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categorical column). train['Item_Weight'].fillna(train['Item_Weight'].mean(), inplace=True) test['Item_Weight'].fillna(train['Item_Weight'].mean(), 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