Python: Pandas - Delete the first row by group

Question

I have the following large dataframe (df) that looks like this:

    ID     date        PRICE       
1   10001  19920103  14.500    
2   10001  1         


        

Answer 1

Another one line code is df.groupby('ID').apply(lambda group: group.iloc[1:, 1:])

Out[100]: 
             date  PRICE
ID                      
10001 2  19920106   14.5
      3  19920107   14.5
10002 5  19920109   14.5
      6  19920110   14.5
10003 8  19920114   14.5
      9  19920115   15.0