concatenate、merge与join

concatenate 举例一： df1= pd.DataFrame({'A':['A0','A1','A2','A3'], 'B':['B0','B1','B2','B3'], 'C':['C0','C1','C2','C3'], 'D':['D0','D1','D2','D3']}, index=[0,1,2,3]) df2 = pd.DataFrame({'A': ['A4', '

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