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bpo-46080: fix argparse help generation exception in edge case (GH-30111)

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Fix an uncaught exception during help text generation when
argparse.BooleanOptionalAction is used with default=argparse.SUPPRESS
and help is specified.
(cherry picked from commit 9e87c0e03f)

Co-authored-by: Felix Fontein <felix@fontein.de>
This commit is contained in:
Miss Islington (bot) 2022-01-20 15:22:50 -08:00 • committed by GitHub
parent e8e71c481a
commit c6691a7ccb
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3 changed files with 9 additions and 3 deletions
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Lib/argparse.py
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@ -878,7 +878,7 @@ class BooleanOptionalAction(Action):
option_string = '--no-' + option_string[2:]
_option_strings.append(option_string)
if help is not None and default is not None:
if help is not None and default is not None and default is not SUPPRESS:
help += " (default: %(default)s)"
super().__init__(