bpo-16970: Adding error message for invalid args (GH-14844)


BPO -16970: Adding error message for invalid args

Applied the patch argparse-v2 patch issue 16970, ran patch check and the test suite, test_argparse with 0 errors

https://bugs.python.org/issue16970
(cherry picked from commit 4b3e97592376d5f8a3b75192b399a2da1be642cb)

Co-authored-by: tmblweed <tmblweed@users.noreply.github.com>
4 files changed