fillna() method to fill the null values code example

Example 1: python pandas replace nan with null

df.fillna('', inplace=True)

Example 2: DataFrame.fillna

>>> df.fillna(0)
    A   B   C   D
0   0.0 2.0 0.0 0
1   3.0 4.0 0.0 1
2   0.0 0.0 0.0 5
3   0.0 3.0 0.0 4