@property
def groupings(self) -> list[grouper.Grouping]:
    lev = self.binlabels
    ping = grouper.Grouping(lev, lev, in_axis=False, level=None)
    return [ping]
@property
def groupings(self) -> list[grouper.Grouping]:
    lev = self.binlabels
    ping = grouper.Grouping(lev, lev, in_axis=False, level=None)
    return [ping]