> import pandas as pd 
> data={'state':[1,1,2,2],'pop':['a','b','c','d']} 
> frame=pd.DataFrame(data) 
> frame 
 pop state 
0 a  1 
1 b  1 
2 c  2 
3 d  2 
> IsDuplicated=frame.duplicated() 
> print IsDuplicated 
0 False 
1 False 
2 False 
3 False 
dtype: bool 
> frame=frame.drop_duplicates(['state']) 
> frame 
 pop state 
0 a  1 
2 c  2 
> IsDuplicated=frame.duplicated(['state']) 
> print IsDuplicated 
0 False 
2 False 
dtype: bool 
>