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#Argparse python 3 install plus

parse_args () Namespace(foo=None, one='X') > # negative number options present, so -2 is an option > parser. add_argument ( 'foo', nargs = '?' ) > # negative number options present, so -1 is an option > parser. add_argument ( '-1', dest = 'one' ) > parser. ArgumentParser ( prog = 'PROG' ) > parser. parse_args () Namespace(foo='-5', x='-1') > parser = argparse. parse_args () Namespace(foo=None, x='-1') > # no negative number options, so -1 and -5 are positional arguments > parser. add_argument ( 'foo', nargs = '?' ) > # no negative number options, so -1 is a positional argument > parser. The _call_ method may perform arbitrary actions, but will typically setĪttributes on the namespace based on dest and values. Is associated with a positional argument. The option_string argument is optional, and will be absent if the action

option_string - The option string that was used to invoke this action.

Type conversions are specified with the type keyword argument to

values - The associated command-line arguments, with any type conversionsĪpplied.

namespace - The Namespace object that will be returned by.

parser - The ArgumentParser object which contains this action.

_call_ method, which should accept four parameters: The easiest way to ensure these attributesĪction instances should be callable, so subclasses must override the Parameter) should have attributes “dest”, “option_strings”, “default”, “type”, Instances of Action (or return value of any callable to the action

#Argparse python 3 install plus

Plus any keyword arguments passed to ArgumentParser.add_argument() The Action class must accept the two positional arguments Needed to parse a single argument from one or more strings from theĬommand line. Action ( option_strings, dest, nargs=None, const=None, default=None, type=None, choices=None, required=False, help=None, metavar=None )Īction objects are used by an ArgumentParser to represent the information This API may be passed as the action parameter toĪdd_argument(). Which processes arguments from the command-line. The following sections describe how each of these are used.Īction classes implement the Action API, a callable which returns a callable dest - The name of the attribute to be added to the object returned by.metavar - A name for the argument in usage messages.help - A brief description of what the argument does.

required - Whether or not the command-line option may be omitted.

choices - A container of the allowable values for the argument.

type - The type to which the command-line argument should be converted.

default - The value produced if the argument is absent from the.

const - A constant value required by some action and nargs selections.

nargs - The number of command-line arguments that should be consumed.

action - The basic type of action to be taken when this argument is.

name or flags - Either a name or a list of option strings, e.g.

Has its own more detailed description below, but in short they are: )ĭefine how a single command-line argument should be parsed. The add_argument() method ArgumentParser.

allow_abbrev - Allows long options to be abbreviated if theĪbbreviation is unambiguous.

add_help - Add a -h/-help option to the parser (default: True).

conflict_handler - The strategy for resolving conflicting optionals.

argument_default - The global default value for arguments.Which additional arguments should be read (default: None) fromfile_prefix_chars - The set of characters that prefix files from.prefix_chars - The set of characters that prefix optional arguments.formatter_class - A class for customizing the help output.parents - A list of ArgumentParser objects whose arguments should.epilog - Text to display after the argument help (default: none).description - Text to display before the argument help (default: none).usage - The string describing the program usage (default: generated from.prog - The name of the program (default: sys.argv).

Each parameter has its own more detailed description All parameters should be passedĪs keyword arguments. ArgumentParser ( prog=None, usage=None, description=None, epilog=None, parents=, formatter_class=argparse.HelpFormatter, prefix_chars='-', fromfile_prefix_chars=None, argument_default=None, conflict_handler='error', add_help=True, allow_abbrev=True )Ĭreate a new ArgumentParser object.