Examples

import numpy as np
import pandas as pd

df = pd.DataFrame({'X': range(4), 'Y': range(2, 6)})
df

	X	Y
0	0	2
1	1	3
2	2	4
3	3	5

df.transform(lambda x: x + 1)

	X	Y
0	1	3
1	2	4
2	3	5
3	4	6

Even though the resulting DataFrame must have the same length as the input DataFrame,
it is possible to provide several input functions:

s = pd.Series(range(4))
s

0    0
1    1
2    2
3    3
dtype: int64

s.transform([np.sqrt, np.exp])

	sqrt	exp
0	0.000000	1.000000
1	1.000000	2.718282
2	1.414214	7.389056
3	1.732051	20.085537