argparse exclusive argument group error unintelligible

Bug report

Bug description:

    import argparse
    import os.path
    parser = argparse.ArgumentParser()
    parser.add_argument(
        "--debug",
        action="store_true",
        help="print out debugging information",
    )
    # Added optional branch argument
    parser.add_argument(
        "-b",
        "--branch",
        default="main",
        help="branch name to store commits in (default: main)",
    )
    parser.add_argument(
        "--non-interactive",
        action="store_true",
        help="disable interactive prompts for missing author information, pass --yes to lfs import",
    )
    parser.add_argument(
        "--template",
        default=os.path.join(
            os.path.dirname(__file__), "template"
        ),
        help="add files from this directory to every revision",
    )
    parser.add_argument(
        "--object-format",
        default="sha256",
        help="git object format to use (default: sha256)",
    )
    parser.add_argument(
        "--changelog",
        nargs="?",
        const=pkg_base,
        help="use changelog for commit messages, "
        f"package name is guessed ({pkg_base}) or can be specified",
    )
    repo_group = parser.add_mutually_exclusive_group(required=True)
    repo_group.add_argument(
        "--stdout",
        action="store_true",
        help="output git fast-import data to stdout",
    )
    repo_group.add_argument(
        "repository",
        nargs="?",
        help="import package into this git repository if --stdout is not given",
    )
    args = parser.parse_args()

$ python3 osc_fast_export.py 
usage: osc_fast_export.py [-h] [--debug] [-b BRANCH] [--non-interactive] [--template TEMPLATE]
                          [--object-format OBJECT_FORMAT] [--changelog [CHANGELOG]] (--stdout |
                          repository)
osc_fast_export.py: error: one of the arguments --stdout repository is required

The sentence

one of the arguments --stdout repository is required

is unintelligible. I wrote the code so I know why the output is like this but this is supposed to be read by a user who never looked at the code. The grammar of that sentence is broken.

CPython versions tested on:

3.13

Operating systems tested on:

Linux

Linked PRs

• gh-157134

レポートに示されている argparse の mutually exclusive-group エントリーポイントから始め、--stdout も repository も指定せずにコマンドを再現してください。結果として出力される必須引数の診断と既存のカバレッジを追跡します。完了条件は、ユーザー向けメッセージが文法的に正しく要件を明確に説明し、このケースの回帰テストがあることです。