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print(pd.merge(df1,df2,how="outer"))# 类似数据库的操作:inner、outer、left、right data1 key data200.0b1.011.0b1.026.0b1.032.0a0.044.0a0.055.0a0.063.0c NaN7NaN d2.0 1.1索引上的合并 left1= DataFrame({'key':['a','b','a','a','b','c'],\'data1':[ifor iinrange(6)]}) ...