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# pandas.Series.combine_first¶

Series.combine_first(self, other)[source]

Combine Series values, choosing the calling Series’s values first.

Parameters: other : Series The value(s) to be combined with the Series. Series The result of combining the Series with the other object.

Series.combine
Perform elementwise operation on two Series using a given function.

Notes

Result index will be the union of the two indexes.

Examples

>>> s1 = pd.Series([1, np.nan])
>>> s2 = pd.Series([3, 4])
>>> s1.combine_first(s2)
0    1.0
1    4.0
dtype: float64

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