Add missing py_ext module file.

crates/accelerate/src/quantum_circuit/py_ext.rs

@@ -0,0 +1,34 @@
+// This code is part of Qiskit.
+//
+// (C) Copyright IBM 2023
+//
+// This code is licensed under the Apache License, Version 2.0. You may
+// obtain a copy of this license in the LICENSE.txt file in the root directory
+// of this source tree or at http://www.apache.org/licenses/LICENSE-2.0.
+//
+// Any modifications or derivative works of this code must retain this
+// copyright notice, and modified files need to carry a notice indicating
+// that they have been altered from the originals.
+use pyo3::ffi::Py_ssize_t;
+use pyo3::prelude::*;
+use pyo3::types::{PyList, PyTuple};
+use pyo3::{ffi, AsPyPointer, PyNativeType};
+
+pub fn tuple_new(py: Python<'_>, items: Vec<PyObject>) -> Py<PyTuple> {
+    unsafe {
+        let ptr = ffi::PyTuple_New(items.len() as Py_ssize_t);
+        let tup: Py<PyTuple> = Py::from_owned_ptr(py, ptr);
+        for (i, obj) in items.into_iter().enumerate() {
+            ffi::PyTuple_SetItem(ptr, i as Py_ssize_t, obj.into_ptr());
+        }
+        tup
+    }
+}
+
+pub fn tuple_new_empty(py: Python<'_>) -> Py<PyTuple> {
+    unsafe { Py::from_owned_ptr(py, ffi::PyTuple_New(0)) }
+}
+
+pub fn tuple_from_list(list: &PyList) -> Py<PyTuple> {
+    unsafe { Py::from_owned_ptr(list.py(), ffi::PyList_AsTuple(list.as_ptr())) }
+}