apply transformation to column pandas code example

Example 1: pandas apply function to column

df['a'] = df['a'].apply(lambda x: x + 1)

Example 2: pandas transform

>>> df = pd.DataFrame({'A': range(3), 'B': range(1, 4)})
>>> df
   A  B
0  0  1
1  1  2
2  2  3
>>> df.transform(lambda x: x + 1)
   A  B
0  1  2
1  2  3
2  3  4