def __init__(self, color=settings.SUBSET_COLORS[0], alpha=0.5, label=None, subset_state=None):
        """
        Create a new empty SubsetGroup

        Note: By convention, SubsetGroups should be created via
        DataCollection.new_subset.
        """
        self.subsets = []
        if subset_state is None:
            subset_state = SubsetState()

        self.subset_state = subset_state
        self.label = label
        self._style = None

        self.style = VisualAttributes(parent=self)
        self.style.markersize *= 2.5
        self.style.color = color
        self.style.alpha = alpha
dataset/ETHPy150Open glue-viz/glue/glue/core/subset_group.py/SubsetGroup.__init__/original