Can I use my helper function to determine if a shot was a three pointer as a filter function in Pandas? My actual function is much more complex, but i simplified it for this question.

def isThree(x, y):return (x + y == 3)print data[isThree(data['x'], data['y'])].head()

Yes:

import numpy as np
import pandas as pddata = pd.DataFrame({'x': np.random.randint(1,3,10),'y': np.random.randint(1,3,10)})
print(data)

Output:

   x  y
0  1  2
1  2  1
2  2  1
3  1  2
4  2  1
5  2  1
6  2  1
7  2  1
8  2  1
9  2  2

def isThree(x, y):return (x + y == 3)print(data[isThree(data['x'], data['y'])].head())

Output:

   x  y
0  1  2
1  2  1
2  2  1
3  1  2
4  2  1