gh-101865: Deprecate `co_lnotab` from code objects as per PEP 626 (#101866)

Co-authored-by: Oleg Iarygin <oleg@arhadthedev.net>

2 files changed, 8 insertions, 1 deletions

diff --git a/Doc/reference/datamodel.rst b/Doc/reference/datamodel.rst
index 1865d09..a09d552 100644
--- a/Doc/reference/datamodel.rst
+++ b/Doc/reference/datamodel.rst
@@ -991,7 +991,8 @@ Internal types
       the filename from which the code was compiled; :attr:`co_firstlineno` is
       the first line number of the function; :attr:`co_lnotab` is a string
       encoding the mapping from bytecode offsets to line numbers (for details
-      see the source code of the interpreter); :attr:`co_stacksize` is the
+      see the source code of the interpreter, is deprecated since 3.12
+      and may be removed in 3.14); :attr:`co_stacksize` is the
       required stack size; :attr:`co_flags` is an integer encoding a number
       of flags for the interpreter.
 
diff --git a/Doc/whatsnew/3.12.rst b/Doc/whatsnew/3.12.rst
index 3df3ef7..88b9982 100644
--- a/Doc/whatsnew/3.12.rst
+++ b/Doc/whatsnew/3.12.rst
@@ -622,6 +622,12 @@ Pending Removal in Python 3.14
   functions that have been deprecated since Python 2 but only gained a
   proper :exc:`DeprecationWarning` in 3.12. Remove them in 3.14.
 
+* Accessing ``co_lnotab`` was deprecated in :pep:`626` since 3.10
+  and was planned to be removed in 3.12
+  but it only got a proper :exc:`DeprecationWarning` in 3.12.
+  May be removed in 3.14.
+  (Contributed by Nikita Sobolev in :gh:`101866`.)
+
 * The *onerror* argument of :func:`shutil.rmtree` is deprecated in 3.12,
   and will be removed in 3.14.