This is the best argparse tutorial I ever seen.
We need to check the add_argument() method in ArgumentParser.add_argument():
ArgumentParser.add_argument(name or flags...[, action][, nargs][, const][, default][, type][, choices][, required][, help][, metavar][, dest])- name or flags — Either a name or a list of option strings, e.g. foo or -f, — foo.
- 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.
- default — The value produced if the argument is absent from the command line.
- type — The type to which the command-line argument should be converted.
- choices — A container of the allowable values for the argument.
- required — Whether or not the command-line option may be omitted (optionals only).
- help — A brief description of what the argument does.
- metavar — A name for the argument in usage messages.
- dest — The name of the attribute to be added to the object returned by parse_args().