rimport: Fix help on older Pythons.

Author: samsrabin

rimport

@@ -37,7 +37,8 @@ def build_parser() -> argparse.ArgumentParser:
         argparse.ArgumentParser: Configured parser ready to parse command-line arguments.
     """
     parser = argparse.ArgumentParser(
-        description="Copy files from CESM inputdata directory to a publishing directory."
+        description="Copy files from CESM inputdata directory to a publishing directory.",
+        add_help=False,  # Disable automatic help to add custom -help flag
     )
 
     # Mutually exclusive: -file or -list (one required)
@@ -72,8 +73,14 @@ def build_parser() -> argparse.ArgumentParser:
         ),
     )
 
-    # Provide -help to mirror legacy behavior
-    parser.add_argument("-help", action="help", help=argparse.SUPPRESS)
+    # Provide -help to mirror legacy behavior (in addition to -h and --help)
+    parser.add_argument(
+        "-h",
+        "--help",
+        "-help",
+        action="help",
+        help="Show this help message and exit",
+    )
 
     return parser
 

tests/rimport/test_cmdline.py

@@ -264,7 +264,8 @@ def test_help_flag_shows_help(self, rimport_script, help_flag):
         # Help should exit with code 0
         assert result.returncode == 0
         assert "usage:" in result.stdout
-        assert "options:" in result.stdout
+        # Python 3.10+ uses "options:", earlier versions use "optional arguments:"
+        assert "options:" in result.stdout or "optional arguments:" in result.stdout
 
     def test_list_with_comments_and_blanks(self, rimport_script, test_env, rimport_env):
         """Test that list file with comments and blank lines works correctly."""