[3.14] pythongh-143331: Schedule to remove format "N" for Decimal (pythonGH-143372)

(cherry picked from commit dd750b3)

Co-authored-by: Semyon Moroz <[email protected]>

Author: donbarbos

Doc/deprecations/index.rst

@@ -7,6 +7,8 @@ Deprecations
 
 .. include:: pending-removal-in-3.17.rst
 
+.. include:: pending-removal-in-3.18.rst
+
 .. include:: pending-removal-in-3.19.rst
 
 .. include:: pending-removal-in-future.rst

Doc/deprecations/pending-removal-in-3.18.rst

@@ -0,0 +1,9 @@
+Pending removal in Python 3.18
+------------------------------
+
+* :mod:`decimal`:
+
+  * The non-standard and undocumented :class:`~decimal.Decimal` format
+    specifier ``'N'``, which is only supported in the :mod:`!decimal` module's
+    C implementation, has been deprecated since Python 3.13.
+    (Contributed by Serhiy Storchaka in :gh:`89902`.)

Doc/whatsnew/3.13.rst

@@ -1861,6 +1861,7 @@ New Deprecations
   * Deprecate the non-standard and undocumented :class:`~decimal.Decimal`
     format specifier ``'N'``,
     which is only supported in the :mod:`!decimal` module's C implementation.
+    Scheduled to be removed in Python 3.18.
     (Contributed by Serhiy Storchaka in :gh:`89902`.)
 
 * :mod:`dis`:
@@ -2025,6 +2026,10 @@ New Deprecations
 
 .. include:: ../deprecations/pending-removal-in-3.17.rst
 
+.. include:: ../deprecations/pending-removal-in-3.18.rst
+
+.. include:: ../deprecations/pending-removal-in-3.19.rst
+
 .. include:: ../deprecations/pending-removal-in-future.rst
 
 CPython Bytecode Changes

Doc/whatsnew/3.14.rst

@@ -2718,6 +2718,8 @@ New deprecations
 
 .. include:: ../deprecations/pending-removal-in-3.17.rst
 
+.. include:: ../deprecations/pending-removal-in-3.18.rst
+
 .. include:: ../deprecations/pending-removal-in-3.19.rst
 
 .. include:: ../deprecations/pending-removal-in-future.rst

Modules/_decimal/_decimal.c

@@ -3552,7 +3552,8 @@ dec_format(PyObject *dec, PyObject *args)
 
         if (size > 0 && fmt[size-1] == 'N') {
             if (PyErr_WarnEx(PyExc_DeprecationWarning,
-                             "Format specifier 'N' is deprecated", 1) < 0) {
+                             "Format specifier 'N' is deprecated and "
+                             "slated for removal in Python 3.18", 1) < 0) {
                 return NULL;
             }
         }