Irit Katriel <iritkatr...@gmail.com> added the comment:
We could make the error message less wrong:
>>> p.parse_args(['d'])
usage: [-h] {a,b,c}
: error: argument a: invalid choice: 'd' (choose a value in 'abc')
% git diff
diff --git a/Lib/argparse.py b/Lib/argparse.py
index b44fa4f0f6..f03cc1f110 100644
--- a/Lib/argparse.py
+++ b/Lib/argparse.py
@@ -2499,8 +2499,8 @@ def _check_value(self, action, value):
# converted value must be one of the choices (if specified)
if action.choices is not None and value not in action.choices:
args = {'value': value,
- 'choices': ', '.join(map(repr, action.choices))}
- msg = _('invalid choice: %(value)r (choose from %(choices)s)')
+ 'choices': repr(action.choices)}
+ msg = _('invalid choice: %(value)r (choose a value in
%(choices)s)')
raise ArgumentError(action, msg % args)
# =======================
----------
nosy: +iritkatriel
versions: +Python 3.10, Python 3.11, Python 3.9 -Python 2.7, Python 3.2, Python
3.3, Python 3.4
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<https://bugs.python.org/issue16977>
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