gh-101640: Make argparse working in pythonw by dropping stderr writes there

[arhadthedev]

A note on freshly added tests:

• StdStreamTest.test_skip_invalid_stderr() is confirmed to be failing before the patch
• StdStreamTest.test_skip_invalid_stdout() is added for symmetry; its tested behavior already worked correctly

• Issue: argparse: Check if stderr is defined before writing to it #101640

[arhadthedev]

Ping?

[arhadthedev]

ping

[terryjreedy]

I am not sure who you are pinging, but... tests look OK to me. I just suggest catching any write error.

[bedevere-bot]

A Python core developer has requested some changes be made to your pull request before we can consider merging it. If you could please address their requests along with any other requests in other reviews from core developers that would be appreciated.

Once you have made the requested changes, please leave a comment on this pull request containing the phrase I have made the requested changes; please review again. I will then notify any core developers who have left a review that you're ready for them to take another look at this pull request.

[arhadthedev]

Retriggering the build to restart the failed docs/readthedocs.org:cpython-previews:

Running Sphinx v4.5.0
loading translations [en]... done

Traceback (most recent call last):
  File "/home/docs/checkouts/readthedocs.org/user_builds/cpython-previews/envs/101802/lib/python3.7/site-packages/sphinx/registry.py", line 425, in load_extension
    mod = import_module(extname)
  File "/home/docs/checkouts/readthedocs.org/user_builds/cpython-previews/envs/101802/lib/python3.7/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1006, in _gcd_import
  File "<frozen importlib._bootstrap>", line 983, in _find_and_load
  File "<frozen importlib._bootstrap>", line 967, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 677, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 728, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/home/docs/checkouts/readthedocs.org/user_builds/cpython-previews/envs/101802/lib/python3.7/site-packages/sphinx/builders/linkcheck.py", line 20, in <module>
    from requests import Response
  File "/home/docs/checkouts/readthedocs.org/user_builds/cpython-previews/envs/101802/lib/python3.7/site-packages/requests/__init__.py", line 43, in <module>
    import urllib3
  File "/home/docs/checkouts/readthedocs.org/user_builds/cpython-previews/envs/101802/lib/python3.7/site-packages/urllib3/__init__.py", line 39, in <module>
    "urllib3 v2.0 only supports OpenSSL 1.1.1+, currently "
ImportError: urllib3 v2.0 only supports OpenSSL 1.1.1+, currently the 'ssl' module is compiled with OpenSSL 1.0.2n  7 Dec 2017. See: https://github.com/urllib3/urllib3/issues/2168

[arhadthedev]

The docs deploy continues to fail. However, this PR doesn't change documentation so I believe it can be ignored for now.

For Bedevere: I have made the requested changes; please review again.

[bedevere-bot]

Thanks for making the requested changes!

@terryjreedy: please review the changes made to this pull request.

[miss-islington]

Thanks @arhadthedev for the PR, and @terryjreedy for merging it 🌮🎉.. I'm working now to backport this PR to: 3.11.
🐍🍒⛏🤖

[bedevere-bot]

GH-104250 is a backport of this pull request to the 3.11 branch.