在Gurobi Python中正确制定约束

import gurobipy as gp
from gurobipy import GRB

model = gp.Model("model_name")

x = model.addVar(lb=0, ub=1, vtype=GRB.CONTINUOUS, name="x")
y = model.addVar(lb=0, ub=1, vtype=GRB.CONTINUOUS, name="y")

model.setObjective(2*x + 3*y, GRB.MAXIMIZE)

model.addConstr(x + y <= 1, "c1")
model.addConstr(2*x - y >= 1, "c2")

model.optimize()

if model.status == GRB.OPTIMAL:
    print('Optimal objective value: %g' % model.objVal)
    for v in model.getVars():
        print('%s = %g' % (v.varName, v.x))
else:
    print('Optimization was stopped with status %d' % model.status)