PYTHON 'Unicode'对象不支持项分配

Question

需要一些帮助，请解决此错误：

类型错误："unicode"对象不支持项分配

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 （这似乎是一个 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，对该值使用项目分配;以下内容与 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是不可变的字符串。

我可以补充一点，你最好将这些作业分成更小的部分，也许有几个功能？这些长赋值语句 - 我相信你已经注意到了 - 很难解释和调试。