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index=["a","b","c"])print(df)# B first, then Aprint()df_=pd.DataFrame({"A": [7]},index=["b"])print(df.combine_first(df_))# A first, then Bprint()print(df_.combine_first(df))# A first, then Bprint()print(df_.combine_first(df)[df.columns])# Workaround...