Sum as a new column

import numpy as np
import pandas as pd
df = pd.read_csv('abc.csv')
df
student language science maths history
0 kumar 90 56 34 34
1 kevin 10 34 32 67
2 sammy 90 23 12 32
3 janice 20 67 90 45
4 peter 30 56 45 65
5 prem 90 45 45 34
6 carrol 50 90 45 23 
df['total'] = df.sum()
df
student language science maths history total
0 kumar 90 56 34 34 NaN
1 kevin 10 34 32 67 NaN
2 sammy 90 23 12 32 NaN
3 janice 20 67 90 45 NaN
4 peter 30 56 45 65 NaN
5 prem 90 45 45 34 NaN
6 carrol 50 90 45 23 NaN
Note

The total coulmn shows NaN. This is because of missing axis.

df['total'] = df.sum(axis=1)
df
student language science maths history total
0 kumar 90 56 34 34 428
1 kevin 10 34 32 67 286
2 sammy 90 23 12 32 314
3 janice 20 67 90 45 444
4 peter 30 56 45 65 392
5 prem 90 45 45 34 428
6 carrol 50 90 45 23 416