Argparse required arguments incorrectly displayed as optional arguments

[rhettinger]

BPO	15336
Nosy	@rhettinger, @ezio-melotti, @merwok
Superseder	bpo-9694: argparse required arguments displayed under "optional arguments"

^{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 = <Date 2012-07-22.23:39:04.720>
created_at = <Date 2012-07-12.19:43:34.276>
labels = ['type-bug', 'library']
title = 'Argparse required arguments incorrectly displayed as optional arguments'
updated_at = <Date 2012-07-22.23:39:04.719>
user = 'https://github.com/rhettinger'

bugs.python.org fields:

activity = <Date 2012-07-22.23:39:04.719>
actor = 'bethard'
assignee = 'none'
closed = True
closed_date = <Date 2012-07-22.23:39:04.720>
closer = 'bethard'
components = ['Library (Lib)']
creation = <Date 2012-07-12.19:43:34.276>
creator = 'rhettinger'
dependencies = []
files = []
hgrepos = []
issue_num = 15336
keywords = []
message_count = 1.0
messages = ['165331']
nosy_count = 4.0
nosy_names = ['rhettinger', 'bethard', 'ezio.melotti', 'eric.araujo']
pr_nums = []
priority = 'normal'
resolution = 'duplicate'
stage = 'needs patch'
status = 'closed'
superseder = '9694'
type = 'behavior'
url = 'https://bugs.python.org/issue15336'
versions = ['Python 2.7', 'Python 3.2', 'Python 3.3']

[rhettinger]

In this script, '-x' is required argument:
------------------------------------------

import argparse
p = argparse.ArgumentParser()
p.add_argument('-x', required=True)
p.print_help()

However, the automatically generated help shows it as optional:
---------------------------------------------------------------
usage: ap_demo.py [-h] -x X

optional arguments:
-h, --help show this help message and exit
-x X