Class ArgumentError

Lib/argparse.py:860–877

An error from creating or using an argument (optional or positional). The string value of this exception is the message, augmented with information about the argument that caused it.

class ArgumentError(Exception):
    """An error from creating or using an argument (optional or positional).

    The string value of this exception is the message, augmented with
    information about the argument that caused it.
    """

    def __init__(self, argument, message):
        self.argument_name = _get_action_name(argument)
        self.message = message

    def __str__(self):
        if self.argument_name is None:
            format = '%(message)s'
        else:
            format = _('argument %(argument_name)s: %(message)s')
        return format % dict(message=self.message,
                             argument_name=self.argument_name)


class ArgumentTypeError(Exception):