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Add PyTuple_FromArray() function#154

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Merged
vstinner merged 2 commits intopython:mainfromvstinner:fromarray
Oct 14, 2025
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30 changes: 17 additions & 13 deletionsdocs/api.rst
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Original file line numberDiff line numberDiff line change
Expand Up@@ -29,6 +29,21 @@ Latest version of the header file:
Python 3.15
-----------

.. c:function:: PyBytesWriter* PyBytesWriter_Create(Py_ssize_t size)
.. c:function:: void* PyBytesWriter_GetData(PyBytesWriter *writer)
.. c:function:: Py_ssize_t PyBytesWriter_GetSize(PyBytesWriter *writer)
.. c:function:: PyObject* PyBytesWriter_FinishWithSize(PyBytesWriter *writer, Py_ssize_t size)
.. c:function:: PyObject* PyBytesWriter_Finish(PyBytesWriter *writer)
.. c:function:: PyObject* PyBytesWriter_FinishWithPointer(PyBytesWriter *writer, void *buf)
.. c:function:: void PyBytesWriter_Discard(PyBytesWriter *writer)
.. c:function:: int PyBytesWriter_Resize(PyBytesWriter *writer, Py_ssize_t size)
.. c:function:: int PyBytesWriter_Grow(PyBytesWriter *writer, Py_ssize_t size)
.. c:function:: void* PyBytesWriter_GrowAndUpdatePointer(PyBytesWriter *writer, Py_ssize_t size, void *buf)
.. c:function:: int PyBytesWriter_WriteBytes(PyBytesWriter *writer, const void *bytes, Py_ssize_t size)
.. c:function:: int PyBytesWriter_Format(PyBytesWriter *writer, const char *format, ...)

See `PyBytesWriter documentation <https://docs.python.org/dev/c-api/bytes.html#pybyteswriter>`__.

.. c:function:: PyObject* PySys_GetAttr(const char *name)

See `PySys_GetAttr() documentation <https://docs.python.org/dev/c-api/sys.html#c.PySys_GetAttr>`__.
Expand All@@ -45,20 +60,9 @@ Python 3.15

See `PySys_GetOptionalAttrString() documentation <https://docs.python.org/dev/c-api/sys.html#c.PySys_GetOptionalAttrString>`__.

.. c:function:: PyBytesWriter* PyBytesWriter_Create(Py_ssize_t size)
.. c:function:: void* PyBytesWriter_GetData(PyBytesWriter *writer)
.. c:function:: Py_ssize_t PyBytesWriter_GetSize(PyBytesWriter *writer)
.. c:function:: PyObject* PyBytesWriter_FinishWithSize(PyBytesWriter *writer, Py_ssize_t size)
.. c:function:: PyObject* PyBytesWriter_Finish(PyBytesWriter *writer)
.. c:function:: PyObject* PyBytesWriter_FinishWithPointer(PyBytesWriter *writer, void *buf)
.. c:function:: void PyBytesWriter_Discard(PyBytesWriter *writer)
.. c:function:: int PyBytesWriter_Resize(PyBytesWriter *writer, Py_ssize_t size)
.. c:function:: int PyBytesWriter_Grow(PyBytesWriter *writer, Py_ssize_t size)
.. c:function:: void* PyBytesWriter_GrowAndUpdatePointer(PyBytesWriter *writer, Py_ssize_t size, void *buf)
.. c:function:: int PyBytesWriter_WriteBytes(PyBytesWriter *writer, const void *bytes, Py_ssize_t size)
.. c:function:: int PyBytesWriter_Format(PyBytesWriter *writer, const char *format, ...)
.. c:function:: PyObject* PyTuple_FromArray(PyObject *const *array, Py_ssize_t size)

See `PyBytesWriter documentation <https://docs.python.org/dev/c-api/bytes.html#pybyteswriter>`__.
See `PyTuple_FromArray() documentation <https://docs.python.org/dev/c-api/tuple.html#c.PyTuple_FromArray>`__.


Python 3.14
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3 changes: 2 additions & 1 deletiondocs/changelog.rst
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Original file line numberDiff line numberDiff line change
@@ -1,7 +1,8 @@
Changelog
=========

* 2025-11-18: Add PEP 782 functions:
* 2025-10-14: Add ``PyTuple_FromArray()`` function.
* 2025-09-18: Add PEP 782 functions:

* ``PyBytesWriter_Create()``
* ``PyBytesWriter_Discard()``
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17 changes: 17 additions & 0 deletionspythoncapi_compat.h
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Expand Up@@ -2553,6 +2553,23 @@ PyBytesWriter_Format(PyBytesWriter *writer, const char *format, ...)
#endif // PY_VERSION_HEX < 0x030F00A1


#if PY_VERSION_HEX < 0x030F00A1
static inline PyObject*
PyTuple_FromArray(PyObject *const *array, Py_ssize_t size)
{
PyObject *tuple = PyTuple_New(size);
if (tuple == NULL) {
return NULL;
}
for (Py_ssize_t i=0; i < size; i++) {
PyObject *item = array[i];
PyTuple_SET_ITEM(tuple, i, Py_NewRef(item));
}
return tuple;
}
#endif


#ifdef __cplusplus
}
#endif
Expand Down
49 changes: 49 additions & 0 deletionstests/test_pythoncapi_compat_cext.c
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Expand Up@@ -2392,6 +2392,54 @@ test_byteswriter(PyObject *Py_UNUSED(module), PyObject *Py_UNUSED(args))
}


static PyObject*
test_tuple_fromarray(void)
{
PyObject* array[] = {
PyLong_FromLong(1),
PyLong_FromLong(2),
PyLong_FromLong(3)
};
PyObject *tuple = PyTuple_FromArray(array, 3);
if (tuple == NULL) {
goto error;
}

assert(PyTuple_GET_SIZE(tuple) == 3);
assert(PyTuple_GET_ITEM(tuple, 0) == array[0]);
assert(PyTuple_GET_ITEM(tuple, 1) == array[1]);
assert(PyTuple_GET_ITEM(tuple, 2) == array[2]);

Py_DECREF(tuple);
Py_DECREF(array[0]);
Py_DECREF(array[1]);
Py_DECREF(array[2]);

// Test PyTuple_FromArray(NULL, 0)
tuple = PyTuple_FromArray(NULL, 0);
if (tuple == NULL) {
return NULL;
}
assert(PyTuple_GET_SIZE(tuple) == 0);
Py_DECREF(tuple);

Py_RETURN_NONE;

error:
Py_DECREF(array[0]);
Py_DECREF(array[1]);
Py_DECREF(array[2]);
return NULL;
}


static PyObject*
test_tuple(PyObject *Py_UNUSED(module), PyObject *Py_UNUSED(args))
{
return test_tuple_fromarray();
}


static struct PyMethodDef methods[] = {
{"test_object", test_object, METH_NOARGS, _Py_NULL},
{"test_py_is", test_py_is, METH_NOARGS, _Py_NULL},
Expand DownExpand Up@@ -2446,6 +2494,7 @@ static struct PyMethodDef methods[] = {
{"test_sys", test_sys, METH_NOARGS, _Py_NULL},
{"test_uniquely_referenced", test_uniquely_referenced, METH_NOARGS, _Py_NULL},
{"test_byteswriter", test_byteswriter, METH_NOARGS, _Py_NULL},
{"test_tuple", test_tuple, METH_NOARGS, _Py_NULL},
{_Py_NULL, _Py_NULL, 0, _Py_NULL}
};

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