dataframe fill na code example

Example 1: pandas fill na with value from another column

df['Cat1'].fillna(df['Cat2'])

Example 2: pandas replace nan

data["Gender"].fillna("No Gender", inplace = True)

Example 3: python pandas replace nan with null

df.fillna('', inplace=True)

Example 4: 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