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fillna() with Pandas Series

Explore how to use the fillna() method with Pandas Series to replace missing data while understanding when it returns a new object versus modifying inplace. Learn about handling various missing value types and the rationale behind the method's design.

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Try it yourself

Try executing the code below to see the result.

Python 3.8
import numpy as np
import pandas as pd
s = pd.Series([1, 2, np.nan, 4, 5])
s.fillna(3)
print(s.sum())

Explanation

The pandas.Series.fillna documentation says, that it returns the following:

"Returns: Series or None

Object with missing values ...