PYTHON 'Unicode' 对象不支持项赋值

Question

需要一些帮助来解决这个错误:

TypeError: 'unicode' 对象不支持项目分配

Ligne : menuDic[str(menu.id)]['menuDishes'][str(d.dish.dishType.name)]['dishTypeName'][str(d.dish. id)] = {}

def getDishOfTheWeek():
    menuDic = Ddict(dict)
    for menu in Menus.select().where(state = True):
        menuDic[str(menu.id)]={}
        menuDic[str(menu.id)]['menuId']=menu.id
        menuDic[str(menu.id)]['menuName']=menu.name
        menuDic[str(menu.id)]['menuCountry']=menu.country.name
        menuDic[str(menu.id)]['menuDishes']={}
        for d in DishMenuRels.select().where(menu = menu.id).join(Dishes).join(DishTypes).order_by('name')
            menuDic[str(menu.id)]['menuDishes'][str(d.dish.dishType.name)] = {}
            menuDic[str(menu.id)]['menuDishes'][str(d.dish.dishType.name)]['dishTypeName'] = d.dish.dishType.name
            menuDic[str(menu.id)]['menuDishes'][str(d.dish.dishType.name)]['dishTypeName'][str(d.dish.id)] = {}
            menuDic[str(menu.id)]['menuDishes'][str(d.dish.dishType.name)]['dishTypeName'][str(d.dish.id)]['dishId'] = d.dish.id
            menuDic[str(menu.id)]['menuDishes'][str(d.dish.dishType.name)]['dishTypeName'][str(d.dish.id)]['dishState'] = d.dish.name
            menuDic[str(menu.id)]['menuDishes'][str(d.dish.dishType.name)]['dishTypeName'][str(d.dish.id)]['dishType'] = d.dish.price
            menuDic[str(menu.id)]['menuDishes'][str(d.dish.dishType.name)]['dishTypeName'][str(d.dish.id)]['dishName'] = d.dish.country.name
    print json.dumps(menuDic, indent=5, sort_keys=True)

谢谢

Answer 1

在这里，您将值 d.dish.dishType.name(看起来是一个 unicode 字符串)分配给字典键 'dishTypeName'。

        menuDic[str(menu.id)]['menuDishes'][str(d.dish.dishType.name)]\
               ['dishTypeName'] = d.dish.dishType.name

然后，您对该值使用项目分配；以下与 d.dish.dishType.name[str(d.dish.id)] = {} 相同。

        menuDic[str(menu.id)]['menuDishes'][str(d.dish.dishType.name)]\
               ['dishTypeName'][str(d.dish.id)] = {}

不用说，这会导致错误，因为 d.dish.dishType.name 是一个不可变的字符串。

我可以补充一点，您最好将这些作业分解成更小的部分，也许只有几个功能？这些长赋值语句——我相信您已经注意到了——很难解释和调试。