From 3a570c6d58bd5ad7d7c13b24dafccc2701081d9f Mon Sep 17 00:00:00 2001
From: 9cel <9based@gmail.com>
Date: Sat, 11 Jan 2025 05:17:35 -0400
Subject: Make the Python CLI error message style more consistent (GH-128129)

---
 Lib/test/test_cmd_line.py | 2 +-
 Python/getopt.c           | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/Lib/test/test_cmd_line.py b/Lib/test/test_cmd_line.py
index 634efda..dfdbb80 100644
--- a/Lib/test/test_cmd_line.py
+++ b/Lib/test/test_cmd_line.py
@@ -1012,7 +1012,7 @@ class CmdLineTest(unittest.TestCase):
                               stdout=subprocess.PIPE,
                               stderr=subprocess.PIPE,
                               text=True)
-        err_msg = "unknown option --unknown-option\nusage: "
+        err_msg = "Unknown option: --unknown-option\nusage: "
         self.assertTrue(proc.stderr.startswith(err_msg), proc.stderr)
         self.assertNotEqual(proc.returncode, 0)
 
diff --git a/Python/getopt.c b/Python/getopt.c
index f64c89f..39a6938 100644
--- a/Python/getopt.c
+++ b/Python/getopt.c
@@ -102,7 +102,7 @@ int _PyOS_GetOpt(Py_ssize_t argc, wchar_t * const *argv, int *longindex)
         // Parse long option.
         if (*opt_ptr == L'\0') {
             if (_PyOS_opterr) {
-                fprintf(stderr, "expected long option\n");
+                fprintf(stderr, "Expected long option\n");
             }
             return -1;
         }
@@ -114,7 +114,7 @@ int _PyOS_GetOpt(Py_ssize_t argc, wchar_t * const *argv, int *longindex)
         }
         if (!opt->name) {
             if (_PyOS_opterr) {
-                fprintf(stderr, "unknown option %ls\n", argv[_PyOS_optind - 1]);
+                fprintf(stderr, "Unknown option: %ls\n", argv[_PyOS_optind - 1]);
             }
             return '_';
         }
-- 
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