diff --git a/Lib/argparse.py b/Lib/argparse.py
index a6ab3b3b898d4b..456ec8bb7fc86a 100644
--- a/Lib/argparse.py
+++ b/Lib/argparse.py
@@ -405,13 +405,19 @@ def _format_actions_usage(self, actions, groups):
inserts[start] += ' ['
else:
inserts[start] = '['
- inserts[end] = ']'
+ if end in inserts:
+ inserts[end] += ']'
+ else:
+ inserts[end] = ']'
else:
if start in inserts:
inserts[start] += ' ('
else:
inserts[start] = '('
- inserts[end] = ')'
+ if end in inserts:
+ inserts[end] += ')'
+ else:
+ inserts[end] = ')'
for i in range(start + 1, end):
inserts[i] = '|'
diff --git a/Lib/test/test_argparse.py b/Lib/test/test_argparse.py
index d6d16090eb0260..86ec6cca51acc4 100644
--- a/Lib/test/test_argparse.py
+++ b/Lib/test/test_argparse.py
@@ -2813,6 +2813,46 @@ def get_parser(self, required):
-c c help
'''
+class TestMutuallyExclusiveNested(MEMixin, TestCase):
+
+ def get_parser(self, required):
+ parser = ErrorRaisingArgumentParser(prog='PROG')
+ group = parser.add_mutually_exclusive_group(required=required)
+ group.add_argument('-a')
+ group.add_argument('-b')
+ group2 = group.add_mutually_exclusive_group(required=required)
+ group2.add_argument('-c')
+ group2.add_argument('-d')
+ group3 = group2.add_mutually_exclusive_group(required=required)
+ group3.add_argument('-e')
+ group3.add_argument('-f')
+ return parser
+
+ usage_when_not_required = '''\
+ usage: PROG [-h] [-a A | -b B | [-c C | -d D | [-e E | -f F]]]
+ '''
+ usage_when_required = '''\
+ usage: PROG [-h] (-a A | -b B | (-c C | -d D | (-e E | -f F)))
+ '''
+
+ help = '''\
+
+ optional arguments:
+ -h, --help show this help message and exit
+ -a A
+ -b B
+ -c C
+ -d D
+ -e E
+ -f F
+ '''
+
+ # We are only interested in testing the behavior of format_usage().
+ test_failures_when_not_required = None
+ test_failures_when_required = None
+ test_successes_when_not_required = None
+ test_successes_when_required = None
+
# =================================================
# Mutually exclusive group in parent parser tests
# =================================================
pFad - Phonifier reborn
Pfad - The Proxy pFad of © 2024 Garber Painting. All rights reserved.
Note: This service is not intended for secure transactions such as banking, social media, email, or purchasing. Use at your own risk. We assume no liability whatsoever for broken pages.
Alternative Proxies:
Alternative Proxy
pFad Proxy
pFad v3 Proxy
pFad v4 Proxy