아미(아름다운미소)

import pandas as pddf1 = pd.DataFrame({'A': [1, 2], 'B': [3, 4]}, index=['x', 'y'])df2 = pd.DataFrame({'A': [5, 6], 'C': [7, 8]}, index=['x', 'y'])# Left join with drop=Falseresult = df1.join(df2.set_index('A', drop=False), how='left', # 명시적으로 left join 지정 lsuffix='_left', rsuffix='_right')print(result)