Python Pandas add column for row-wise max value of selected columns [duplicate]

Answer 1

>>> frame['HighScore'] = frame[['test1','test2','test3']].max(axis=1)
>>> frame
    name  test1  test2  test3  HighScore
0   bill     85     35     51         85
1    joe     75     45     61         75
2  steve     85     83     45         85

Answer 2

>>> frame['HighScore'] = frame[['test1','test2','test3']].apply(max, axis=1)
>>> frame
    name  test1  test2  test3  HighScore
0   bill     85     35     51        85
1    joe     75     45     61        75
2  steve     85     83     45        85

Answer 3

if a max or min value between multiple columns in a df is to be determined then use:

df['Z']=df[['A','B','C']].apply(np.max,axis=1)