pandas.DataFrame.combine_first

DataFrame.combine_first(other) [source]

Combine two DataFrame objects and default to non-null values in frame calling the method. Result index columns will be the union of the respective indexes and columns

Parameters:	other : DataFrame
Returns:	combined : DataFrame

See also

DataFrame.combine

Perform series-wise operation on two DataFrames using a given function

Examples

df1’s values prioritized, use values from df2 to fill holes:

>>> df1 = pd.DataFrame([[1, np.nan]])
>>> df2 = pd.DataFrame([[3, 4]])
>>> df1.combine_first(df2)
   0    1
0  1  4.0