Pandas DataFrame: use column value to slice string in another column

Question

I have a pandas DataFrame as follow:

     col1  col2  col3
0    1     3     ABCDEFG
1    1     5     HIJKLMNO
2    1     2     PQRSTUV

I wa

Answer 1

Use apply, because each row has to be process separately:

my_df['new_col'] = my_df.apply(lambda x: x['col3'][x['col1']-1:x['col2']], 1)  
print (my_df)
   col1  col2      col3 new_col
0     1     3   ABCDEFG     ABC
1     1     5  HIJKLMNO   HIJKL
2     1     2   PQRSTUV      PQ