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test['Outlet_Size'].fillna(train['Outlet_Size'].mode()[0], inplace=True) train.isnull().sum() """ OUTPUT: Item_Identifier 0 Item_Weight 0 Item_Fat_Content 0 Item_Visibility 0 Item_Type 0 Item_MRP 0 Outlet_Identifier 0 Outlet_Establishment_Year 0 Outlet_Size 0 Outlet_Location_Type 0 Outlet_Type 0