How to use the mc3.utils.parray function in mc3

def test_parray_none():
    assert mu.parray('None') is None

def test_parray_empty():
    np.testing.assert_equal(mu.parray(''), np.array([]))

def test_parray_numbers():
    np.testing.assert_equal(mu.parray('1 2 3'),
        np.array([1.0, 2.0, 3.0], np.double))

def test_parray_strings():
    assert mu.parray("a b\nc") == ["a", "b", "c"]

group.add_argument("--savefile", dest="savefile", action="store",
        type=str,  default=None,
        help="Output npz filename to store the parameter posterior "
             "distributions [default: %(default)s]")
    group.add_argument("-r", "--resume", dest="resume", action="store_true",
        default=False,
        help="If set, resume a previous run (load output).")
    group.add_argument("--rms",       dest="rms", action="store",
        type=eval, default=False,
        help="If True, calculate RMS-vs-binsize of data--bestmodel residuals "
             "[default: %(default)s]")
    group.add_argument("--log",       dest="log", action="store",
        type=str,  default=None,
        help="Output log filename.")
    group.add_argument("--pnames",   dest="pnames", action="store",
        type=mu.parray, default=None,
        help="List of parameter names for screen output (and figures if "
             "texnames is not defined).  If pnames is not defined, default "
             "to texnames.")
    group.add_argument("--texnames",    dest="texnames", action="store",
        type=mu.parray, default=None,
        help="List of parameter names for figures (may use latex syntax). "
             "[default: None]")
    # Fitting-parameter Options:
    group = parser.add_argument_group("Fitting-function Options")
    group.add_argument("--func",       dest="func", action="store",
        type=mu.parray, default=None,
        help="List of strings with the function name, module "
             "name, and path-to-module [required]")
    group.add_argument("--params",     dest="params", action="store",
        type=mu.parray, default=None,
        help="Filename or list of initial-guess model-fitting "

group.add_argument("--prior",    dest="prior", action="store",
        type=mu.parray,    default=None,
        help="Filename or array with parameter prior estimates "
             "[default: %(default)s]")
    group.add_argument("--priorlow", dest="priorlow", action="store",
        type=mu.parray,    default=None,
        help="Filename or array with prior lower uncertainties "
             "[default: %(default)s]")
    group.add_argument("--priorup",  dest="priorup", action="store",
        type=mu.parray,    default=None,
        help="Filename or array with prior upper uncertainties "
             "[default: %(default)s]")
    # Deprecated
    group = parser.add_argument_group("Deprecated Options")
    group.add_argument("--parname",   dest="parname", action="store",
        type=mu.parray, default=None,
        help="Deprecated, use pnames instead.")
    group.add_argument("--nproc",     dest="nproc",   action="store",
        type=int,  default=None,
        help="Deprecated, use ncpu instead.")
    group.add_argument("--stepsize",   dest="stepsize", action="store",
        type=mu.parray, default=None,
        help="Deprecated, use pstep instead.")
    group.add_argument("--chireturn", dest="chireturn", action="store",
        default=None, help="Deprecated.")
    group.add_argument("--full_output", dest="full_output", action="store",
        default=None, help="Deprecated.")
    group.add_argument("--lm", dest="lm", action="store",
        default=None, help='Deprecated. See leastsq new usage.')
    return parser