PuLP - constraint实现中的字典复制

from pulp import *

# 创建问题实例
problem = LpProblem("Example", LpMinimize)

# 创建变量
x = LpVariable("x", lowBound=0)
y = LpVariable("y", lowBound=0)

# 创建系数字典
coefficients = {"x": 2, "y": 3}

# 复制系数字典
coefficients_copy = coefficients.copy()

# 定义第一个约束条件
constraint1 = LpConstraint(e=LpAffineExpression(coefficients_copy), sense=LpConstraintLE, rhs=10)
problem.addConstraint(constraint1)

# 修改系数字典副本
coefficients_copy["x"] = 1
coefficients_copy["y"] = 2

# 定义第二个约束条件
constraint2 = LpConstraint(e=LpAffineExpression(coefficients_copy), sense=LpConstraintGE, rhs=5)
problem.addConstraint(constraint2)

# 求解问题
problem.solve()

# 输出结果
print("x =", value(x))
print("y =", value(y))