Python数据分析库pandas ------ GroupBy数据聚合、等级分组、组迭代、链式转换、

数据聚合(GroupBy) 1 frame10 = pd.DataFrame({ 2 'color': ['white','red','green','red','green'], 3 'object': ['pen','pencil','pencil','ashtray','pen'], 4 'price1' : [5.56,4.20,1.30,0.56,2.75], 5 'price2' :

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