df_high = df_all[['model_cd', 'modelname', 'installcost','yearlyupkeep', 'Efficiency']][df_all['Efficiency']==High] high_efficiency_model = df_high[['model_cd', 'modelname','installcost', 'yearlyupkeep','Efficiency']].groupby('Efficiency') high_efficiency_model.to_csv(index = True) keep getting an

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