bpo-29553: Fix ArgumentParser.format_usage() for mutually exclusive groups (GH-14976)

Co-authored-by: Andrew Nester <andrew.nester.dev@gmail.com>
2025-08-31 05:58:33 +00:00 · 2019-08-25 21:06:45 +02:00 · 2019-08-25 21:06:45 +02:00 · da27d9b9dc
commit da27d9b9dc
parent 5dbe0f59b7
3 changed files with 50 additions and 2 deletions
--- a/Lib/argparse.py
+++ b/Lib/argparse.py
@ -404,13 +404,19 @@ class HelpFormatter(object):
                            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] = '|'