Using argparse, how do I specify that I want two positional arguments to appear together or not at all? I.e. I want my usage string to look like:
Usage: FooBar.py [-h] [FOO BAR]
Using argparse, how do I specify that I want two positional arguments to appear together or not at all? I.e. I want my usage string to look like:
Usage: FooBar.py [-h] [FOO BAR]
As suggested by @hpaulj, here's a solution you could use:
In [1]: import argparse
In [2]: parser = argparse.ArgumentParser(description="bla bla")
In [3]: parser.add_argument("--foo", nargs=2, help="a foo argument")
In [4]: parser.parse_args(["--foo", "1", "2"])
Out[4]: Namespace(foo=['1', '2'])
In [5]: parser.parse_args([])
Out[5]: Namespace(foo=None)
In [6]: parser.print_help()
usage: ipython [-h] [--foo FOO FOO]
bla bla
optional arguments:
-h, --help show this help message and exit
--foo FOO FOO a foo argument