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[3.11] gh-101640: Make argparse _print_message catch any write error (GH-101802) (#104250)

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gh-101640: Make argparse _print_message catch any write error (GH-101802)

* In particular, don't exit when trying to print to stderr = None.
* Add tests

(cherry picked from commit 42f54d1f92)

Co-authored-by: Oleg Iarygin <oleg@arhadthedev.net>
Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>
This commit is contained in:
Miss Islington (bot) 2023-05-06 16:17:27 -07:00 • committed by GitHub
parent 10ee19b737
commit cf1c25fd6e
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3 changed files with 37 additions and 3 deletions
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8
Lib/argparse.py
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@ -2602,9 +2602,11 @@ class ArgumentParser(_AttributeHolder, _ActionsContainer):
def _print_message(self, message, file=None):
if message:
if file is None:
file = _sys.stderr
file.write(message)
file = file or _sys.stderr
try:
file.write(message)
except (AttributeError, OSError):
pass
# ===============
# Exiting methods