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Pandas Series: combine_first() function

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)
Pandas Series: combine_first() function

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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