…127935)Co-authored-by: Victor Stinner <vstinner@python.org>Co-authored-by: Kumar Aditya <kumaraditya@python.org>

…127935)Co-authored-by: Victor Stinner <vstinner@python.org>Co-authored-by: Kumar Aditya <kumaraditya@python.org>

…127935)Co-authored-by: Victor Stinner <vstinner@python.org>Co-authored-by: Kumar Aditya <kumaraditya@python.org>

sagemathgh-41021: Refactor ``atexit.pyx``    <!-- ^ Please provide a concise and informative title. --><!-- ^ Don't put issue numbers in the title, do this in the PRdescription below. --><!-- ^ For example, instead of "Fixessagemath#12345" use "Introduce new methodto calculate 1 + 2". --><!-- v Describe your changes below in detail. --><!-- v Why is this change required? What problem does it solve? --><!-- v If this PR resolves an open issue, please link to it here. Forexample, "Fixessagemath#12345". -->I have refactor the ``atexit.pyx`` since for python 3.14, the changes of``atexit`` is so much for supporting the nogil version.### Python<=3.13 Implementation:- The ``atexit`` module stores callbacks in a C array of structs(``atexit_callback``).- The structure is defined in C as:```typedef struct {  PyObject *func;    PyObject *args;    PyObject *kwargs;} atexit_callback;```- Callbacks are stored in the interp->atexit.callbacks field as a Carray- The array can be directly accessed from Cython code using pointerarithmetic### Python 3.14 Implementation:- The ``atexit`` module was refactored to use a Python ``PyList`` objectinstead of a C array.- The structure is now:```state.callbacks = [(func, args, kwargs), ...]  # A Python list of tuples```- In the C implementation, callbacks are managed with:```PyObject *callbacks;  // This is now a PyList```- Callbacks are inserted at the beginning (LIFO order) using``PyList_Insert(state->callbacks, 0, callback)``### 📝 Checklist<!-- Put an `x` in all the boxes that apply. -->- [x] The title is concise and informative.- [x] The description explains in detail what this PR is about.- [x] I have linked a relevant issue or discussion.- [ ] I have created tests covering the changes.- [ ] I have updated the documentation and checked the documentationpreview.### ⌛ Dependencies<!-- List all open PRs that this PR logically depends on. For example,--><!-- -sagemath#12345: short description why this is a dependency --><!-- -sagemath#34567: ... -->python/cpython@3b7668284d4461afpython/cpython#127935    URL:sagemath#41021Reported by: Chenxin ZhongReviewer(s): Copilot, da-woods

sagemathgh-41021: Refactor ``atexit.pyx``    <!-- ^ Please provide a concise and informative title. --><!-- ^ Don't put issue numbers in the title, do this in the PRdescription below. --><!-- ^ For example, instead of "Fixessagemath#12345" use "Introduce new methodto calculate 1 + 2". --><!-- v Describe your changes below in detail. --><!-- v Why is this change required? What problem does it solve? --><!-- v If this PR resolves an open issue, please link to it here. Forexample, "Fixessagemath#12345". -->I have refactor the ``atexit.pyx`` since for python 3.14, the changes of``atexit`` is so much for supporting the nogil version.### Python<=3.13 Implementation:- The ``atexit`` module stores callbacks in a C array of structs(``atexit_callback``).- The structure is defined in C as:```typedef struct {  PyObject *func;    PyObject *args;    PyObject *kwargs;} atexit_callback;```- Callbacks are stored in the interp->atexit.callbacks field as a Carray- The array can be directly accessed from Cython code using pointerarithmetic### Python 3.14 Implementation:- The ``atexit`` module was refactored to use a Python ``PyList`` objectinstead of a C array.- The structure is now:```state.callbacks = [(func, args, kwargs), ...]  # A Python list of tuples```- In the C implementation, callbacks are managed with:```PyObject *callbacks;  // This is now a PyList```- Callbacks are inserted at the beginning (LIFO order) using``PyList_Insert(state->callbacks, 0, callback)``### 📝 Checklist<!-- Put an `x` in all the boxes that apply. -->- [x] The title is concise and informative.- [x] The description explains in detail what this PR is about.- [x] I have linked a relevant issue or discussion.- [ ] I have created tests covering the changes.- [ ] I have updated the documentation and checked the documentationpreview.### ⌛ Dependencies<!-- List all open PRs that this PR logically depends on. For example,--><!-- -sagemath#12345: short description why this is a dependency --><!-- -sagemath#34567: ... -->python/cpython@3b7668284d4461afpython/cpython#127935    URL:sagemath#41021Reported by: Chenxin ZhongReviewer(s): Copilot, da-woods