A.sort()B.order()C.sort_values()D.sort_index()
A.dropna()B.fillna()C.isnan()D.isnull()
A.布爾型數(shù)據(jù)B.日期和時間數(shù)據(jù)C.浮點(diǎn)數(shù)數(shù)據(jù)D.分類數(shù)據(jù)