我有一个源自df.groupby().size()操作的DataFrame，看起来像这样:LocalizationRNAlevelcytoplasm1Non-expressed72Verylow133Low84Medium65Moderate86High27Veryhigh6cytoplasm&nucleus1Non-expressed52Verylow83Low24Medium105Moderate166High67Veryhigh5cytoplasm&nucleus&plasmamembrane1Non-expressed62Verylow33Low34Medium75Modera