wps如何去除重复的数据,怎样筛选出重复的数据

import pandas as pddata={'demo':[1,1,2,2,1,2,2,3,4,5,6,98,4,2,4,5,2,5,6,7]}df=pd.DataFrame(data)a=df.drop_duplicates(subset=['demo'],keep='first')print(a)