document “--” as a way to distinguish option w/ narg='+' from positional argument in argparse

grayhemp

BPO	9182
Nosy	@freddrake, @rhettinger, @ericvsmith, @merwok, @berkerpeksag, @shihai1991, @jacksonriley, @ananthan-123, @slateny
PRs	bpo-9182: Add a section on specifying positional arguments #31810
Files	issue9182.patch

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2010-07-06.16:24:38.683>
labels = ['easy', 'type-bug', '3.9', 'docs']
title = "document \xe2\x80\x9c--\xe2\x80\x9d as a way to distinguish option w/ narg='+' from positional argument in argparse"
updated_at = <Date 2022-03-11.05:58:21.838>
user = 'https://bugs.python.org/grayhemp'

bugs.python.org fields:

activity = <Date 2022-03-11.05:58:21.838>
actor = 'slateny'
assignee = 'docs@python'
closed = False
closed_date = None
closer = None
components = ['Documentation']
creation = <Date 2010-07-06.16:24:38.683>
creator = 'gray_hemp'
dependencies = []
files = ['19732']
hgrepos = []
issue_num = 9182
keywords = ['patch', 'easy']
message_count = 21.0
messages = ['109402', '109412', '109420', '109423', '109425', '109426', '109427', '109431', '121519', '121532', '121534', '121724', '121850', '121891', '121893', '121935', '121950', '166243', '355749', '362151', '362265']
nosy_count = 14.0
nosy_names = ['fdrake', 'rhettinger', 'bethard', 'eric.smith', 'eric.araujo', 'docs@python', 'gray_hemp', 'Kotan', 'berker.peksag', 'paul.j3', 'shihai1991', 'jacksonriley', 'Ananthakrishnan', 'slateny']
pr_nums = ['31810']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue9182'
versions = ['Python 3.9']