[issue31360] argparse mutually_exclusive_group under add_argument_group fails if part of parent_processor

[Martin Panter]

Martin Panter added the comment:

Seems the same as two other open bugs: Issue 25882 and Issue 16807.

--
nosy: +martin.panter
resolution:  -> duplicate
stage:  -> resolved
status: open -> closed
superseder:  -> argparse help error: arguments created by 
add_mutually_exclusive_group() are shown outside their parent group created by 
add_argument_group()

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[issue31360] argparse mutually_exclusive_group under add_argument_group fails if part of parent_processor

[Paul Traina (discontent)]

New submission from Paul Traina (discontent):

Hopefully I'm not being obtuse, but I seem to be getting incorrect/unexpected 
help output when using mutually_exclusive_group under an add_argument_group if 
this layering is happening in a parent parser.

Here's an example of the triggering usage:

import argparse

global_options = argparse.ArgumentParser(add_help=False)
global_options.add_argument('--summary', action='store_true', help='summarize 
information')
global_options.add_argument('--verbose', action='store_true', help='tell us 
more')

output_format = global_options.add_argument_group("Output format", "ways to 
foo")
styles = output_format.add_mutually_exclusive_group()
styles.add_argument('--plain', dest='style')
styles.add_argument('--green', dest='style')
styles.add_argument('--blue', dest='style')

parser = argparse.ArgumentParser()
commands = parser.add_subparsers()
hit = commands.add_parser('hit', parents=[global_options])
miss = commands.add_parser('miss', parents=[global_options])

print(parser.parse_args(['hit', '-h']))

which produces:

usage: bar.py hit [-h] [--summary] [--verbose]
  [--plain STYLE | --green STYLE | --blue STYLE]

optional arguments:
  -h, --help show this help message and exit
  --summary  summarize information
  --verbose  tell us more
  --plain STYLE
  --green STYLE
  --blue STYLE

Output format:
  ways to foo


"--plain" "--green" and "--blue" *should* be under "Output format"

--
components: Library (Lib)
messages: 301437
nosy: Paul Traina (discontent)
priority: normal
severity: normal
status: open
title: argparse mutually_exclusive_group under add_argument_group fails if part 
of parent_processor
type: behavior
versions: Python 3.6

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