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pandas.Series.combine_first

Series.combine_first(other)[source]

Combine Series values, choosing the calling Series’s values first. Result index will be the union of the two indexes

Parameters:other : Series
Returns:combined : Series

See also

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

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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