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bpo-26952: [argparse] clearer error when formatting an empty mutually… (GH-30099) (GH-30115)

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(cherry picked from commit 86de99588d)

Co-authored-by: Irit Katriel <1055913+iritkatriel@users.noreply.github.com>
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Miss Islington (bot) 2021-12-15 04:24:48 -08:00 • committed by GitHub
parent 17260e44b5
commit f0b274d2e2
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Lib/argparse.py
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@ -392,6 +392,9 @@ def _format_actions_usage(self, actions, groups):
group_actions = set()
inserts = {}
for group in groups:
if not group._group_actions:
raise ValueError(f'empty group {group}')
try:
start = actions.index(group._group_actions[0])
except ValueError: