New submission from Federico Bond <federico.b...@gmail.com>:
The call to 'ngettext' in 'ArgumentParser._match_argument' (Lib/argparse.py)
uses a non-integer value, which causes it to fail with a nonsensical exception.
Non-integer values were deprecated in bpo-28692.
This happens because the 'default' error message is computed unconditionally,
even when the value of 'action.nargs' is 'None' and another message will be
ultimately selected.
This issue is similar to bpo-35785 which was not reproduced by other people at
the moment and was eventually closed. I could not create a short reproducer but
could match several of the points described in that issue. A little debugging
turned up that gettext was loading a catalog from the 'natural' PyPI package
which uses 'Plural-Forms' too.
File
"/usr/local/Cellar/python/3.7.5/Frameworks/Python.framework/Versions/3.7/lib/python3.7/argparse.py",
line 1755, in parse_args
args, argv = self.parse_known_args(args, namespace)
File
"/usr/local/Cellar/python/3.7.5/Frameworks/Python.framework/Versions/3.7/lib/python3.7/argparse.py",
line 1787, in parse_known_args
namespace, args = self._parse_known_args(args, namespace)
File
"/usr/local/Cellar/python/3.7.5/Frameworks/Python.framework/Versions/3.7/lib/python3.7/argparse.py",
line 1993, in _parse_known_args
start_index = consume_optional(start_index)
File
"/usr/local/Cellar/python/3.7.5/Frameworks/Python.framework/Versions/3.7/lib/python3.7/argparse.py",
line 1923, in consume_optional
arg_count = match_argument(action, selected_patterns)
File
"/usr/local/Cellar/python/3.7.5/Frameworks/Python.framework/Versions/3.7/lib/python3.7/argparse.py",
line 2086, in _match_argument
action.nargs) % action.nargs
File
"/usr/local/Cellar/python/3.7.5/Frameworks/Python.framework/Versions/3.7/lib/python3.7/gettext.py",
line 631, in ngettext
return dngettext(_current_domain, msgid1, msgid2, n)
File
"/usr/local/Cellar/python/3.7.5/Frameworks/Python.framework/Versions/3.7/lib/python3.7/gettext.py",
line 610, in dngettext
return t.ngettext(msgid1, msgid2, n)
File
"/usr/local/Cellar/python/3.7.5/Frameworks/Python.framework/Versions/3.7/lib/python3.7/gettext.py",
line 462, in ngettext
tmsg = self._catalog[(msgid1, self.plural(n))]
File "<string>", line 4, in func
File
"/usr/local/Cellar/python/3.7.5/Frameworks/Python.framework/Versions/3.7/lib/python3.7/gettext.py",
line 168, in _as_int
(n.__class__.__name__,)) from None
TypeError: Plural value must be an integer, got NoneType
----------
components: Library (Lib)
messages: 356761
nosy: Federico Bond
priority: normal
severity: normal
status: open
title: argparse calls ngettext with deprecated non-integer value
type: crash
versions: Python 3.8, Python 3.9
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue38821>
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