Add PyTuple_FromArray() function (#154)

Author: vstinner

docs/api.rst

@@ -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>`__.
@@ -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

docs/changelog.rst

@@ -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()``

pythoncapi_compat.h

@@ -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

tests/test_pythoncapi_compat_cext.c

@@ -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},
@@ -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}
 };