如果设置Metavar=''，则帮助行将变为：
-q , --queue Show information for <queue>
parser = argparse.ArgumentParser(description='Postfix Queue Administration Tool',
prog='pqa',
usage='%(prog)s [-h] [-v,--version]',
formatter_class=argparse.RawDescriptionHelpformatter,
)
parser.add_argument('-l', '--list', action='store_true',
help='Shows full overview of all queues')
g = parser.add_argument_group(title='information options',
description='''-q, --queue <queue> Show information for <queue>
-d, --domain <domain> Show information about a specific <domain>''')
g.add_argument('-q', '--queue', action='store', Metavar='', dest='queue',
help=argparse.SUPPRESS)
g.add_argument('-d', '--domain', action='store', Metavar='<domain>', dest='domain',
help=argparse.SUPPRESS)
parser.add_argument('-v', '--version', action='version', version='%(prog)s 0.1')
parser.print_help()
usage: pqa [-h] [-v,--version]
Postfix Queue Administration Tool
optional arguments:
-h, --help show this help message and exit
-l, --list Shows full overview of all queues
-v, --version show program's version number and exit
information options:
-q, --queue <queue> Show information for <queue>
-d, --domain <domain> Show information about a specific <domain>
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