From 92873c8a166119eff762ac1cf1481b282fbb4797 Mon Sep 17 00:00:00 2001
From: Serhiy Storchaka <storchaka@gmail.com>
Date: Fri, 5 Jun 2026 10:58:20 +0300
Subject: [PATCH] gh-62825: Fix encoding aliases "KS_C_5601-1987", "KS X 1001",
 etc (GH-150933)

They are now aliases of CP949 instead of EUC-KR.
(cherry picked from commit 45562c6f4f469e278a9c03c31c2cdadf8100d101)

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
---
 Lib/encodings/aliases.py                             | 12 ++++++------
 .../2026-06-04-23-10-31.gh-issue-62825.BtG_yQ.rst    |  2 ++
 2 files changed, 8 insertions(+), 6 deletions(-)
 create mode 100644 Misc/NEWS.d/next/Library/2026-06-04-23-10-31.gh-issue-62825.BtG_yQ.rst

diff --git a/Lib/encodings/aliases.py b/Lib/encodings/aliases.py
index e5e50630f33d14..df4c230fbf9c4e 100644
--- a/Lib/encodings/aliases.py
+++ b/Lib/encodings/aliases.py
@@ -226,6 +226,12 @@
 
     # cp949 codec
     '949'                : 'cp949',
+    'korean'             : 'cp949',
+    'ksc5601'            : 'cp949',
+    'ks_c_5601'          : 'cp949',
+    'ks_c_5601_1987'     : 'cp949',
+    'ksx1001'            : 'cp949',
+    'ks_x_1001'          : 'cp949',
     'ms949'              : 'cp949',
     'uhc'                : 'cp949',
 
@@ -248,12 +254,6 @@
 
     # euc_kr codec
     'euckr'              : 'euc_kr',
-    'korean'             : 'euc_kr',
-    'ksc5601'            : 'euc_kr',
-    'ks_c_5601'          : 'euc_kr',
-    'ks_c_5601_1987'     : 'euc_kr',
-    'ksx1001'            : 'euc_kr',
-    'ks_x_1001'          : 'euc_kr',
     'cseuckr'            : 'euc_kr',
 
     # gb18030 codec
diff --git a/Misc/NEWS.d/next/Library/2026-06-04-23-10-31.gh-issue-62825.BtG_yQ.rst b/Misc/NEWS.d/next/Library/2026-06-04-23-10-31.gh-issue-62825.BtG_yQ.rst
new file mode 100644
index 00000000000000..95a4fb1c61d4c3
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2026-06-04-23-10-31.gh-issue-62825.BtG_yQ.rst
@@ -0,0 +1,2 @@
+Encodings "KS_C_5601-1987", "KS X 1001", etc are now aliases of "CP949"
+instead of "EUC-KR".