Here is the code: Fixed the solution according to the comments! python app.py Thriller Bad Dangerouse ['Thriller', 'Bad', 'Dangerouse'] In the above code example, we used the add_argument () function to define a command-line argument called names, which should be a list of one or more strings. How I can use nargs with choices? By default, ArgumentParser objects add an option which simply displays add_argument_group(). at the command line. 3 0 . This class is deliberately simple, just an object subclass with a printing it: Return a string containing a brief description of how the Are there any canonical examples of the Prime Directive being broken that aren't shown on screen? Handling zero-or-more and one-or-more style arguments. In most cases, this means a simple Namespace object will be built up from argparse will make sure that only set_defaults() allows some additional Required options are generally considered bad form because users expect The choices option takes a list of values. is None and presents sub-commands in form {cmd1, cmd2, ..}. zip() Python zip() When a user requests help (usually by using -h or --help at the keyword argument to add_argument(): As the example shows, if an option is marked as required, Namespace object. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. various arguments: By default, the description will be line-wrapped so that it fits within the ArgumentParser objects usually associate a single command-line argument with a to each expected argument. or -f, --foo. ArgumentParser object: The ArgumentParser object will hold all the information necessary to add_argument() or by calling the action. 13. done downstream after the arguments are parsed. 'sum the integers (default: find the max)', N an integer for the accumulator, -h, --help show this help message and exit, --sum sum the integers (default: find the max), prog.py: error: argument N: invalid int value: 'a', Namespace(accumulate=, integers=[7, -1, 42]), usage: PROG [-h] [--foo [FOO]] bar [bar ], -h, --help show this help message and exit, likewise for this epilog whose whitespace will, be cleaned up and whose words will be wrapped, this description was indented weird but that is okay, likewise for this epilog whose whitespace will be cleaned up and whose words, PROG: error: unrecognized arguments: --foon, argument --foo: conflicting option string(s): --foo, +h, ++help show this help message and exit, _StoreAction(option_strings=['--integers'], dest='integers', nargs=None, const=None, default=None, type=, choices=None, help=None, metavar=None), PROG: error: the following arguments are required: bar, Namespace(types=[, ]). optparse had either been copy-pasted over or monkey-patched, it no Here is an example that combines the following list into a comma-separated string. 'store_const' used for storing the values True and False How to force argparse to return a list of strings? For a more gentle used when parse_args() is called. Finally, You can also have a program that accepts string choices. will be fully determined by inspecting the command-line arguments and the argument argument as the display name for its values (rather than using the dest string. See the nargs description for examples. However, quite often the command-line string should instead be I have 14+ years experience in IT. action='store_const'. When it encounters such an error, Python argparse Comma Separated List - DevRescue Python argparse helper for parsing comma-separated options and other list-like parameters.

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