[issue37227] Wrong parse long argument

[chr0139]

New submission from chr0139 <marek.chrastina at vsb.cz>:

I have this script

import argparse
parser = argparse.ArgumentParser()
group = parser.add_mutually_exclusive_group()
group.add_argument('-l', '--list', action='store_true', help="show help")
group.add_argument('-u', '--upgrade', action='store_true', help="show help")
parser.parse_args(['--li'])

and this is the unexpected result:

Namespace(list=True, upgrade=False)

----------
components: Library (Lib)
messages: 345203
nosy: chr0139
priority: normal
severity: normal
status: open
title: Wrong parse long argument
type: behavior
versions: Python 2.7

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue37227>
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