gh-129911: pygettext: Fix the keyword entry in help output (GH-129914)

Author: tomasr8

Lib/test/test_tools/test_i18n.py

@@ -413,6 +413,12 @@ def test_files_list(self):
             self.assertIn(f'msgid "{text2}"', data)
             self.assertNotIn(text3, data)
 
+    def test_help_text(self):
+        """Test that the help text is displayed."""
+        res = assert_python_ok(self.script, '--help')
+        self.assertEqual(res.out, b'')
+        self.assertIn(b'pygettext -- Python equivalent of xgettext(1)', res.err)
+
     def test_error_messages(self):
         """Test that pygettext outputs error messages to stderr."""
         stderr = self.get_stderr(dedent('''\

Misc/NEWS.d/next/Tools-Demos/2025-02-09-20-29-06.gh-issue-129911.uMFtf1.rst

@@ -0,0 +1 @@
+Fix the keyword entry in the help output of :program:`pygettext`.

Tools/i18n/pygettext.py

@@ -67,7 +67,8 @@
     -k word
     --keyword=word
         Keywords to look for in addition to the default set, which are:
-        %(DEFAULTKEYWORDS)s
+        _, gettext, ngettext, pgettext, npgettext, dgettext, dngettext,
+        dpgettext, and dnpgettext.
 
         You can have multiple -k flags on the command line.
 
@@ -169,7 +170,7 @@
 
 
 def usage(code, msg=''):
-    print(__doc__ % globals(), file=sys.stderr)
+    print(__doc__, file=sys.stderr)
     if msg:
         print(msg, file=sys.stderr)
     sys.exit(code)