Set_defaults() methods with a specific set of name-value Generally, argument defaults are specified either by passing a default to The fromfile_prefix_chars= argument defaults to None, meaning thatĪrguments will never be treated as file references. Were in the same place as the original file referencing argument on the command parse_args () Namespace(f='bar')Īrguments read from a file must by default be one per line (but see alsoĬonvert_arg_line_to_args()) and are treated as if they ArgumentParser ( fromfile_prefix_chars = ) > parser. write ( '-f \n bar' ) > parser = argparse. (default: True)Įxit_on_error - Determines whether or not ArgumentParser exits withĮrror info when an error occurs. Which additional arguments should be read (default: None)Īrgument_default - The global default value for argumentsĬonflict_handler - The strategy for resolving conflicting optionalsĪdd_help - Add a -h/-help option to the parser (default: True)Īllow_abbrev - Allows long options to be abbreviated if theĪbbreviation is unambiguous. Prefix_chars - The set of characters that prefix optional argumentsįromfile_prefix_chars - The set of characters that prefix files from Parents - A list of ArgumentParser objects whose arguments shouldįormatter_class - A class for customizing the help output Usage - The string describing the program usage (default: generated fromĭescription - Text to display before the argument helpĮpilog - Text to display after the argument help (by default, no text) 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, exit_on_error = True ) ¶Ĭreate a new ArgumentParser object. In a script, parse_args() will typically be called with noĪrguments, and the ArgumentParser will automatically determine theĬommand-line arguments from sys.argv. parse_args () Namespace(accumulate=, integers=) The following code is a Python program that takes a list of integers and Int, float, argparse.FileType('w'), or callable function Indicate whether an argument is required or optionalĪutomatically convert an argument to the given type Specify the attribute name used in the result namespaceĪlternate display name for the argument as shown in help , range(1, 10), or Container instanceĭefault value used when an argument is not provided Limit values to a specific set of choices 'store', 'store_const', 'store_true', 'append', 'append_const', 'count', 'help', 'version' Specify how an argument should be handled verbose ) Quick Links for add_argument() ¶
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