Pandas Series: combine_first() function

Last update on September 15 2022 12:58:10 (UTC/GMT +8 hours)

Combine Series values in Pandas

The combine_first() function is used to combine Series values, choosing the calling Series’s values first.

Syntax:

Series.combine_first(self, other)

Parameters:

Name	Description	Type/Default Value	Required / Optional
other	The value(s) to be combined with the Series.	Series	Required

Returns: Series
The result of combining the Series with the other object

Example:

Python-Pandas Code:

import numpy as np
import pandas as pd
s1 = pd.Series([2, np.nan])
s2 = pd.Series([4, 5])
s1.combine_first(s2)

Output:

0    2.0
1    5.0
dtype: float64

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