如何在Julia中打印JuMP模型的约束值或结果

using Pkg
Pkg.add("JuMP")
Pkg.add("Gurobi")

using JuMP, Gurobi

model = Model(Gurobi.Optimizer)

@variable(model, x >= 0)
@variable(model, y >= 0)

@constraint(model, constraint1, x + y <= 10)
@constraint(model, constraint2, 2x + y >= 5)

optimize!(model)

println("Objective value: ", objective_value(model))
println("x value: ", value(x))
println("y value: ", value(y))
println("constraint1 value: ", JuMP.value(constraint1))
println("constraint2 value: ", JuMP.value(constraint2))