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When using an argument (optional and positional both have this problem) with the keyword choices, the generated help output shows those choices.
If that same argument also includes a metavar keyword, the list of choices is omitted from the generated output.
What I had in mind, was to show the metavar in the usage line, but actually show the available choices when the 'autohelp' lists positional/optional argument details.
Any simple fixes/workarounds?
I have already started an argparse wrapper for custom help functionality. Perhaps this should be another feature on my TODO list.
302
Metavar: It provides a different name for optional argument in help messages. Provide a value for the metavar keyword argument within add_argument() .
To add an optional argument, simply omit the required parameter in add_argument() . args = parser. parse_args()if args.
The argparse module makes it easy to write user-friendly command-line interfaces. It parses the defined arguments from the sys. argv . The argparse module also automatically generates help and usage messages, and issues errors when users give the program invalid arguments.
The add_argument() method action - The basic type of action to be taken when this argument is encountered at the command line. nargs - The number of command-line arguments that should be consumed. const - A constant value required by some action and nargs selections.
You can add the choices to the help text.
parser=argparse.ArgumentParser()
parser.add_argument('-f',metavar="TEST",choices=('a','b','c'),
help='choices, {%(choices)s}')
print parser.format_help()
produces:
usage: stack20328931.py [-h] [-f TEST]
optional arguments:
-h, --help show this help message and exit
-f TEST choices, {a, b, c}
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