* Changes of the :c:type:`PyFrameObject` structure members:

* ``f_code``: removed, use :c:func:`PyFrame_GetCode` instead.

Warning: the function returns a :term:`strong reference`, need to call

:c:func:`Py_DECREF`.

* ``f_back``: changed, use :c:func:`PyFrame_GetBack`.

* ``f_builtins``: removed,

use ``PyObject_GetAttrString(frame, "f_builtins")``.

* ``f_globals``: removed,

use ``PyObject_GetAttrString(frame, "f_globals")``.

* ``f_locals``: removed,

use ``PyObject_GetAttrString(frame, "f_locals")``.

* ``f_lasti``: removed,

use ``PyObject_GetAttrString(frame, "f_lasti")``.

* ``f_valuesstack``: removed.

* ``f_stackdepth``: removed.

* ``f_gen``: removed.

* ``f_iblock``: removed.

* ``f_state``: removed.

* ``f_blockstack``: removed.

* ``f_localsplus``: removed.

The Python frame object is now created lazily. A side effect is that the

``f_back`` member must not be accessed directly, since its value is now also

computed lazily. The :c:func:`PyFrame_GetBack` function must be called

instead.

Code defining ``PyFrame_GetCode()`` on Python 3.8 and older::

Code defining ``PyFrame_GetBack()`` on Python 3.8 and older::

Or use `the pythoncapi_compat project

<https://github.com/pythoncapi/pythoncapi_compat>`__ to get these functions

on old Python functions.

* Changes of the :c:type:`PyThreadState` structure members:

* ``frame``: removed, use :c:func:`PyThreadState_GetFrame` (function added

to Python 3.9 by :issue:`40429`).

Warning: the function returns a :term:`strong reference`, need to call

:c:func:`Py_XDECREF`.

* ``tracing``: changed, use :c:func:`PyThreadState_EnterTracing`

and :c:func:`PyThreadState_LeaveTracing`

(functions added to Python 3.11 by :issue:`43760`).

* ``recursion_depth``: removed,

use ``(tstate->recursion_limit - tstate->recursion_remaining)`` instead.

* ``stackcheck_counter``: removed.

Code defining ``PyThreadState_GetFrame()`` on Python 3.8 and older::

Code defining ``PyThreadState_EnterTracing()`` and

``PyThreadState_LeaveTracing()`` on Python 3.10 and older::

Or use `the pythoncapi_compat project

<https://github.com/pythoncapi/pythoncapi_compat>`__ to get these functions

on old Python functions.