Code:

# training data

house$\_$train$\_$y $=$ house$\_$train$[\text{'}$medv$\text{'}]$

house$\_$train$\_$x $=$ house$\_$train.drop$($labels $=[\text{'}$medv$\text{'}],$ axis $=1)$

lr $=$ LinearRegression$()$

lr$.$fit$($house$\_$train$\_$x$,$house$\_$train$\_$y$)$

how to fix key error medv $($test$)$

test data

house$\_$test$\_$y $=$ house$\_$test$[\text{'}$medv$\text{'}]$

house$\_$test$\_$x $=$ house$\_$test.drop$($labels $=[\text{'}$medv$\text{'}],$ axis $=1)$

lr$.$score$($house$\_$test$\_$x$,$ house$\_$test$\_$y$).$round$(3)$