Python 使用 pyomo 不同的 bin 大小

我是pyomo的新手.我想问一下，是否有办法达到这一要求.

1. 我希望我的assets资源 被分配到5个不同的箱子.每个箱子将具有最大容量.例如，y1最大值为50，y2最大值为20，..
2. 我的一些assets资源 只能放在特定的箱子里.例如，A只能转到y1、y2.B可以转到y4和y5.

目前我的代码如下所示，但它没有产生正确的结果.分配的某些项目可能超过容量.

from pyomo.opt import SolverFactory
value_asset = {'J': 2, 'B': 4, 'D': 18, 'C': 34, 'A': 20, 'E': 31}
bins = {'y1': 50, 'y2': 20, 'y3': 30, 'y4': 70, 'y5': 40}
Assets = {'A': ['y1', 'y2'], 'J': ['y1', 'y2'], 'E': ["y4", "y5"], 'B': ["y4", "y5"],
          'D': ['y5', "y4", "y3"],
          'C': ["y1", "y2", 'y3', 'y4', 'y5']}
model = pyo.ConcreteModel()

model.Assets = pyo.Set(initialize=Assets.keys())

model.budget = pyo.Set(initialize=bins.keys())
model.x = pyo.Var(model.Assets, model.budget, within=pyo.Integers, bounds=(0, None))
model.less_budget = pyo.ConstraintList()

# make sure that all the total are always less than or equal to the budget
for b in model.budget:
    model.less_budget.add(expr=sum([model.x[asset, b] for asset in model.Assets]) <= bins[b])

# we want to exclude certain year that some assets cannot do

model.excluded = pyo.ConstraintList()

for asset in model.Assets:
    inc = Assets[asset]
    exc = list(bins.keys() - inc)
    for t in exc:
        model.excluded.add(expr=model.x[asset, t] == 0)

# each item can only go to 1 bin
model.one_bins = pyo.ConstraintList()

for asset in model.Assets:
    model.one_bins.add(expr=sum(model.x[asset, b] for b in (model.budget )) <= 1)
        
model.obj = pyo.Objective(expr=sum(model.x[asset, b] for asset in model.Assets for b in model.budget),sense=pyo.maximize)


solver = pyo.SolverFactory('cbc', executable=r'C:\Users\cc\Downloads\Cbc-2.10-win64-msvc15-md\bin\cbc.exe')
solver.solve(model)

model.x.display()