now I have this dataframe:
A B C
0 m 1 b
1 n 4 a
2 p 3 c
3 o 4 d
4 k 6 e
so,How I can get n,p,k in column。as follow:
A B C
0 n 4 a
1 p 3 c
2 k 6 e
thanks