How to use the fire.formatting.Underline function in fire

def _NewChoicesSection(name, choices):
  return _CreateItem(
      '{name} is one of the following:'.format(
          name=formatting.Bold(formatting.Underline(name))),
      '\n' + '\n\n'.join(choices),
      indent=1)

"""
  args_with_no_defaults = spec.args[:len(spec.args) - len(spec.defaults)]
  args_with_defaults = spec.args[len(spec.args) - len(spec.defaults):]

  # Check if positional args are allowed. If not, require flag syntax for args.
  accepts_positional_args = metadata.get(decorators.ACCEPTS_POSITIONAL_ARGS)

  arg_and_flag_strings = []
  if args_with_no_defaults:
    if accepts_positional_args:
      arg_strings = [formatting.Underline(arg.upper())
                     for arg in args_with_no_defaults]
    else:
      arg_strings = [
          '--{arg}={arg_upper}'.format(
              arg=arg, arg_upper=formatting.Underline(arg.upper()))
          for arg in args_with_no_defaults]
    arg_and_flag_strings.extend(arg_strings)

  # If there are any arguments that are treated as flags:
  if args_with_defaults or spec.kwonlyargs or spec.varkw:
    arg_and_flag_strings.append('')

  if spec.varargs:
    varargs_string = '[{varargs}]...'.format(
        varargs=formatting.Underline(spec.varargs.upper()))
    arg_and_flag_strings.append(varargs_string)

  return ' '.join(arg_and_flag_strings)

def _GetPossibleActionsString(possible_actions):
  """A help screen string listing the possible action kinds available."""
  return ' | '.join(formatting.Underline(action.upper())
                    for action in possible_actions)