ArgumentParser.add_mutually_exclusive_group(required=False)
Create a mutually exclusive group. argparse
will make sure that only one of the arguments in the mutually exclusive group was present on the command line:
>>> parser = argparse.ArgumentParser(prog='PROG') >>> group = parser.add_mutually_exclusive_group() >>> group.add_argument('--foo', action='store_true') >>> group.add_argument('--bar', action='store_false') >>> parser.parse_args(['--foo']) Namespace(bar=True, foo=True) >>> parser.parse_args(['--bar']) Namespace(bar=False, foo=False) >>> parser.parse_args(['--foo', '--bar']) usage: PROG [-h] [--foo | --bar] PROG: error: argument --bar: not allowed with argument --foo
The add_mutually_exclusive_group()
method also accepts a required argument, to indicate that at least one of the mutually exclusive arguments is required:
>>> parser = argparse.ArgumentParser(prog='PROG') >>> group = parser.add_mutually_exclusive_group(required=True) >>> group.add_argument('--foo', action='store_true') >>> group.add_argument('--bar', action='store_false') >>> parser.parse_args([]) usage: PROG [-h] (--foo | --bar) PROG: error: one of the arguments --foo --bar is required
Note that currently mutually exclusive argument groups do not support the title and description arguments of add_argument_group()
.
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