_VectorcallMethod was provisional there. The leading underscore was removed in 3.9. _PyObject_VectorcallMethod is available as alias in 3.13 for backwards compatibility.

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@hauntsaninja hauntsaninja Jul 27, 2024 •
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This is guarded by CPY_3_13_FEATURES so should be fine on that front, right?

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True, missed that. Although now _PyBytes_Join doesn't need to be fixed for 3.13 anymore. See python/cpython#122287

method, args, 2 | PY_VECTORCALL_ARGUMENTS_OFFSET, NULL);
return res;
#else
// Fallback to dynamic call if 'sep' is not bytes (most commonly, for bytearrays)
if (PyBytes_CheckExact(sep)) {
return _PyBytes_Join(sep, iter);
} else {
_Py_IDENTIFIER(join);
return _PyObject_CallMethodIdOneArg(sep, &PyId_join, iter);
}
#endif
}

PyObject *CPyBytes_Build(Py_ssize_t len, ...) {
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