How to use the probscale.validate.axis_type function in probscale

if dist is None:
        dist = _minimal_norm

    # check input values
    fig, ax = validate.axes_object(ax)
    probax = validate.axis_name(probax, 'probability axis')
    problabel = validate.axis_label(problabel)
    datalabel = validate.axis_label(datalabel)

    # default values for symbology options
    scatter_kws = validate.other_options(scatter_kws)
    line_kws = validate.other_options(line_kws)
    pp_kws = validate.other_options(pp_kws)

    # check plottype
    plottype = validate.axis_type(plottype)

    # !-- kwarg that only seaborn should use --!
    _color = fgkwargs.get('color', None)
    if _color is not None:
        scatter_kws['color'] = _color
        line_kws['color'] = _color

    # !-- kwarg that only seaborn should use --!
    _label = fgkwargs.get('label', None)
    if _label is not None:
        scatter_kws['label'] = _label

    # !-- kwarg that only seaborn should use --!
    _marker = fgkwargs.get('marker', None)
    if _marker is not None:
        scatter_kws['marker'] = _marker