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

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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 4b3e975923)

Co-authored-by: tmblweed <tmblweed@users.noreply.github.com>
This commit is contained in:
Miss Islington (bot) 2019-08-01 22:16:44 -07:00 • committed by GitHub
parent 8399641c34
commit 1cc70322c9
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GPG key ID: 4AEE18F83AFDEB23
4 changed files with 38 additions and 4 deletions
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9
Lib/argparse.py
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@ -593,7 +593,10 @@ class HelpFormatter(object):
elif action.nargs == SUPPRESS:
result = ''
else:
formats = ['%s' for _ in range(action.nargs)]
try:
formats = ['%s' for _ in range(action.nargs)]
except TypeError:
raise ValueError("invalid nargs value") from None
result = ' '.join(formats) % get_metavar(action.nargs)
return result
@ -850,7 +853,7 @@ class _StoreAction(Action):
help=None,
metavar=None):
if nargs == 0:
raise ValueError('nargs for store actions must be > 0; if you '
raise ValueError('nargs for store actions must be != 0; if you '
'have nothing to store, actions such as store '
'true or store const may be more appropriate')
if const is not None and nargs != OPTIONAL:
@ -942,7 +945,7 @@ class _AppendAction(Action):
help=None,
metavar=None):
if nargs == 0:
raise ValueError('nargs for append actions must be > 0; if arg '
raise ValueError('nargs for append actions must be != 0; if arg '
'strings are not supplying the value to append, '
'the append const action may be more appropriate')
if const is not None and nargs != OPTIONAL: