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    <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='&lt;modules/ports&gt;', 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 &lt;modules/ports&gt;] [-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 &lt;modules/ports&gt;] [-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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    1. USAntoine 'hashar' Musso
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    1. COThis is exactly what I was looking for! Thank you very much Bakuriu
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    2. CONesting groups like this works, but does not do anything significant. When an action is added to `group_simulate` it gets added to `root_group` as well. It is also added to `parser` and its `optional arguments` group. The net effect is that all 7 actions are mutually exclusive. Also the `usage` code does not handle nested groups. Note the `[[` and the lack of `|` between the nested groups.
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    3. COIt turns out that while `group_simulate` has a `container` attribute that points to the `root_group`, `root_group` does not have a list of its nested groups. There is a `_mutually_exclusive_groups` attribute, but this is shared (same reference) among the parser and all groups (exclusive or not). http://bugs.python.org/issue10984 has a patch with a formatter that can display overlapping exclusive groups - but it show's each group independently, not nested.
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