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copied!<p>You can use a common mutually-exclusive-group as "root" of the two subgroups:</p> <pre class="lang-python prettyprint-override"><code>import argparse parser = argparse.ArgumentParser( description='this is the description', epilog="This is the epilog", argument_default=argparse.SUPPRESS ) parser.add_argument('-v', '--verbose', help='verbose', action='store_true', default=False) root_group = parser.add_mutually_exclusive_group() group_list = root_group.add_mutually_exclusive_group() group_list.add_argument('-m', help='list only modules', action='store_const', dest='list', const='modules', default='all') group_list.add_argument('-p', help='list only ports', action='store_const', dest='list', const='ports', default='all') group_list.add_argument('--list', help='list only module or ports', choices=['modules','ports'], metavar='<modules/ports>', default='all') group_simulate = root_group.add_mutually_exclusive_group() group_simulate.add_argument('-M', help='simulate module down', nargs=1, metavar='module_name', dest='simulate') group_simulate.add_argument('-P', help='simulate FC port down', nargs=1, metavar='fc_port_name', dest='simulate') group_simulate.add_argument('-I', help='simulate iSCSI port down', nargs=1, metavar='iSCSI_port_name', dest='simulate') group_simulate.add_argument('--simulate', help='simulate module or port down', nargs=1, dest='simulate') args = parser.parse_args() print args </code></pre> <p>Result:</p> <pre><code>$ python test.py -m -P asfafs usage: test.py [-h] [-v] [[-m | -p | --list <modules/ports>] [-M module_name | -P fc_port_name | -I iSCSI_port_name | --simulate SIMULATE] test.py: error: argument -P: not allowed with argument -m $ python test.py -m -p usage: test.py [-h] [-v] [[-m | -p | --list <modules/ports>] [-M module_name | -P fc_port_name | -I iSCSI_port_name | --simulate SIMULATE] test.py: error: argument -p: not allowed with argument -m </code></pre>

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