Filter by single column

import numpy as np
import pandas as pd
df = pd.read_csv('abc.csv')
df.shape
(7, 5)
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
# We will get the students whoever passed science (considering 50 is the pass mark)

df_passed_science = df[df.science > 50]
df_passed_science
student language science maths history
0 kumar 90 56 34 34
3 janice 20 67 90 45
4 peter 30 56 45 65
6 carrol 50 90 45 23